FYI, my company writes most of its own output in PostScript for high end laser 
printers (e.g., Xerox I-GEN 3 and 4). We avoid CMYK. But we're not a pre-canned 
application company, we write everything ourselves. All of our printers work 
great with RGB colorspace. The need for CMYK is usually based on the software 
that goes with the printer or the shop's chosen software helper applications. I 
suspect that CMYK in the laser printer market is just something passed on from 
wet press. However, people often send CMYK art to us, and we need the ability 
to import CMYK into RGB. 

About PDF: PDF has some of its own drawing language, but when it comes to 
raster, it simply embeds bitmaps. That imbedded bitmap can be an almost exact 
copy of tiff, png, gif, whatever. PDF is a hybrid vector language with embedded 
bitmap. I'd love the ability to import or export with PDF pages translated 
to/from layers. 

And kudos to gimp for having the best quality PostScript. Gimp outputs valid 
PostScript, which I can't say the same for on most Adobe products. PDF used to 
be a proprietary thing, where Adobe made readers free, and writers pay, but 
they turned it into an open standard and anyone is free to do whatever they 
want these days. I'd trust gimp to do a better job at a PDF implementation than 
I would Adobe. 

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