uncleflo
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Tag selected: luminance.
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Convert color to grayscale
Saved by uncleflo on March 12th, 2012.
Colours in an image may be converted to a shade of gray by calculating the effective brightness or luminance of the colour and using this value to create a shade of gray that matches the desired brightness. The following code snippet isn't really a good example of how it should be done in a production situation but it does show the principles involved clearly. For every day use. see the ColorMatrix example below. The effective luminance of a pixel is calculated with the following formula: Y=0.3RED+0.59GREEN+0.11Blue This luminance value can then be turned into a grayscale pixel using Color.FromArgb(Y,Y,Y). Converting an image from colour to monochrome can be performed using the following code.
development formula ratio color luminance grayscale convert graphic information
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