Hue, Saturation, Luminosity
Color:
base - luminosity
blend - hue, saturation
ex. colorizing
grayscale layer - base
color layer - blend
Hue:
base - saturation
blend - hue
Similar to Color, but Hue is used by other software
Saturation:
base - luminosity, hue
blend - saturation
Luminosity:
base - hue, saturation
blend - luminosity
ie. opposite of Color