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Conversion to Grayscale
Suppose you have a color image: and you want to convert it to a grayscale image. At first, you might think you you can simply add up the red, green, and blue color values, and divide by 3: Gray = (Red + Green + Blue)/3 If you do that, this is what you’ll get: That doesn’t look very good.
At first, you might think you you can simply add up the red, green, and blue color values, and divide by 3: For correct results, you need a more complicated formula: first convert to a linear colorspace, then use different weights: If your convert-to-grayscale algorithm needs to run as quickly as possible, while still giving good results, you may have to use techniques such as lookup tables to improve the speed.
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