xcolor

xcolor: LaTeX color extensions. xcolor is a LaTeX package that provides easy driver-independent access to several kinds of colors, tints, shades, tones, and mixes of arbitrary colors by means of color expressions like color{red!50!green!20!blue}. It allows to select a document-wide target color model and offers tools for automatic color schemes, conversion between twelve color models (rgb, cmy, cmyk, hsb, Hsb, tHsb, gray, RGB, HTML, HSB, Gray, wave), alternating table row colors, color blending, color masking, color separation, and color wheel calculations. See also chroma for an extensive application of xcolor.