I have been trying to convert some PostScript files that use the RGB colorspace into CMYK PostScript.  IDL purports to support the creation of CMYK PostScript with the /cmyk keyword to the device command.  I can produce images using that keyword and get no error messages.  The images, viewed in a PostScript previewer look fine but if I use the "identify" routine from ImageMagick it lists the colorspace as RGB.  I have been able to create CMYK images through other means (and that the identify routine lists as CMYK). So, does anyone know -- is there a problem with that identify routine or does IDL not really support CMYK PostScript?