sass-site/source/documentation/modules/color.liquid

---
title: sass:color
---

{% render 'doc_snippets/built-in-module-status' %}

{% capture color_adjust %}
  color.adjust($color,
    $red: null, $green: null, $blue: null,
    $hue: null, $saturation: null, $lightness: null,
    $whiteness: null, $blackness: null,
    $alpha: null)
{% endcapture %}

{% function color_adjust, 'adjust-color(...)', 'returns:color' %}
  {% compatibility 'dart: "1.28.0"', 'libsass: false', 'ruby: false', 'feature: "$whiteness and $blackness"' %}{% endcompatibility %}

  {% markdown %}
    Increases or decreases one or more properties of `$color` by fixed amounts.

    Adds the value passed for each keyword argument to the corresponding
    property of the color, and returns the adjusted color. It's an error to
    specify an RGB property (`$red`, `$green`, and/or `$blue`) at the same time
    as an HSL property (`$hue`, `$saturation`, and/or `$lightness`), or either
    of those at the same time as an [HWB][] property (`$hue`, `$whiteness`,
    and/or `$blackness`).

    [HWB]: https://en.wikipedia.org/wiki/HWB_color_model

    All optional arguments must be numbers. The `$red`, `$green`, and `$blue`
    arguments must be [unitless][] and between -255 and 255 (inclusive). The
    `$hue` argument must have either the unit `deg` or no unit. The
    `$saturation`, `$lightness`, `$whiteness`, and `$blackness` arguments must
    be between `-100%` and `100%` (inclusive), and may not be unitless. The
    `$alpha` argument must be unitless and between -1 and 1 (inclusive).

    [unitless]: /documentation/values/numbers#units

    See also:

    * [`color.scale()`](#scale) for fluidly scaling a color's properties.
    * [`color.change()`](#change) for setting a color's properties.
  {% endmarkdown %}

  {% codeExample 'adjust-color', false %}
    @debug color.adjust(#6b717f, $red: 15); // #7a717f
    @debug color.adjust(#d2e1dd, $red: -10, $blue: 10); // #c8e1e7
    @debug color.adjust(#998099, $lightness: -30%, $alpha: -0.4); // rgba(71, 57, 71, 0.6)
    ===
    @debug color.adjust(#6b717f, $red: 15)  // #7a717f
    @debug color.adjust(#d2e1dd, $red: -10, $blue: 10)  // #c8e1e7
    @debug color.adjust(#998099, $lightness: -30%, $alpha: -0.4)  // rgba(71, 57, 71, 0.6)
  {% endcodeExample %}
{% endfunction %}

{% function 'adjust-hue($color, $degrees)', 'returns:color' %}
  {% markdown %}
    Increases or decreases `$color`'s hue.

    The `$hue` must be a number between `-360deg` and `360deg` (inclusive) to
    add to `$color`'s hue. It may be [unitless][] but it may not have any unit
    other than `deg`.

    [unitless]: /documentation/values/numbers#units

    See also [`color.adjust()`](#adjust), which can adjust any property of a
    color.
  {% endmarkdown %}

  {% headsUp %}
    Because `adjust-hue()` is redundant with [`adjust()`](#adjust), it's not
    included directly in the new module system. Instead of `adjust-hue($color,
    $amount)`, you can write [`color.adjust($color, $hue: $amount)`](#adjust).
  {% endheadsUp %}

  {% codeExample 'adjust-hue', false %}
    // Hue 222deg becomes 282deg.
    @debug adjust-hue(#6b717f, 60deg); // #796b7f

    // Hue 164deg becomes 104deg.
    @debug adjust-hue(#d2e1dd, -60deg); // #d6e1d2

    // Hue 210deg becomes 255deg.
    @debug adjust-hue(#036, 45); // #1a0066
    ===
    // Hue 222deg becomes 282deg.
    @debug adjust-hue(#6b717f, 60deg)  // #796b7f

    // Hue 164deg becomes 104deg.
    @debug adjust-hue(#d2e1dd, -60deg)  // #d6e1d2

    // Hue 210deg becomes 255deg.
    @debug adjust-hue(#036, 45)  // #1a0066
  {% endcodeExample %}
{% endfunction %}

{% function 'color.alpha($color)', 'alpha($color)', 'opacity($color)', 'returns:number' %}
  {% markdown %}
    Returns the alpha channel of `$color` as a number between 0 and 1.

    As a special case, this supports the Internet Explorer syntax
    `alpha(opacity=20)`, for which it returns an [unquoted string][].

    [unquoted string]: /documentation/values/strings#unquoted

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.blue()`](#blue) for getting a color's blue channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
  {% endmarkdown %}

  {% codeExample 'color-alpha', false %}
    @debug color.alpha(#e1d7d2); // 1
    @debug color.opacity(rgb(210, 225, 221, 0.4)); // 0.4
    @debug alpha(opacity=20); // alpha(opacity=20)
    ===
    @debug color.alpha(#e1d7d2)  // 1
    @debug color.opacity(rgb(210, 225, 221, 0.4))  // 0.4
    @debug alpha(opacity=20)  // alpha(opacity=20)
  {% endcodeExample %}
{% endfunction %}

{% function 'color.blackness($color)', 'returns:number' %}
  {% compatibility 'dart: "1.28.0"', 'libsass: false', 'ruby: false' %}{% endcompatibility %}

  {% markdown %}
    Returns the [HWB][] blackness of `$color` as a number between `0%` and
    `100%`.

    [HWB]: https://en.wikipedia.org/wiki/HWB_color_model

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-blackness', false %}
    @debug color.blackness(#e1d7d2); // 11.7647058824%
    @debug color.blackness(white); // 0%
    @debug color.blackness(black); // 100%
    ===
    @debug color.blackness(#e1d7d2)  // 11.7647058824%
    @debug color.blackness(white)  // 0%
    @debug color.blackness(black)  // 100%
  {% endcodeExample %}
{% endfunction %}

{% function 'color.blue($color)', 'blue($color)', 'returns:number' %}
  {% markdown %}
    Returns the blue channel of `$color` as a number between 0 and 255.

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-blue', false %}
    @debug color.blue(#e1d7d2); // 210
    @debug color.blue(white); // 255
    @debug color.blue(black); // 0
    ===
    @debug color.blue(#e1d7d2)  // 210
    @debug color.blue(white)  // 255
    @debug color.blue(black)  // 0
  {% endcodeExample %}
{% endfunction %}

{% capture color_change %}
  color.change($color,
    $red: null, $green: null, $blue: null,
    $hue: null, $saturation: null, $lightness: null,
    $whiteness: null, $blackness: null,
    $alpha: null)
{% endcapture %}

{% function color_change, 'change-color(...)', 'returns:color' %}
  {% compatibility 'dart: "1.28.0"', 'libsass: false', 'ruby: false', 'feature: "$whiteness and $blackness"' %}{% endcompatibility %}

  {% markdown %}
    Sets one or more properties of a color to new values.

    Uses the value passed for each keyword argument in place of the
    corresponding property of the color, and returns the changed color. It's an
    error to specify an RGB property (`$red`, `$green`, and/or `$blue`) at the
    same time as an HSL property (`$hue`, `$saturation`, and/or `$lightness`),
    or either of those at the same time as an [HWB][] property (`$hue`,
    `$whiteness`, and/or `$blackness`).

    [HWB]: https://en.wikipedia.org/wiki/HWB_color_model

    All optional arguments must be numbers. The `$red`, `$green`, and `$blue`
    arguments must be [unitless][] and between 0 and 255 (inclusive). The `$hue`
    argument must have either the unit `deg` or no unit. The `$saturation`,
    `$lightness`, `$whiteness`, and `$blackness` arguments must be between `0%`
    and `100%` (inclusive), and may not be unitless. The `$alpha` argument must
    be unitless and between 0 and 1 (inclusive).

    [unitless]: /documentation/values/numbers#units

    See also:

    * [`color.scale()`](#scale) for fluidly scaling a color's properties.
    * [`color.adjust()`](#adjust) for adjusting a color's properties by fixed
    amounts.
  {% endmarkdown %}

  {% codeExample 'color-change', false %}
    @debug color.change(#6b717f, $red: 100); // #64717f
    @debug color.change(#d2e1dd, $red: 100, $blue: 50); // #64e132
    @debug color.change(#998099, $lightness: 30%, $alpha: 0.5); // rgba(85, 68, 85, 0.5)
    ===
    @debug color.change(#6b717f, $red: 100)  // #64717f
    @debug color.change(#d2e1dd, $red: 100, $blue: 50)  // #64e132
    @debug color.change(#998099, $lightness: 30%, $alpha: 0.5)  // rgba(85, 68, 85, 0.5)
  {% endcodeExample %}
{% endfunction %}

{% function 'color.complement($color)', 'complement($color)', 'returns:color' %}
  {% markdown %}
    Returns the RGB [complement][] of `$color`.

    This is identical to [`color.adjust($color, $hue: 180deg)`](#adjust).

    [complement]: https://en.wikipedia.org/wiki/Complementary_colors
  {% endmarkdown %}

  {% codeExample 'color-complement', false %}
    // Hue 222deg becomes 42deg.
    @debug color.complement(#6b717f); // #7f796b

    // Hue 164deg becomes 344deg.
    @debug color.complement(#d2e1dd); // #e1d2d6

    // Hue 210deg becomes 30deg.
    @debug color.complement(#036); // #663300
    ===
    // Hue 222deg becomes 42deg.
    @debug color.complement(#6b717f)  // #7f796b

    // Hue 164deg becomes 344deg.
    @debug color.complement(#d2e1dd)  // #e1d2d6

    // Hue 210deg becomes 30deg.
    @debug color.complement(#036)  // #663300
  {% endcodeExample %}
{% endfunction %}

{% function 'darken($color, $amount)', 'returns:color' %}
  {% markdown %}
    Makes `$color` darker.

    The `$amount` must be a number between `0%` and `100%` (inclusive).
    Decreases the HSL lightness of `$color` by that amount.
  {% endmarkdown %}

  {% headsUp false %}
    {% markdown %}
      The `darken()` function decreases lightness by a fixed amount, which is
      often not the desired effect. To make a color a certain percentage darker
      than it was before, use [`color.scale()`](#scale) instead.

      Because `darken()` is usually not the best way to make a color darker,
      it's not included directly in the new module system. However, if you have
      to preserve the existing behavior, `darken($color, $amount)` can be
      written [`color.adjust($color, $lightness: -$amount)`](#adjust).
    {% endmarkdown %}

    {% codeExample 'color-darken', false %}
      // #036 has lightness 20%, so when darken() subtracts 30% it just returns black.
      @debug darken(#036, 30%); // black

      // scale() instead makes it 30% darker than it was originally.
      @debug color.scale(#036, $lightness: -30%); // #002447
      ===
      // #036 has lightness 20%, so when darken() subtracts 30% it just returns black.
      @debug darken(#036, 30%)  // black

      // scale() instead makes it 30% darker than it was originally.
      @debug color.scale(#036, $lightness: -30%)  // #002447
    {% endcodeExample %}
  {% endheadsUp %}

  {% codeExample 'color-darken-2', false %}
    // Lightness 92% becomes 72%.
    @debug darken(#b37399, 20%); // #7c4465

    // Lightness 85% becomes 45%.
    @debug darken(#f2ece4, 40%); // #b08b5a

    // Lightness 20% becomes 0%.
    @debug darken(#036, 30%); // black
    ===
    // Lightness 92% becomes 72%.
    @debug darken(#b37399, 20%)  // #7c4465

    // Lightness 85% becomes 45%.
    @debug darken(#f2ece4, 40%)  // #b08b5a

    // Lightness 20% becomes 0%.
    @debug darken(#036, 30%)  // black
  {% endcodeExample %}
{% endfunction %}

{% function 'desaturate($color, $amount)', 'returns:color' %}
  {% markdown %}
    Makes `$color` less saturated.

    The `$amount` must be a number between `0%` and `100%` (inclusive).
    Decreases the HSL saturation of `$color` by that amount.
  {% endmarkdown %}

  {% headsUp false %}
    {% markdown %}
      The `desaturate()` function decreases saturation by a fixed amount, which
      is often not the desired effect. To make a color a certain percentage less
      saturated than it was before, use [`color.scale()`](#scale) instead.

      Because `desaturate()` is usually not the best way to make a color less
      saturated, it's not included directly in the new module system. However,
      if you have to preserve the existing behavior, `desaturate($color,
      $amount)` can be written [`color.adjust($color, $saturation:
      -$amount)`](#adjust).
    {% endmarkdown %}

    {% codeExample 'color-desaturate', false %}
      // #d2e1dd has saturation 20%, so when desaturate() subtracts 30% it just
      // returns gray.
      @debug desaturate(#d2e1dd, 30%); // #dadada

      // scale() instead makes it 30% less saturated than it was originally.
      @debug color.scale(#6b717f, $saturation: -30%); // #6e727c
      ===
      // #6b717f has saturation 20%, so when desaturate() subtracts 30% it just
      // returns gray.
      @debug desaturate(#d2e1dd, 30%)  // #dadada

      // scale() instead makes it 30% less saturated than it was originally.
      @debug color.scale(#6b717f, $saturation: -30%)  // #6e727c
    {% endcodeExample %}
  {% endheadsUp %}

  {% codeExample 'color-desaturate-2', false %}
    // Saturation 100% becomes 80%.
    @debug desaturate(#036, 20%); // #0a335c

    // Saturation 35% becomes 15%.
    @debug desaturate(#f2ece4, 20%); // #eeebe8

    // Saturation 20% becomes 0%.
    @debug desaturate(#d2e1dd, 30%); // #dadada
    ===
    // Saturation 100% becomes 80%.
    @debug desaturate(#036, 20%)  // #0a335c

    // Saturation 35% becomes 15%.
    @debug desaturate(#f2ece4, 20%)  // #eeebe8

    // Saturation 20% becomes 0%.
    @debug desaturate(#d2e1dd, 30%)  // #dadada
  {% endcodeExample %}
{% endfunction %}

{% function 'color.grayscale($color)', 'grayscale($color)', 'returns:color' %}
  {% markdown %}
    Returns a gray color with the same lightness as `$color`.

    This is identical to [`color.change($color, $saturation: 0%)`](#change).
  {% endmarkdown %}

  {% codeExample 'color-grayscale', false %}
    @debug color.grayscale(#6b717f); // #757575
    @debug color.grayscale(#d2e1dd); // #dadada
    @debug color.grayscale(#036); // #333333
    ===
    @debug color.grayscale(#6b717f)  // #757575
    @debug color.grayscale(#d2e1dd)  // #dadada
    @debug color.grayscale(#036)  // #333333
  {% endcodeExample %}
{% endfunction %}

{% function 'color.green($color)', 'green($color)', 'returns:number' %}
  {% markdown %}
    Returns the green channel of `$color` as a number between 0 and 255.

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.blue()`](#blue) for getting a color's blue channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-green', false %}
    @debug color.green(#e1d7d2); // 215
    @debug color.green(white); // 255
    @debug color.green(black); // 0
    ===
    @debug color.green(#e1d7d2)  // 215
    @debug color.green(white)  // 255
    @debug color.green(black)  // 0
  {% endcodeExample %}
{% endfunction %}

{% function 'color.hue($color)', 'hue($color)', 'returns:number' %}
  {% markdown %}
    Returns the hue of `$color` as a number between `0deg` and `360deg`.

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.blue()`](#blue) for getting a color's blue channel.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-hue', false %}
    @debug color.hue(#e1d7d2); // 20deg
    @debug color.hue(#f2ece4); // 34.2857142857deg
    @debug color.hue(#dadbdf); // 228deg
    ===
    @debug color.hue(#e1d7d2)  // 20deg
    @debug color.hue(#f2ece4)  // 34.2857142857deg
    @debug color.hue(#dadbdf)  // 228deg
  {% endcodeExample %}
{% endfunction %}

{% function 'color.hwb($hue $whiteness $blackness)', 'color.hwb($hue $whiteness $blackness / $alpha)', 'color.hwb($hue, $whiteness, $blackness, $alpha: 1)', 'returns:color' %}
  {% compatibility 'dart: "1.28.0"', 'libsass: false', 'ruby: false' %}{% endcompatibility %}

  {% markdown %}
    Returns a color with the given [hue, whiteness, and blackness][] and the
    given alpha channel.

    [hue, whiteness, and blackness]: https://en.wikipedia.org/wiki/HWB_color_model

    The hue is a number between `0deg` and `360deg` (inclusive). The whiteness
    and blackness are numbers between `0%` and `100%` (inclusive). The hue may
    be [unitless][], but the whiteness and blackness must have unit `%`. The
    alpha channel can be specified as either a unitless number between 0 and 1
    (inclusive), or a percentage between `0%` and `100%` (inclusive).

    [unitless]: /documentation/values/numbers#units
  {% endmarkdown %}

  {% headsUp %}
    Sass's [special parsing rules][] for slash-separated values make it
    difficult to pass variables for `$blackness` or `$alpha` when using the
    `color.hwb($hue $whiteness $blackness / $alpha)` signature. Consider using
    `color.hwb($hue, $whiteness, $blackness, $alpha)` instead.

    [special parsing rules]: /documentation/operators/numeric#slash-separated-values
  {% endheadsUp %}

  {% codeExample 'color-hwb', false %}
    @debug color.hwb(210, 0%, 60%); // #036
    @debug color.hwb(34, 89%, 5%); // #f2ece4
    @debug color.hwb(210 0% 60% / 0.5); // rgba(0, 51, 102, 0.5)
    ===
    @debug color.hwb(210, 0%, 60%)  // #036
    @debug color.hwb(34, 89%, 5%)  // #f2ece4
    @debug color.hwb(210 0% 60% / 0.5)  // rgba(0, 51, 102, 0.5)
  {% endcodeExample %}
{% endfunction %}

{% function 'color.ie-hex-str($color)', 'ie-hex-str($color)', 'returns:unquoted string' %}
  {% markdown %}
    Returns an unquoted string that represents `$color` in the `#AARRGGBB`
    format expected by Internet Explorer's [`-ms-filter`][] property.

    [`-ms-filter`]: https://developer.mozilla.org/en-US/docs/Web/CSS/-ms-filter
  {% endmarkdown %}

  {% codeExample 'color-ie-hex-str', false %}
    @debug color.ie-hex-str(#b37399); // #FFB37399
    @debug color.ie-hex-str(#808c99); // #FF808C99
    @debug color.ie-hex-str(rgba(242, 236, 228, 0.6)); // #99F2ECE4
    ===
    @debug color.ie-hex-str(#b37399); // #FFB37399
    @debug color.ie-hex-str(#808c99); // #FF808C99
    @debug color.ie-hex-str(rgba(242, 236, 228, 0.6)); // #99F2ECE4
  {% endcodeExample %}
{% endfunction %}

{% function 'color.invert($color, $weight: 100%)', 'invert($color, $weight: 100%)', 'returns:color' %}
  {% markdown %}
    Returns the inverse or [negative][] of `$color`.

    [negative]: https://en.wikipedia.org/wiki/Negative_(photography)

    The `$weight` must be a number between `0%` and `100%` (inclusive). A higher
    weight means the result will be closer to the negative, and a lower weight
    means it will be closer to `$color`. Weight `50%` will always produce
    `#808080`.
  {% endmarkdown %}

  {% codeExample 'color-invert', false %}
    @debug color.invert(#b37399); // #4c8c66
    @debug color.invert(black); // white
    @debug color.invert(#550e0c, 20%); // #663b3a
    ===
    @debug color.invert(#b37399)  // #4c8c66
    @debug color.invert(black)  // white
    @debug color.invert(#550e0c, 20%)  // #663b3a
  {% endcodeExample %}
{% endfunction %}

{% function 'lighten($color, $amount)', 'returns:color' %}
  {% markdown %}
    Makes `$color` lighter.

    The `$amount` must be a number between `0%` and `100%` (inclusive).
    Increases the HSL lightness of `$color` by that amount.
  {% endmarkdown %}

  {% headsUp false %}
    {% markdown %}
      The `lighten()` function increases lightness by a fixed amount, which is
      often not the desired effect. To make a color a certain percentage lighter
      than it was before, use [`scale()`](#scale) instead.

      Because `lighten()` is usually not the best way to make a color lighter,
      it's not included directly in the new module system. However, if you have
      to preserve the existing behavior, `lighten($color, $amount)` can be
      written [`adjust($color, $lightness: $amount)`](#adjust).
    {% endmarkdown %}

    {% codeExample 'color-lighten', false %}
      // #e1d7d2 has lightness 85%, so when lighten() adds 30% it just returns white.
      @debug lighten(#e1d7d2, 30%); // white

      // scale() instead makes it 30% lighter than it was originally.
      @debug color.scale(#e1d7d2, $lightness: 30%); // #eae3e0
      ===
      // #e1d7d2 has lightness 85%, so when lighten() adds 30% it just returns white.
      @debug lighten(#e1d7d2, 30%)  // white

      // scale() instead makes it 30% lighter than it was originally.
      @debug color.scale(#e1d7d2, $lightness: 30%)  // #eae3e0
    {% endcodeExample %}
  {% endheadsUp %}

  {% codeExample 'color-lighten-2', false %}
    // Lightness 46% becomes 66%.
    @debug lighten(#6b717f, 20%); // #a1a5af

    // Lightness 20% becomes 80%.
    @debug lighten(#036, 60%); // #99ccff

    // Lightness 85% becomes 100%.
    @debug lighten(#e1d7d2, 30%); // white
    ===
    // Lightness 46% becomes 66%.
    @debug lighten(#6b717f, 20%)  // #a1a5af

    // Lightness 20% becomes 80%.
    @debug lighten(#036, 60%)  // #99ccff

    // Lightness 85% becomes 100%.
    @debug lighten(#e1d7d2, 30%)  // white
  {% endcodeExample %}
{% endfunction %}

{% function 'color.lightness($color)', 'lightness($color)', 'returns:number' %}
  {% markdown %}
    Returns the HSL lightness of `$color` as a number between `0%` and `100%`.

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.blue()`](#blue) for getting a color's blue channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-lightness', false %}
    @debug color.lightness(#e1d7d2); // 85.2941176471%
    @debug color.lightness(#f2ece4); // 92.1568627451%
    @debug color.lightness(#dadbdf); // 86.4705882353%
    ===
    @debug color.lightness(#e1d7d2)  // 85.2941176471%
    @debug color.lightness(#f2ece4)  // 92.1568627451%
    @debug color.lightness(#dadbdf)  // 86.4705882353%
  {% endcodeExample %}
{% endfunction %}

{% function 'color.mix($color1, $color2, $weight: 50%)', 'mix($color1, $color2, $weight: 50%)', 'returns:color' %}
  {% markdown %}
    Returns a color that's a mixture of `$color1` and `$color2`.

    Both the `$weight` and the relative opacity of each color determines how
    much of each color is in the result. The `$weight` must be a number between
    `0%` and `100%` (inclusive). A larger weight indicates that more of
    `$color1` should be used, and a smaller weight indicates that more of
    `$color2` should be used.
  {% endmarkdown %}

  {% codeExample 'color-mix', false %}
    @debug color.mix(#036, #d2e1dd); // #698aa2
    @debug color.mix(#036, #d2e1dd, 75%); // #355f84
    @debug color.mix(#036, #d2e1dd, 25%); // #9eb6bf
    @debug color.mix(rgba(242, 236, 228, 0.5), #6b717f); // rgba(141, 144, 152, 0.75)
    ===
    @debug color.mix(#036, #d2e1dd)  // #698aa2
    @debug color.mix(#036, #d2e1dd, 75%)  // #355f84
    @debug color.mix(#036, #d2e1dd, 25%)  // #9eb6bf
    @debug color.mix(rgba(242, 236, 228, 0.5), #6b717f)  // rgba(141, 144, 152, 0.75)
  {% endcodeExample %}
{% endfunction %}

{% function 'opacify($color, $amount)', 'fade-in($color, $amount)', 'returns:color' %}
  {% markdown %}
    Makes `$color` more opaque.

    The `$amount` must be a number between `0` and `1` (inclusive). Increases
    the alpha channel of `$color` by that amount.
  {% endmarkdown %}

  {% headsUp false %}
    {% markdown %}
      The `opacify()` function increases the alpha channel by a fixed amount,
      which is often not the desired effect. To make a color a certain
      percentage more opaque than it was before, use [`scale()`](#scale)
      instead.

      Because `opacify()` is usually not the best way to make a color more
      opaque, it's not included directly in the new module system. However, if
      you have to preserve the existing behavior, `opacify($color, $amount)` can
      be written [`adjust($color, $alpha: -$amount)`](#adjust).
    {% endmarkdown %}

    {% codeExample 'color-opacify', false %}
      // rgba(#036, 0.7) has alpha 0.7, so when opacify() adds 0.3 it returns a fully
      // opaque color.
      @debug opacify(rgba(#036, 0.7), 0.3); // #036

      // scale() instead makes it 30% more opaque than it was originally.
      @debug color.scale(rgba(#036, 0.7), $alpha: 30%); // rgba(0, 51, 102, 0.79)
      ===
      // rgba(#036, 0.7) has alpha 0.7, so when opacify() adds 0.3 it returns a fully
      // opaque color.
      @debug opacify(rgba(#036, 0.7), 0.3)  // #036

      // scale() instead makes it 30% more opaque than it was originally.
      @debug color.scale(rgba(#036, 0.7), $alpha: 30%)  // rgba(0, 51, 102, 0.79)
    {% endcodeExample %}
  {% endheadsUp %}

  {% codeExample 'color-opacify-2', false %}
    @debug opacify(rgba(#6b717f, 0.5), 0.2); // rgba(107, 113, 127, 0.7)
    @debug fade-in(rgba(#e1d7d2, 0.5), 0.4); // rgba(225, 215, 210, 0.9)
    @debug opacify(rgba(#036, 0.7), 0.3); // #036
    ===
    @debug opacify(rgba(#6b717f, 0.5), 0.2)  // rgba(107, 113, 127, 0.7)
    @debug fade-in(rgba(#e1d7d2, 0.5), 0.4)  // rgba(225, 215, 210, 0.9)
    @debug opacify(rgba(#036, 0.7), 0.3)  // #036
  {% endcodeExample %}
{% endfunction %}

{% function 'color.red($color)', 'red($color)', 'returns:number' %}
  {% markdown %}
    Returns the red channel of `$color` as a number between 0 and 255.

    See also:

    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.blue()`](#blue) for getting a color's blue channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-red', false %}
    @debug color.red(#e1d7d2); // 225
    @debug color.red(white); // 255
    @debug color.red(black); // 0
    ===
    @debug color.red(#e1d7d2)  // 225
    @debug color.red(white)  // 255
    @debug color.red(black)  // 0
  {% endcodeExample %}
{% endfunction %}

{% function 'color.saturate($color, $amount)', 'saturate($color, $amount)', 'returns:color' %}
  {% markdown %}
    Makes `$color` more saturated.

    The `$amount` must be a number between `0%` and `100%` (inclusive).
    Increases the HSL saturation of `$color` by that amount.
  {% endmarkdown %}

  {% headsUp false %}
    {% markdown %}
      The `saturate()` function increases saturation by a fixed amount, which is
      often not the desired effect. To make a color a certain percentage more
      saturated than it was before, use [`scale()`](#scale) instead.

      Because `saturate()` is usually not the best way to make a color more
      saturated, it's not included directly in the new module system. However,
      if you have to preserve the existing behavior, `saturate($color, $amount)`
      can be written [`adjust($color, $saturation: $amount)`](#adjust).
    {% endmarkdown %}

    {% codeExample 'color-saturate', false %}
      // #0e4982 has saturation 80%, so when saturate() adds 30% it just becomes
      // fully saturated.
      @debug saturate(#0e4982, 30%); // #004990

      // scale() instead makes it 30% more saturated than it was originally.
      @debug color.scale(#0e4982, $saturation: 30%); // #0a4986
      ===
      // #0e4982 has saturation 80%, so when saturate() adds 30% it just becomes
      // fully saturated.
      @debug saturate(#0e4982, 30%)  // #004990

      // scale() instead makes it 30% more saturated than it was originally.
      @debug color.scale(#0e4982, $saturation: 30%)  // #0a4986
    {% endcodeExample %}
  {% endheadsUp %}

  {% codeExample 'color-saturate-2', false %}
    // Saturation 50% becomes 70%.
    @debug saturate(#c69, 20%); // #e05299

    // Saturation 35% becomes 85%.
    @debug desaturate(#f2ece4, 50%); // #ebebeb

    // Saturation 80% becomes 100%.
    @debug saturate(#0e4982, 30%)  // #004990
    ===
    // Saturation 50% becomes 70%.
    @debug saturate(#c69, 20%); // #e05299

    // Saturation 35% becomes 85%.
    @debug desaturate(#f2ece4, 50%); // #ebebeb

    // Saturation 80% becomes 100%.
    @debug saturate(#0e4982, 30%)  // #004990
  {% endcodeExample %}
{% endfunction %}

{% function 'color.saturation($color)', 'saturation($color)', 'returns:number' %}
  {% markdown %}
    Returns the HSL saturation of `$color` as a number between `0%` and `100%`.

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.blue()`](#blue) for getting a color's blue channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.whiteness()`](#whiteness) for getting a color's whiteness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-saturation', false %}
    @debug color.saturation(#e1d7d2); // 20%
    @debug color.saturation(#f2ece4); // 30%
    @debug color.saturation(#dadbdf); // 7.2463768116%
    ===
    @debug color.saturation(#e1d7d2)  // 20%
    @debug color.saturation(#f2ece4)  // 30%
    @debug color.saturation(#dadbdf)  // 7.2463768116%
  {% endcodeExample %}
{% endfunction %}

{% capture color_scale %}
  color.scale($color,
    $red: null, $green: null, $blue: null,
    $saturation: null, $lightness: null,
    $whiteness: null, $blackness: null,
    $alpha: null)
{% endcapture %}

{% function color_scale, 'scale-color(...)', 'returns:color' %}
  {% compatibility 'dart: "1.28.0"', 'libsass: false', 'ruby: false', 'feature: "$whiteness and $blackness"' %}{% endcompatibility %}

  {% markdown %}
    Fluidly scales one or more properties of `$color`.

    Each keyword argument must be a number between `-100%` and `100%`
    (inclusive). This indicates how far the corresponding property should be
    moved from its original position towards the maximum (if the argument is
    positive) or the minimum (if the argument is negative). This means that, for
    example, `$lightness: 50%` will make all colors `50%` closer to maximum
    lightness without making them fully white.

    It's an error to specify an RGB property (`$red`, `$green`, and/or `$blue`)
    at the same time as an HSL property (`$saturation`, and/or `$lightness`), or
    either of those at the same time as an [HWB][] property (`$whiteness`,
    and/or `$blackness`).

    [HWB]: https://en.wikipedia.org/wiki/HWB_color_model

    See also:

    * [`color.adjust()`](#adjust) for changing a color's properties by fixed
      amounts.
    * [`color.change()`](#change) for setting a color's properties.
  {% endmarkdown %}

  {% codeExample 'color-scale', false %}
    @debug color.scale(#6b717f, $red: 15%); // #81717f
    @debug color.scale(#d2e1dd, $lightness: -10%, $saturation: 10%); // #b3d4cb
    @debug color.scale(#998099, $alpha: -40%); // rgba(153, 128, 153, 0.6)
    ===
    @debug color.scale(#6b717f, $red: 15%)  // #81717f
    @debug color.scale(#d2e1dd, $lightness: -10%, $saturation: 10%)  // #b3d4cb
    @debug color.scale(#998099, $alpha: -40%)  // rgba(153, 128, 153, 0.6)
  {% endcodeExample %}
{% endfunction %}

{% function 'transparentize($color, $amount)', 'fade-out($color, $amount)', 'returns:color' %}
  {% markdown %}
    Makes `$color` more transparent.

    The `$amount` must be a number between `0` and `1` (inclusive). Decreases
    the alpha channel of `$color` by that amount.
  {% endmarkdown %}

  {% headsUp false %}
    {% markdown %}
      The `transparentize()` function decreases the alpha channel by a fixed
      amount, which is often not the desired effect. To make a color a certain
      percentage more transparent than it was before, use
      [`color.scale()`](#scale) instead.

      Because `transparentize()` is usually not the best way to make a color
      more transparent, it's not included directly in the new module system.
      However, if you have to preserve the existing behavior,
      `transparentize($color, $amount)` can be written [`color.adjust($color,
      $alpha: -$amount)`](#adjust).
    {% endmarkdown %}

    {% codeExample 'transparentize', false %}
      // rgba(#036, 0.3) has alpha 0.3, so when transparentize() subtracts 0.3 it
      // returns a fully transparent color.
      @debug transparentize(rgba(#036, 0.3), 0.3); // rgba(0, 51, 102, 0)

      // scale() instead makes it 30% more transparent than it was originally.
      @debug color.scale(rgba(#036, 0.3), $alpha: -30%); // rgba(0, 51, 102, 0.21)
      ===
      // rgba(#036, 0.3) has alpha 0.3, so when transparentize() subtracts 0.3 it
      // returns a fully transparent color.
      @debug transparentize(rgba(#036, 0.3), 0.3)  // rgba(0, 51, 102, 0)

      // scale() instead makes it 30% more transparent than it was originally.
      @debug color.scale(rgba(#036, 0.3), $alpha: -30%)  // rgba(0, 51, 102, 0.21)
    {% endcodeExample %}
  {% endheadsUp %}

  {% codeExample 'transparentize-2', false %}
    @debug transparentize(rgba(#6b717f, 0.5), 0.2)  // rgba(107, 113, 127, 0.3)
    @debug fade-out(rgba(#e1d7d2, 0.5), 0.4)  // rgba(225, 215, 210, 0.1)
    @debug transparentize(rgba(#036, 0.3), 0.3)  // rgba(0, 51, 102, 0)
    ===
    @debug transparentize(rgba(#6b717f, 0.5), 0.2)  // rgba(107, 113, 127, 0.3)
    @debug fade-out(rgba(#e1d7d2, 0.5), 0.4)  // rgba(225, 215, 210, 0.1)
    @debug transparentize(rgba(#036, 0.3), 0.3)  // rgba(0, 51, 102, 0)
  {% endcodeExample %}
{% endfunction %}

{% function 'color.whiteness($color)', 'returns:number' %}
  {% compatibility 'dart: "1.28.0"', 'libsass: false', 'ruby: false' %}{% endcompatibility %}

  {% markdown %}
    Returns the [HWB][] whiteness of `$color` as a number between `0%` and
    `100%`.

    [HWB]: https://en.wikipedia.org/wiki/HWB_color_model

    See also:

    * [`color.red()`](#red) for getting a color's red channel.
    * [`color.green()`](#green) for getting a color's green channel.
    * [`color.hue()`](#hue) for getting a color's hue.
    * [`color.saturation()`](#saturation) for getting a color's saturation.
    * [`color.lightness()`](#lightness) for getting a color's lightness.
    * [`color.blackness()`](#blackness) for getting a color's blackness.
    * [`color.alpha()`](#alpha) for getting a color's alpha channel.
  {% endmarkdown %}

  {% codeExample 'color-whiteness', false %}
    @debug color.whiteness(#e1d7d2); // 82.3529411765%
    @debug color.whiteness(white); // 100%
    @debug color.whiteness(black); // 0%
    ===
    @debug color.whiteness(#e1d7d2)  // 82.3529411765%
    @debug color.whiteness(white)  // 100%
    @debug color.whiteness(black)  // 0%
  {% endcodeExample %}
{% endfunction %}