Question

我使用 LESS ，我希望利用各种集成color functions，只允许设置几种基本颜色，然后派生其他人改变 Hue，Saturation，亮度，旋转， ecc。

让我们想象一下，我的着色器中有以下两种颜色（本例中为浅绿色和深绿色）：

@primary-color:    rgb(0,100,60);
@secondary-color:  rgb(185,215,50);

我想在适当的HSL转换后仅显式设置@primary-color然后获取 @secondary-color。（例如darken(hsl(90, 80%, 50%), 20%））

有没有办法确定为了获得@primary-color 而必须应用于@secondary-color的hsl设置？

换句话说：

鉴于2种RGB颜色定义，有没有办法确定它们之间存在 Hue ， Saturation 和 Lightness 方面的差异，将@secondary-color表示为@primary-color的变体？

P.S。：如果需要，也可以借助Photoshop等外部工具。

Answer 1

这是计算两种颜色的色调，饱和度和亮度值之间的差异的方法，然后使用它来计算基于第一种颜色的第二种颜色。

各个步骤如下：

色差计算：使用hue()，saturation()和lightness()函数计算两种给定颜色之间的色调，饱和度和亮度差异。此功能可单独使用，仅用于输出差异。
基于主要颜色到达辅助颜色：这是一个三步过程，它们如下所示：
- 通过传递两种颜色之间的色调差异，使用spin()功能调整原色的色调
- 根据差异，使用saturate()或desaturate()功能调整色调调整后颜色的饱和度（从上一步开始）。
- 根据差异，使用darken()或lighten()函数调整饱和度调整后的颜色亮度（从上一步开始）。

这个答案是关于如何从另一种颜色计算一种颜色的SASS Article的较少改编。

@primary: rgb(0,100,60); /* primary color */
@secondary: rgb(185,215,50); /* secondary color */

/* mixin to calculate the difference between two given colors */
.color-diff(@color1; @color2){ 
    @hueDiff: hue(@color2) - hue(@color1);
    @saturationDiff: saturation(@color1) - saturation(@color2);
    @lightnessDiff: lightness(@color1)- lightness(@color2);

    color1: @color1; color2:@color2; /* just for testing, can be removed */
}

/* Step 1: mixin to adjust the hue difference between the colors */
.adjust-hue(@color; @diff){ 
    @hueAdjusted: spin(@color, @hueDiff);
}

/* Step 2: mixin to adjust the saturation difference */
.adjust-saturation(@color; @diff) when (@diff > 0){
    @satAdjusted: desaturate(@color, abs(@diff)); /* desaturate if diff is greater than 0 */
}
.adjust-saturation(@color; @diff) when not (@diff > 0){
    @satAdjusted: saturate(@color, abs(@diff)); /* saturate if diff is not greater than 0 */
}

/* Step 3: mixin to adjust the lightness diff between the colors */
.adjust-lightness(@color; @diff) when (@diff > 0){
    @lightnessAdjusted: darken(@color, abs(@diff)); /* darken if diff is greater than 0 */
}
.adjust-lightness(@color; @diff) when not (@diff > 0){
    @lightnessAdjusted: lighten(@color, abs(@diff)); /* else lighten */
}

div{
    .color-diff(@primary; @secondary);
    .adjust-hue(@primary; @hueDiff);
    .adjust-saturation(@hueAdjusted; @saturationDiff);
    .adjust-lightness(@satAdjusted; @lightnessDiff);
    color: @lightnessAdjusted; /* final output value */
}

已编译的CSS：

div {
    color1: #00643c;
    color2: #b9d732;
    color: #b9d732;
}

如果您只想获得两种颜色之间的差异，那么您可以使用如下的循环输出色调，饱和度和亮度值方面的差异。

@color-list-1: rgb(0,100,60), #B0BCA7, #ABCDEF; /* list of primary colors */
@color-list-2: rgb(185,215,50), #BADA55, #FEDCBA; /* list of secondary colors */

#output{
    .loop-colors(@index) when (@index > 0){
        @primary: extract(@color-list-1, @index);
        @secondary: extract(@color-list-2, @index);
        .color-diff(@primary; @secondary);

        /* output the values of the comparison */
        color-comparison-@{index}+: ~"Hue Difference: @{hueDiff}";
        color-comparison-@{index}+: ~"Saturation Difference: @{saturationDiff}";        
        color-comparison-@{index}+: ~"Lightness Difference: @{lightnessDiff}";
        .loop-colors(@index - 1);
    }
    .loop-colors(length(@color-list-1));
}

上面的代码将比较两个列表中的相应值，并输出它们之间的差异，如下所示：

#output {
  color-comparison-3: Hue Difference: -180, Saturation Difference: -29.142857142857153%, Lightness Difference: -5.882352941176478%;
  color-comparison-2: Hue Difference: -19.849624060150404, Saturation Difference: -50.70282063269439%, Lightness Difference: 10.196078431372548%;
  color-comparison-1: Hue Difference: -85.09090909090908, Saturation Difference: 32.65306122448979%, Lightness Difference: -32.352941176470594%;
}

确定HSL变化以转换另一种颜色

1 个答案: