Color Manipulation, Channels, and Layer Modes CHAPTER 8 (Medical web site)
Color Manipulation, Channels, and Layer Modes CHAPTER 8 In earlier chapters, you learned how to do simple color correction: how RGB and indexed color differ, and how to change the foreground and background colors in the Toolbox. But a deeper understanding of the GIMP s color model can illuminate all sorts of useful image-processing tricks. In this chapter, I ll describe the way the GIMP represents colors, different color models, and techniques to manipulate colors. Understanding color requires a more theoretical approach than you ve seen so far. A familiarity with color implementation in digital images is helpful to understanding the sorts of advanced tricks that can be played. If you feel overwhelmed by the theory, you can skip those sections and use this chapter for reference when you have questions about color. Later chapters will not require an understanding of color theory, though some of the techniques covered here will help in other projects. This chapter will cover the following: A review of RGB and CMY color Working in HSV Working for print: CMYK GIMP s alternative color choosers Working with grayscale or black and white Coloring monochrome images and making sepia photos Using the Threshold tool to clean up black-and-white scans Indexed color Picking colors from the image The color channels How to use color decomposition Color profiles
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