Editing of digital images, including (but not limited to) color-to-monochromatic conversion and changing the color of a monochromatic image

摘要

Color is edited using a color representation including digital values B (brightness), e and f such that B=√{square root over (D²+E²+F²)}, e=E/B, f=F/B, where DEF is a linear color coordinate system. Alternatively, color is represented using digital values B, C (chroma) and H (hue), where cos C=D/B and tan H=E/F. Color-to-monochromatic image conversion, or changing the color of a monochromatic image, can be accomplished by setting e and f to constant values, and possibly (not necessarily) leaving B unchanged. Alternatively, the conversion can be accomplished by setting C and H to constant values. Other features are also provided.