![]() Uncoated profiles are usually less, Uncoated GRACoL is 280%. US Sheetfed is 350%, US Web Coated SWOP is 300%. Total Ink drying problems are only a problem with 4-color printing-there’s no way black only at 100% should cause drying problems-if it did you wouldn’t be able to print 4-colors.ĬMYK profiles limit ink on a color conversion-typically coated sheetfed profiles limit total ink to between 300% and 350%. Which I've also been told can be caused by too high an ink density. Black Ink profiles tend to be more accrate through out the scale:īlack Ink - US Sheetfed Coated compensates for more gain than Black Ink GRACoL Coated, or Dot Gain 20% But the Gray profile you assign to a Grayscale image in photoshop soft proofs dot gain so there’s no need to put a limit on the black point. In fairness to the printers, most probably don’t know what the profile for a black only press run is-the profile could change depending on the amount of ink density the press person decides to run. I would ask the printer but … they are quite rarely clear or helpful on profiles. Limiting the black point of this image to 85% would only wash it out There’s plenty of range between 80 and 100%, and there is a clear difference between the 95% and 100% patch. ![]() ![]() The patches at the bottom are in 5% increments. Consider this scan of a black only image printed on coated stock from a 4-color press running to the Coated GRACoL CMYK profile: The idea is you can prevent images from going too dark from dot gain or "filling in", but all you are really doing is limiting the already limited dynamic range of a black only image printing on an offset press.ĭot gain is most noticeable in the mid range values, and a Gray profile will soft proof the gain through out the scale. That conventional wisdom originates from the 90s when there was no reliable way to soft proof profiled grayscale images. Limiting the grayscale black point percentage tops my list of printer’s advice to ignore. So far I've generally been asked by various printers to manually prevent TAC going over 80–95%
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