algorithm - 获取给定颜色的渐变，其中颜色位于渐变中间

Question

假设我有一个随机的 RGB 值，例如 240 23 123。好吗？所以我想在 HSV 中转换 RGB 值，我需要 RGB 颜色正好在渐变的中间。所以渐变的所有其他值应该有更多的饱和度或更少。理想情况下，渐变应该总是倾向于白色，而与初始 RGB 值无关。有没有公​​式或算法来实现这一点？结果应该是 1 个梯度的 HSV 值数组。

Answer 1

如果您希望渐变从白色开始，转到您的颜色，然后转到黑色，您可以通过多种方式实现。这是一种方法：

const int numEntries = 20;
const int halfNumEntries = numEntries / 2;
RGBColor gradient[numEntries];
HSVColor hsv = RGBToHSV (rgb); // Where rgb is the RGB color you start with

// Gradient from white to your color
for (int i = 0; i < halfNumEntries; i++)
{
    float newHue = hsv.hue;
    float newSat = (i / halfNumEntries) * hsv.sat;
    float newVal = 1.0 + (i / halfNumEntries) * (hsv.val - 1.0);
    gradient [ i ] = HSVToRGB (newHue, newSat, newVal);
}

gradient [ halfNumEntries ] = rgb;

// Gradient from your color to black
for (int i = (halfNumEntries + 1); i < numEntries; i++)
{
    float newHue = hsv.hue;
    float newSat = hsv.sat + ((i - halfNumEntries) / (halfNumEntries - 1)) * (0.0 - hsv.sat);
    float newVal = hsv.val + ((i - halfNumEntries) / (halfNumEntries - 1)) * (0.0 - hsv.val);
    gradient [ i ] = HSVToRGB (newHue, newSat, newVal);
}