H

hard proofing
Previewing or proofing an image by printing a hard copy of it.
HLS
A color space often used by artists. Its components are Hue, Lightness, and Saturation.
HSV
A color space often used by artists. Its components are Hue, Saturation, and Value.
hue
A pure color. A hue is a specific position on the visible portion of the electromagnetic spectrum.