June 23rd, 2007, 08:07 AM
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Senior Member
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Re: Cmyk Separation - What Colour Tones
Hi Bruce,
The tones of ink you use for process printing are already mixed. Wilflex, to me, makes the best process inks, followed closely by, "if not just as good", Rutland and Union.
The inks are semi-transparent so that light passes through them and bounces back off the white underneath making you think you see color. So there are no "real" colors, just half-tones set at different angles. For instance: Cyan and Black may be preset at 45 degrees and yellow at 15 and magenta at 65. Just let Corel or Photoshop use their calibration with the printers settings, all you need do is worry about the artwork looking good.
Stay away from RGB, as separating four-color-process in that format will give you a slight off-color. Convert it to CMYK before making your separations so that the outcome is as close to the artworks color as possible. Panatone colors are simply solid color, but can be broke down and reproduced by printing four-color-process.
You mentioned just sticking with Photoshop, I have used both programs for separations and found that Corel Draw works the best for screenprinting. Some will argue, but it just comes down to the users preference. So use what you feel comfortable with.
As far as printing oil on canvas, I don't know if it can be done. The oils would have to be thinned down to be semi-transparent and the surface of the canvas is rough. The uneven surface will cause ink build-up in the valleys and dot gain on the ridges. So it would be impossible to get the colours right. The prints sold in stores done that way are printed on flat stock then pressed on a mold to give it that canvas look.
Hope this helps.....................
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