A trap can be as small as 2 points for shops that can hold tight registration, or as big as 6 points for simple images on low-end equipment. Trapping is the overlapping of darker colors (like black) on top of undercolors. If your “films” are output on a laser printer, they many never line up. When printing spot colors, any out of registration will show up as gaps between colors. The funny thing about printing shirts is that sometimes spot color images where colors touch colors are often HARDER to print than photo realistic images made up of halftone dots. Vector based programs like Corel Draw, Adobe Illustrator and Macromedia Freehand are generally used for spot color images or images with a hard edge and more of a cartoon look. Others are just good nuts-and-bolts suggestions that can make or break a set of seps. In order to fit this in the allotted space, many tips are brief suggestions that will require referring back to your software manual to figure out. This article lists a few quick tips for better separations and art output which leads to better prints. – but it all starts with color separations. Yes, yes, you need to use properly tensioned screens, good press setup, proper ink viscosity, etc. As you become a better printer, it doesn’t take long to learn that in most cases if the separations are done correctly, the print looks great. Over the years I have learned that one of the major secrets to good screen printing is good color separations.
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