Your first, natural question might be: in CMYK, why is the K black? In traditional press-preparation of color separated plates, a black keyline was used as a color indicator and as a black printed outline. Because the keyline was on the black plate, the K in CMYK represents the keyline...
Note for GIMP users: You can achieve similar selections and effects by using the “Select by Color” tool, which can be found under Tools > Selection Tools > By Color Select. You can set your Threshold in your toolbar, shown above right, and get similar results in the “Selection Editor...
script_id=927A simple interactive RGB/HSV color selector modelled after Gimp2 RGB/HSV color selector. Needs gvim and :set nocp (and probably a high-color display). Usage: :so colorsel.vim and :ColorSel [color] starts the color selector. The optional color argument can be in rrggbb ...
1option.selected{ 2color:White; 3background-color:Cyan; 4} 这样在 IE 8、IE 9 和 Chrome 18.0 浏览器中也能正常显示了,如下所示: