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graphics program Photoshop, Paint Shop Pro, Lview Pro, and other common graphics programs offer a variety of filters for removing excessive detail and color variation Some scanner software also offers descreening settings
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Usually, the fewer colors your image uses, the smaller the file If you are drawing a picture, use as few colors as possible right from the start In addition, many graphics programs let you reduce the color palette of an existing image, which is called flattening the colors Reducing the palette reduces the size of the image file, but not because the file has less palette data (Palette data is a small part of the image file) When the program removes colors, it gives the affected pixels new colors It has fewer colors to choose from, so a pixel is more likely to match a neighboring pixel s color The pixels are then part of a same-color pixel group and no longer require their own data in the file If you use a graphics program to reduce colors, be aware that how it reduces the colors is important If a program removes a color from the palette, the image file gets smaller only if the program simply reassigns the next closest color to the pixels that had the removed color If the program compensates by dithering, the file may not get significantly smaller because dithering makes pixels different from their neighbors, thus requiring each pixel to have its own data in the file Most graphics programs that offer color reduction let you choose a reduction process Look for options in the dialog box that appears when you reduce colors The process that helps to minimize file size is often called nearest color substitution The other process, dithering, goes under various names, but a common one is error diffusion
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Rapid downloading is important, but you also need to maintain a level of quality Given a certain size and content, the way to ensure quality is to choose the file format well and to control the depth and uniformity of color in the image
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The number of different colors an image file can contain is called its color depth GIF files have a maximum color depth of 256 colors, which is called 8-bit color, but can also have depths of 7 bits (128 colors), 6 bits (64 colors), 5, 4, 3, 2, or 1 bit JPEG files have a fixed color depth of 167 million colors, called 24-bit color, a depth that makes JPEG images generally better for color photographs Within a given depth, the actual number of colors used in the image (the palette) can be fewer than the color depth allows An 8-bit GIF image (256 colors possible), for instance, might use only 200 colors Today, most computers can display 167 million different colors Many older computers can still display only 256 or fewer colors, but those can be any 256 colors out of 167 million, 64,000, or some other very large number GIF images are equally flexible You (or your graphics program) can choose the 256 colors out of 167 million colors that best match the colors in your original image You
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can also choose a smaller palette or color depth to reduce file size, or choose a specific palette to better match the palette of a broad range of computer displays (as described in the following section) So-called true color formats, such as JPEG or 24-bit PCX, do not use a palette: each pixel can be any color out of 167 million However, if a computer cannot display a particular color in a JPEG image, it either chooses the closest color it can display or approximates the missing color by dithering other colors, depending on the browser To minimize quality problems caused by such compromises on older computers, you can create your image in (or convert your image to) a palette format such as GIF and then convert the file to JPEG If your web page has several images on it, make sure that all images use the same palette Computers that use screen palettes can display the colors of only one palette at a time If you have images with different palettes, you may force the computer to substitute or dither colors
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