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Chapter 5. Adjusting Color > Color Calibration

Color Calibration

The first step in color correcting your images is to calibrate all the devices used to capture, display, and output those images as well as you can. The goal is to provide some sort of relationship between the original image, the modified image in Photoshop, and the final image on the printed page. One problem, as we’ve seen, is that the color model used to capture and display images (RGB) provides a different color gamut than the model used to print images (CMYK). Add to that the difficulties of scanners and digital cameras that have their own notion of how colors should look, video displays that add their own bias, and printers that don’t necessarily print colors in the exact relationships they should.

And there’s more (as if you had to wonder). The response of any color system is rarely linear. Consider a color monitor as an example. Given 256 possible shades of a particular red, green, or blue color, you can safely assume that a value of 0 will be represented as no color at all, and a value of 255 will be shown as the maximum intensity of that color, given the limitations of the display itself. So far, so good.


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