Click back on the main design window and create a new layer directly below the outline layer called bitmap and change the blending mode to Multiply. Paste your new bitmap shadow.
Now hide your original shadow layer by clicking its eye symbol in the Layers palette (don’t delete it, in case you decide to create a different bitmap fill). Now merge both the outline and bitmap layers together by selecting both the layers and choosing Layers > Merge Down (Cmd/Ctrl + E) and change the layer’s blending mode back to Multiply.
We are including our own registration marks, which will help align the art properly when it comes to printing so the colours ‘register’ or match perfectly. This is a simple grid made up of four squares. The grid is drawn in a three-pixel line on the outline layer, and the blocks that fill the holes in the grid are drawn on the colour layers.
Now it’s time to create colour separations. To create colour separations ready to print we change the colour of each ‘colour’ layer to black, at 100% opacity. Choose Image > Mode > Greyscale and tick Don’t Flatten. Now use the Levels feature (Image > Adjustments > Levels or Cmd/Ctrl + L), select the black colour droplet, and click on each colour fill except the highlight layer to change them to absolute black.
The file is now ready for output. Print out your separations on film for best results. Most laser printers are able to print on acetate or OHP transparencies that are acceptable for screen films. Turn off all layers except the one you wish to print and the highlight layer, then print. Now, turn that layer off and turn on the next layer for printing. Once they’re all printed, tape them to a window one by one, making sure they all line up correctly, and making sure they’re 100% opaque black. Now, you’re ready to make screens.
Who: Nottingham-based Waste is an award-winning design studio. It works with design, illustration, typography and mixed media on projects including print, fashion, web, advertising and packaging. Clients including Tommy Hilfiger, Burtons, Old Navy, Pierre Cardin, Henri Lloyd, and many more.
Software: Adobe Photoshop, Adobe Illustrator
Tutorial files: The resources for this tutorial can be downloaded from here
Time to complete: Three hours