Quote - At least I know that CYMK is the color space needed for printing.

It is if you're having prints made on a four-color system such as offset litho or a similar digital print system, e.g. color laser, Indigo etc. BUT if you're having inkjet prints made, read on:

Most inkjet based systems have anything up to 12 inks, and CMYK is the least preferable for these. Sure you can throw CMYK images at them, but the printer software will convert them to RGB or LAB on-the-fly and then map these colors into their own multicolor space.

People may tell you otherwise. They're wrong. Trust me, it's my job to know about these things. Any talk to the effect that 'our RIP only accepts CMYK files' is bullsh*t. The exception to this is if they use an Iris printer (which only has CMYK inks).

A digital photo printer (which uses red, green and blue lasers to expose photographic material) will probably insist on RGB, for obvious reasons. Ask them which RGB color space you should use - if they don't know, make sure your images are in sRGB, as that is the default for most such systems. I've seen horrible prints produced from files in AdobeRGB, and the simple fix was always to convert them to sRGB.

Always confer with your print service provider to find out the how you should provide image files.

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