TAILIEUCHUNG - Photoshop CS3 for Screen Printers- P18

Photoshop CS3 for Screen Printers- P18: 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. | 486 Part V Color Separations DCS is supported by several other programs including Adobe PageMaker Adobe Illustrator and QuarkXPress. If you are preparing an image with spot colors for printing from another application consider unchecking Include Halftone Screen and select Include Transfer Function. Resolutions A big part of successful color separations and screen printing is working with the right resolution. Different types of resolution have been introduced briefly in this book in various chapters and for various hardware and software but you need a firm grasp on the concept to truly understand the importance of it. Image Resolution When an image is printed an image with a high resolution contains more pixels than a low-resolution image and the pixels are smaller. Consider this A 2 inch by 2 inch image with a resolution of 72 dots per inch creates 144 pixels by 144 pixels 20 736 pixels. The same 2 inch by 2 inch image created and printed at 200 dots per inch creates 400 pixels by 400 pixels 160 000 pixels. At 600 dots per inch this escalates to 1 440 000 pixels. Because there are more pixels created for the same size image the image will print out with more detail than a low-resolution image. This is why low-resolution images get a pixelated look. You can actually see the pixels on the page making low-resolution prints difficult to work with at the press. In contrast using a resolution too high for the output device or substrate that it is printed on is a waste of resources and time. The object of course is to find a happy medium. Note Image resolution is measured in pixels per inch ppi . 487 Chapter 26 More about Color Separations Printer Resolution Printers can print in many different resolutions and the resolution quality is generally proportional to the price of the printer. Wide format thermal imagesetters usually print at resolutions between 400 dpi and 1200 dpi to 2450 dpi and higher depending on how much you invest. The technology is always growing .

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