February '21

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G R A P H I C S - P R O. C O M 2 0 2 1 F E B R U A R Y G R A P H I C S P R O 5 5 TUTORIAL Following, I describe how to use software to create film positives. All you need is a computer, graphics software like Photo- shop, an inkjet or laser printer, and some printable transparent film, which you can purchase anywhere; I found it on Ama- zon (Figure 4). I'll present three different sce- narios for single-color, multi- colored, and photographic im- ages. Single-Color Print Start by creating or scanning your illustration into the soft- ware. You can assign a color to the image to see what it looks like on screen. Before printing, though, you'll change the color to black. Print the black image to a piece of transparent film and violĂ ! There you have it. Multi-Colored Print When there is more than one color to the illustration, mul- tiple film positives are made in order to burn each color to a separate screen. If the colors do not overlap, design the image so that the colors butt against each other with a one-point overlap (called a trap). Each color should be on a separate layer and la- beled with the color's name. Create registration marks that align on each layer so that when the prints are made, each screen can be precisely aligned for perfect registration. Select the content of each layer and fill it with black. Then print each of the black layers onto a sepa- rate film positive by printing the contents of one layer at a time. In Photoshop, you can do this by simply concealing all of the layers in the Layers panel, except the one you want to print. Figure 5 shows how a three-color illustra- tion is structured. Photographic Print A photographic screen print is a little different in that you'll create four half- tones, called a color separation, one for each color in CMYK color mode. You'll need to separate the colors before making the film positives. First convert the image to CMYK (Image>Mode>CMYK). Then look at the Channels panel. You'll see five channels representing the four colors cyan, magenta, yellow, and black and the full- color composite channel (Figure 6). These can be printed individually on your inkjet or laser printer, but it's much easier to go to the Print menu and choose separations from the Color Handling menu. At the bottom of the screen, you'll see Figure 8. Artists such as Andy Warhol have used screen printing as an expression of creativity and artistic vision. This is a famous multicolored screen print of Marilyn Monroe circa 1967 with four variations by Andy Warhol. LEARN HOW TO CORRECT ARTWORK TO MAKE IT SEPARATION READY WITH THIS QUICK TIP: continued on page 94

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