Photoshop CS3 for Screen Printers- P11

Photoshop CS3 for Screen Printers- P11: The toolbox is the heart of Photoshop CS3, and where you’ll find thetools you need to create your artwork and perform editing tasks. Fromthe toolbox you can access the selection tools, shape tools, type tools,Crop tool, and eraser tools. These are basic tools that any screen printeror graphic artist needs.
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Photoshop CS3 for Screen Printers- P11276 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. Chapter 14 / Acquiring Files from Scanners 277 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, apply- ing 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 pur- chasing 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 section, I won’t go through all of those steps again, but I will summarize what you’ve learned so far, including some tips and tricks and what you should do each time you scan. n Make sure the scanner glass is clean at all times and the top shuts all the way. n Use File>Import to select your scanner so that you can scan directly into Photoshop. n Scan photos at 300 dpi. n If you get moiré patterns, try 200 dpi, or use a “Descreen” option if one exists and scan the image at twice the final size. n Scan line art at 1200 dpi. If the computer freezes up, switch to 600 dpi.278 Part III / Working with Client Files n Preview the scan first, and then drag a rectangle around the part you want to scan. This will take less RAM than scanning the entire space if it isn’t needed. n Use RGB color mode for color scans. n Choose the type of image from the Image Type choices (black and white, line art, color photo, black and white photo, etc.) n Set the output size to the size you want the image to be. It is better to have the scanner upsample the artwork than it is to have Photoshop upsample it. n Save the file immediately after the scan as a PSD file. n Apply your saved curve after the scan has been opened in Photoshop. n Crop any excess from the scan using the Crop tool. With the image scanned and saved, you can begin working with the image. What if File>Import Doesn’t Work? There’s a slim chance that the File>Import command won’t work with your scan- ner. If this is the case, you’ll need to use your scanner’s software to scan, save the scan to the hard disk, and open it in Photoshop. To do this: 1. Open the software that came with the scanner. 2. Choose File>Select Source (or something similar) and choose the scan- ner from the list. 3. Choose File>Acquire (or something similar) and scan the image as detailed earlier using the tips listed above. 4. Save the file as a TIFF to your hard drive. 5. Open Photoshop and choose File>Open As. 6. Browse to the location of the saved file and click on it. 7. Open the file as a PSD file if possible. If not, open as a TIFF. Chapter 14 / Acquiring Files from Scanners 279Project 14-2: Scanning and Enhancing the Scanned ImageIn this project we scan a photo using the correct settings, using the tipsand tricks mentioned earlier, and save the image to the hard disk. Withthe image saved, we then learn to enhance the image using Photoshop’sbuilt-in scanning improvements.1. Choose a photograph to scan and place it on the scanner. Close the cover.2. Choose File>Import and choose the scanner.3. Using the dialog box that appears for your scanner, choose RGB Color mode at 300 dpi. Choose Color Photograph from the list, and uncheck any items that will automatically sharpen, blur, or cre- ate color. Click on Preview to create a prescan.4. Drag a rectangle around the area to scan.5. Configure the output size so that the scan created is the size of the file that you want to work with. Sometimes, this requires typing in an actual size, such as 8 x 10 inches; other times you need to choose 150 percent, 200 percent, or 300 percent to increase the size.6. Click the Scan button. After the scan is complete, you might have to click Exit or Close in the dialog box.7. Choose File>Save As. Save to the ...