RGB to CMYK
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- monNom0
this might be kinda off, as I'm a little rusty:
open up your edit>color preferences.
step 1: set a CMYK working space that matches your output. This will vary based on the medium but US Sheetfed Coated/uncoated are pretty common.
step 2: under 'conversion options' pick an intent. This will determine how the colours are converted. For instance, picking 'saturation' will try to keep colours as bright as possible, but will shift hues to the the nearest bright colour in the gamut. Perceptual will dim the image and apply a colour-cast to affect how the other colours are percieved. etc. use google to find our the right one if you're still confused.
now in RGB mode, use the proof colours and gamut controls (proof colours: ctrl+y. gamut warning: ctrl+shift+y) to see how your image is converting before you turn it to CMYK. Your gamut waring will highlight areas of the image that will not convert well. Use color adjustments to work on those areas specifically, or on the broad image until there are minimal flagged pixels. This will give you the most control.
You'll need to make choices about how the colour should be interpretted. For instance If you have a pure red (FF0000) that is part of a fire, you might shift that colour toward orange to bring it into gamut. If that red is part of a red dress, you might choose to shift it toward a plum colour instead. the "wrong" colour can look right depending on the situation.
Once you've got the image looking how you like (in RGB) and with minimal gamut warning, convert to CMYK and you should see virtually the same image with very little change.
hope that helps.