Let me see if I can help here... "Can the file type have an effect on the printed output? Ultimately, the artwork will be in illustrator but I am hoping to send the initial RGB matrix as a PDF. The original file is actually an ASCII HPGL2 file." - Yes. Your file should have a profile assigned to it, which relates to your application's color settings. Or put another way, if I print out a block of RGB colour using photoshop, will that differ from the same colour block printed from illustrator, or CoralDraw? - Yes. Unless all settings and profiles are the same. Does changing the colourspace change the printed output of the file, or is it a system to stop the user selecting a colour that cannot be printed? - Some colors are "Out -of-Gamut" in both RGB and CMYK. Yur application typically warns you. Obviously, RGB get translated to CMYK, but at what stage does this happen? Within the graphics program or through the driver supplied by the printer manufacturer? - You can select somewhere in your print dialogs whether to let your application determine color or let the printer determine color. The choices you make in the Print dialog boxes have a direct effect on how your printer driver interprets color information. Typically, the conversions are done in the print driver.
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