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>>> RGB vs. CMYK? <<<
RGB stands for Red Green Blue or the 3 colors used to display images on your computer screen.     However, ALL images and artwork must be converted to CMYK format [(C)Cyan (M)Magenta (Y)Yellow and (K)Black]in order to make color separations and film outputs for 4 color offset printing. Simply convert the images to CMYK using Photoshop's "Mode" feature. (click eHelp for helpful tips and to chat with a graphic designer.)
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