![]() act format, the specification is buried on this page) before you hit OK. To make your life easier, Save the color table for next time (in. Do this 7 more times (I know, it’s tedious) and you’ll have a full 8-bit palette. Then enter the Red, Green, Blue values of the first color (178, 24, 43 in our example), hit return, then enter the second color (214, 96, 77). Starting in the upper left, click and drag to select two rows, representing the first 32 colors in the palette. This will bring up the Color Table window. Then select Image > Mode > Indexed Color. To convert the discrete colors from Color Brewer into a smooth 256-color ramp, import an 8-bit grayscale image into Photoshop. We need 9 colors because there are 8 divisions between each specified color, which divides evenly into the 256 available indices. To build an indexed palette (also called a color look-up table), start with one of the 9-color Color Brewer palettes. Similar techniques should work with the GIMP and other applications. In Photoshop, there’s two ways to do this: create a custom indexed color palette (good for 8-bit data, with a range of 256 values), or create a gradient map (useful for applying color to 16-bit datasets). Each color has to be specified manually, and then the individual steps need to be blended (at least if you want a smooth ramp). If you don’t use software that comes with the Color Brewer palettes ( Adobe Photoshop, for example), using the tables can be a bit tricky. The widely-used Red-Blue divergent palette on Color Brewer. The Color Brewer Palettes are also implemented in visualization applications and languages like D3, Processing, R, ArcMap, etc. Cynthia Brewer’s tool is popular for a reason: it explains the theory behind palette design, provides excellent examples to get started with, and even displays the palettes on a sample map. Knowing what makes a good palette for visualization, how to find and apply good examples, or create one from scratch? In my mind the best place to start is Color Brewer. Tools & Techniques: the Nuts and Bolts of Designing a Color Palette
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