In CSS you can specify colors in the following ways:
using one of the following constants which are converted to RGB values internally: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, yellow.
"#" followed by a 6 digit RGB value in hexadecimal notation, e.g. "#00ff00" for perfect green.
You can abbreviate this notation by using only 3 digits which will be expanded internally, e.g. "#0f5" equals "#00ff55".
Using the function "rgb". It takes the 3 RGB component values as parameters in decimal or procentual notation, e.g. "rgb(0,255,0)" or "rgb(0%,100%,0%)" for perfect green.
How do I set CMYK colors? Besides "rgb" PDFreactor also supports the non-standard function "cmyk". It takes the 4 CMYK component values as parameters in decimal or percent notation, e.g. "cmyk(0,0,255,0)" or "cmyk(0%,0%,100%,0%)" for perfect yellow.