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I'm just about bald from tearing my hair out, but I think I'm finally closing in on successful quadtones with my 740. Many thanks to all on the list - some I've managed to respond to and thank, some not (just reading the traffic takes a whole lot of time, let alone responding). My method is a hybrid of Dan's RGB approach and the custom separation process Strange posted a while ago, although I kinda butchered them along the way. What I ultimately did was take the purge4.tif file from MIS (just solid bars of C, M, Y and K), and throw a gradient screen over them (0-100%). I then printed this, and scanned the result. A bit of inspection and blurring of the resulting image allowed me to visually select the most linear portions of each ink, and manually match them into a reasonable grescale ramp. It's still not perfect, given the almost unbelievably primitive curves editing interface in Photoshop, but it looks to be _very_ close. I still haven't worked the 25% ink into the picture as much as I'd like, but the 50% does remarkably well in the highlights. There's no hope of accurate visual preview, and I'm simply using linear segments for each ink (no overlap between inks) for now. (and even that was hard enough to tweak into a smooth set of curves) I'm printing on the recently-in-the-spotlight Heavyweight Matte paper, and I quite like the results. Warm, but not overly so, and holds detail well. I find that the 100% black ink seems to give better blacks than on any of the other papers I've tried. With regards to the curve editing issue - is this just my lack of knowledge of photoshop? I realize that 99% of the time, the curves tool is used in line/smooth mode, but for manual seps you have to use the pencil mode. Are there ways to zoom or magnify that I don't know about? Barring that, is there any other way to generate the curves? A plug-in or documented file format? At the moment, I'm thinking that simply writing a program to read in a greyscale tiff and spit out an RGB tiff might be the easiest approach..... Once again, thanks to all fellow quadtoners for the advice picked up. Doug Kelly - Please turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for instructions.
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