RGB is for viewing and CMYK is for printing.

Color Modes and When to Use Them:

Bitmap: 1-bit color. Pixels are either black or white. Good for simple line art with no shades of gray, no fuzzy edges. If you are saving to EPS format, remember to check for “Transparent Whites” if you want the black areas to be solid but the background to be “clear.” Be VERY careful messing with the Halftone Screens. If you want a cool T-shirt, silk screen effect, go for it, otherwise be prepared to see you work mangled beyond belief. To make this format more workable, you can convert it to Grayscale (then to duotone, or CMYK or RGB, etc.). If you have something in another format you have to convert it to Grayscale first, then Bitmap will become an option. Bitmaps are good for line art, doesn’t always need trapping, and can be colorized in programs like PageMaker into solid inks.

Grayscale: 8-bit color. Pixels can be black, white, or any one of 256 shades of gray. Good for black and white photos and illustrations. Full color images can easily be converted to grayscale for publication. (But if you want to see a full color–CMYK or RGB image as a grayscale, without actually converting it.


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