On [2005-Aug-19] Christopher Colbert <co...@chop.swmed.edu> wrote: > > Hi Pymol'rs, > > I have search the Wiki and Mail-list archive to find a protocul for using > the CMYK color space, but have only found "color-safe" definitions. > > My Question(s): > > When do you define the color space during the creation of a figure to > ensure usage of a particular color space, ie. cmyk? Can this be done from > a script and with which command, "space cmyk"? > > >From my understanding from the mail-list, I need to define the color > space before I use any color. Is this correct? Can it also be done > retroactively prior to ray tracing? > > Finally, once the color space is defined, do all the rgb colors get > redefined automatically, or does this need to happen manually? I > found the table for the biggest culprits, but Warren pointed out there was > internally defined colors for the atom types. Does someone have a macro > that redefines the pymol defined colors including those for the atoms?
Chris, CMYK is a device-dependent colour space, i.e. the colour that is chosen to match to a particular RGB colour depends on the machine it is going to be printed on (and hence the inks that will be used in the printing). Therefore there is no one-to-one mapping of CMYK values to RGB values (even with a profile defining how the RGB values should be displayed). Since pymol's idea of CMYK is so limited (and from a printer's point of view probably shouldn't even exist) you are far better off getting the RGB image out of pymol to look just the way you want it to (assuming a calibrated display and approprate colour profile) and then use a full-featured converter to generate the appropriate CMYK image for the device it is going to be printed on. One suggestion for a converter is GIMP (soon to be renamed something else) because it does know how to use/respect ICC profiles. Rich
