Postby Esoteric » Fri Sep 10, 2004 11:52 am
RGB means Red-Green-Blue and refers to those color lightwaves. Although they do make (expensive) RGB printers, RGB is primarily a color mode used only for TV and computer screens, and is not generally associated with printing.
CMYK means Cyan-Magenta-Yellow-Black and refers to the colors of ink used in most printers.
The two primary methods of T-shirt printing are screenprinting (or silkscreening) and CMYK printing. Since CMYK uses a printer to blend four colors of ink, it can be expensive. Screenprinting is far more common, and typicaly uses only one or two colors of ink, called spot colors. Spot colors can be whatever... blue, red, pink... doesn't matter, but it's much cheaper to produce because the inks aren't being mixed to create an entire color range, like they are with CMYK.
With all of the colors in your design, and no color separations (technical jargon), you would have to go with CMYK.
If you'd like to do more t-shirts designs, you should research the various printing methods. It's interesting stuff.