CHAPTER 2 IMPROVING DIGITAL PHOTOS Tip Threshold
CHAPTER 2 IMPROVING DIGITAL PHOTOS Tip Threshold is particularly useful for scans of printed text documents and line art. If you end up with a few extra speckles of the wrong color, you can clean them up afterward using the GIMP s drawing tools (see Chapter 4). Posterize (Figure 2-22) reduces the number of colors in the image, creating a gaudy display like you might see on an artistic poster. You can achieve a similar effect by converting an RGB image to indexed mode, but posterize is a quick way to achieve this effect, and it still leaves you with an RGB image in case you want to do further editing. The effect is most obvious when you use a very small number of colors. Figure 2-22. A posterized image
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