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There are two basic colorspaces for art: RGB and CMYK. (Yes, I know about LAB color, index color, and all the other settings you can put a file into. Let's stick to RGB abd CMYK.)

Printing on a press, or a pro inkjet, is done in CMYK because the inks are cyan, magenta, yellow and black (black ink is also called "key") and if you set your Photoshop separation settings up right, you can convert a file to CMYK and have a very good idea of what it'll look like on the sheet.

If you send an RGB file through your system to your imager, one of three things will happen; which one happens depends on your system.

On a very old system, there won't be any colorspace conversion and you'll get a grayscale photo where you thought there was supposed to be a color one.

If you have a newish system that automatically converts RGB to CMYK, and you've got it set up right with the exact ICC profiles you need and you have really good color-corrected art, you'll get a result that will look good. Most of us don't have it like this, because most of us separate the art in Photoshop.

If you DON'T have the system set up like in the last paragraph, the system will convert art from RGB to CMYK but the finished product will be dull and lifeless.

So...in relation to the printing process, RGB means Bad News if it gets all the way to plate that way.

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13y ago

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RGB is specifially suited to computer screens or televisions, it is not for printing.


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