OK, if you’re like me than this handy bit of info will be amazing to you.
How to Silkscreen CMYK images (a quick outline)
The screen class here has done some extensive testing and have come up with a good set of parameters. This info is from Chris Dacre’s silkscreen class here at IU.
Open you image in Photoshop
Make sure to change the color mode to CMYK (Image > Mode > CMYK)
Open your channels tab and from the channel tab options menu choose > Split Channels
This will open four new files, one for each color you will be printing
Then you need to make each of those four files into a bitmap image.
For each file go to Image > Mode > Bitmap and a dialog box will open
You want your output setting to be approx equal to 200
Your Method = Halftone Screen
Frequency should equal a number somewhere around screen mesh count/3.5
Angle – so, to avoid moire, your dot angle should be different for each color you are printing. Here are the angles that the class used with success.
M=15, K=45, C=75, Y=105
So if you have your black image open set the angle amount to 45 etc.
When you have all four images/layers bit-mapped print them out. Be sure to print registration marks on your images.
We use pin registration here in the studio, so our registration is pretty spot on. But you need the reg. marks on your films to get them lined up.
When printing the class found that 30% trans in CMY works pretty well, and printing K at 50/50 trans base makes for a realistic look. We use Jacquard inks.
Anyhoo – I’m pretty stoked about their success. They devoted a lot of time to trial and error in the process of figuring this out. I’ll get some pics of their prints up soon.