Screen printing is very different from regular litho printing. You'll need...
Ed R. from CA, using Photoshop 6.0 with Mac, writes in with:
[Quote:] I want to screen print my image and the 4 color process is too splotchy. I would like to create a 6 color process. Can I copy or duplicate any of the channels?
We assume you're talking about Serigraphy (Silk Screen Printing)
If your fabric and film holds the dot for 4-color process, you can "help" mend the splotchy-ness of the image by:
a) using transparent inks specifically formulated for process color screen printing. Ask your supplier for NAZDAR inks for this purpose. Also get a quart of transparent medium because you may want to further blend your inks for more transparancy. Remember that fabric really soaks up the inks and, in effect, gives severe dot mashing or what's called "dot gain."
b) Change the screen frequency and angle. Screen printing also requires slightly different angles. You'll need to experiment with the screens and your fabric selection. (Screens and the "weave" of the fabric set up moirae patterns.
c) Convert the art to flat (or flatter) colors.
If you wish to experiment with a 6-color image, that's all well and fine, and will probably produce a more dramatic, and therefore more dynamic image.
Our favorite method is through selective posterization. But it takes a great deal of experimentation and discretion when preparing the image -- and that's more or less beyond the scope of this blog because we don't have the image.
Basically begin rendering the image to its basic and fundamental 6 colors by using the Posterize effect and dialog:
Choose Image > Adjustments > Posterize and ask for 6 levels.
Depending on how it turns out, you'll have to do this again and again until you arrive at the combination you like. Once you've posterized the image to your satisfaction, use Select > Color to select each of the 6 ranges, and assign them to a separate color channel for output to your final film positives.