blend.py

b is the bottom image.
t is the top image.

normal group

• normal(b,t)

darken group

• darken(b,t)
• multiply(b,t)
• color_burn(b,t)
• linear_burn(b,t)
• darker_color(b,t)

lighten group

• lighten(b,t)
• screen(b,t)
• color_dodge(b,t)
• linear_dodge(b,t)
• lighter_color(b,t)

contrast group

• overlay(b,t)
• soft_light(b,t)
• hard_light(b,t)
• vivid_light(b,t)
• linear_light(b,t)
• pin_light(b,t)
• hard_mix(b,t)

inversion group

• difference(b,t)
• exclusion(b,t)

cancellation group

• subtract(b,t)
• divide(b,t)

component group

• hue(b,t)
• saturation(b,t)