Better CMYK Conversions

I suggest that you leave your image in RGB mode when printing to an ink jet printer. Even though the printer uses cyan, magenta, yellow, and black ink, Photoshop uses the same software that draws your screen image to send information to the printer. That software only handles RGB information, so there is no advantage to printing from CMYK. Postscript language printers can bypass that screen-drawing software and therefore can produce acceptable results from either RGB or CMYK mode.

You'll want to convert your images to CMYK mode if they will be printed on a commercial printing press. The traditional way of doing that is ...

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