Color Dodge brightens the base layer based on the color of the blending layer, reducing contrast while dramatically increasing the intensity of brighter colors. It can create intense, glowing effects that quickly push colors toward white.
The Math
Color Dodge divides the base color by the inverse of the blending color. The brighter the blending color becomes, the smaller the number it is divided by, producing a much brighter result.
Mathier Math
Color Dodge uses the following basic operation:
Result = Base ÷ (1 − Blend)
The colors are first converted to values between 0 and 1. For example, if the base value is 0.5 and the blend value is 0.6:
0.5 ÷ (1 − 0.6)
0.5 ÷ 0.4 = 1.25
Because RGB values cannot exceed 1, the result is clamped to 1, producing pure white.
This is why Color Dodge becomes so intense as the blend color approaches white: the denominator approaches zero, causing the result to shoot rapidly toward white.
Core Rules of Color Dodge
Black disappears: Pure black on the top layer has a value of zero, so it leaves the base layer unchanged.
White blows out: Pure white makes the denominator zero, pushing the result to the maximum brightness value.
Bright colors hit hard: Lighter colors on the top layer dramatically increase brightness and can quickly push the underlying colors toward white.
Use with restraint: Color Dodge can become extremely intense, so lowering layer opacity or using a soft brush can help keep the effect under control.
When to Use It
Adding glows: Great for painting magical effects, neon lights, glowing eyes, and other intense sources of light.
Light rays: Useful for high-intensity sunbeams, reflections, or bright light hitting a character or environment.
Color boosting: Use a soft brush at low opacity to inject vibrant color and intensity into existing highlights.