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Chapter 23. WEB/IMAGEREADY > Optimizing images for the Web using ImageReady

Optimizing images for the Web using ImageReady

Optimization is the process by which file format, storage size, and color parameters are chosen for an image in order to maximize its quality, yet still enable it to download quickly on the Web. While an image can be optimized in Photoshop 6 via the File menu > Save for Web command (a one-stop optimize dialog box), we think the better approach is to Jump to ImageReady and use the various palettes in ImageReady for optimization, because they offer more options.

Four of the GIF color palettes

Note: What Web designers commonly refer to as "color palettes," ImageReady tool tips calls "color reduction algorithms" (huh?).

Perceptual

Generates a color table based on the colors currently in the image, with particular attention to how people actually perceive colors. This table's strength is in preserving overall color integrity.

Selective

Generates a color table based on the colors currently in the image. The Perceptual and Selective options are similar, but the Selective option leans more toward preserving flat colors and Web-safe colors.

Adaptive

Generates a color table based on the part of the color spectrum that represents most of the color in the image. This choice produces a slightly larger optimized file.

Tip

If you switch among the Perceptual, Selective, or Adaptive options, any Web-safe colors that are currently on the Color Table palette are preserved.


Web

Generates a color table by shifting image colors to colors that are available in the standard Web-safe palette. (In order to create a palette that works on both platforms, since the Windows and Mac browser palettes share only 216 out of 256 possible colors, the palette contains only 216 colors.) This choice produces the least number of colors and thus the smallest file size, but not necessarily the best image quality.



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