After mastering colour separation in Photoshop I needed to print my positives. Apparently to successfully screen print from a photograph you need to use a low resolution printer. The gray tones are made from tiny dots, and if you use too high a resolution then you'll have problems with bleeding. Ideally you need to use a 300 dpi printer but the ones in the mac suites only go down to 600 dpi.
Consequently, you can alter this manually on Photoshop by going to Filter > Pixelate > Colour Halftone..
I really like the effect created by the exaggerated halftones, so I've decided to try out both a realistic approach and an experimental, abstract one.
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