tailieunhanh - How to Do Everything With Your Scanner- P25

How to Do Everything With Your Scanner- P25: My thanks to the terrifically creative and knowledgeable staff at Osborne, particularly acquisitions editor Megg Bonar and acquisitions coordinator Alissa Larson for their responsiveness and flexibility. Special thanks to technical editor Steve Bain, not only for his insight and attentiveness to accuracy, but also for actively coming up with many ideas for content. | 104 How to Do Everything with Your Scanner How To. Recognize line art grayscale and different types of color images Clearly scan line art Capture a grayscale image to its best advantage Scan vibrant color images Human beings have an instinctive desire to produce images. Only a couple hundred thousand years after our ancestors first began scrawling on cave walls our species has evolved the ability to reproduce digital images with scanners and PCs. Images captured in digital form fall into five general categories line art black and white color half-tone and text. This chapter tells you how to recognize and differentiate different types of images and how to adapt your scanning techniques to best capture them. Overview of the Different Types of Images If you re serious about scanning you need to know about the different kinds of originals. There are five types of images you can expect to be working with Line art Line art is an image consisting of a single color such as black against a single-color background such as white or vice versa. The term is a little misleading because the image doesn t necessarily need to be lines. For example a solid black circle on a uniform white background is considered line art. Figure 6-1 is an example of line art. Grayscale A black-and-white photo like most of the figures in this book is an example of a grayscale image. A grayscale image appears to have smooth continuous shading gradations ranging from black to white with all the shades of gray in between. Color When graphic artists refer to a color image they usually mean an image such as a photograph or transparency that s made up of a continuous range of color tones. Half-tones When you scan a photograph that s been printed in a color magazine or newspaper you re actually scanning a type of image called a half-tone. Color photographs are reproduced on a printing press using a process called half-toning in which continuous tones are translated either manually or digitally into a matrix

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