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Photoshop CS3 for Screen Printers- P11: The toolbox is the heart of Photoshop CS3, and where you’ll find the tools you need to create your artwork and perform editing tasks. From the toolbox you can access the selection tools, shape tools, type tools, Crop tool, and eraser tools. These are basic tools that any screen printer or graphic artist needs. | 276 Part III Working with Client Files 3. Open the Curves dialog box using Image Adjustments Curves or Ctrl M. See Figure 14-8. Figure 14-8 Using the Curves dialog box 4. Open the Info palette. 5. In the Curves dialog box choose a channel to change. For instance if the scan has a red cast choose red and adjust the curve. Perform the same steps for the other channels. You can even try adjusting the RGB channels together by choosing RGB from the Channel list. The object is to get the numbers for pure black and pure white as close to perfect as possible all 0s and all 255s . Tip This takes a little practice and you might not get it perfect right away. Don t get discouraged. Remember you re trying to get rid of any colorcast or tint that your scanner applies. This can be done with the Curves tool it just takes time. 277 Chapter 14 Acquiring Files from Scanners 6. Between adjustments use the Eyedropper tool to see the before and after numbers for the pure white that you are testing. The first number in the Info palette is the before number and the second is after. You can perform the same functions on pure black as well. 7. Once you ve gotten the numbers close to 0s and 255s click Save. 8. Save the curve as Scanner Calibration. 9. You can test what you ve done by rescanning the step wedge applying the curve and retesting the colors. You might have to do this a few times to get the adjustments just right. The next time you scan apply the saved curve to the scanned image. Hopefully your scanner is a nice piece of equipment and you didn t have to do too much calibrating and tonal curve reworking. If you did happen to find out that your 19 scanner is a dud you are at least aware of the problems and can adapt your work accordingly. This might involve purchasing a newer and better scanner too Tips for Scanning a Photo or Line Art If you worked through the calibrating exercise you have already used the scanner. Chances are you ve already scanned other items as well. In this .
