What is the difference between value and chroma? If I add black or white to a color I am changing its value. How do I change its chroma?
Value (or lightness) refers to the perceptual difference between white (high lightness or value) and black (low lightness). Chroma refers to the difference between a neutral gray (low chroma) and a color of the same lightness that is more colorful (like a vivid red … a high chroma). Stimuli can, of course, vary in both dimensions at once when physical changes are made. If you add black or white to a color (regardless of what type of color mixing you are doing) you will certainly be changing the value, but you will also be changing chroma. If you want to just change chroma, you should mix the color with a gray of equal lightness.
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