ColorCalc – command-line calculator for colors
If you’re one of the few crazies like me who prefer doing web development using command-line tools, you might appreciate this simple command-line calculator which can operate on RGB colors. It supports the 4 basic arithmetic operations and grouping using parens. Examples:
C:> colorcalc FFFFFF / 2
808080 (0.5)
You can use scalar values, as well.
C:> colorcalc 808080
808080 (0.501961)
Since 0 is #000000 and 1 is #FFFFFF, 0.5 is between #7F7F7F and #808080.
C:> colorcalc 808080 * 808080
404040 (0.251965)
Vector-ish multiplication – approximative equivalent of 0.5 * 0.5.
C:> colorcalc 1-FFCC00
0033FF
Get the negative of a color.
C:> colorcalc (FFCC00 + CCDDFF) / 2
E6D580
Calculate the mean value of two colors.
etc.