You're extracting one of the three RGB channels.
Ian
On 29 Nov 2007, at 03:32, Mark Smith wrote:
This is sort of interesting:
if you simply take one of the color bytes of each pixel, and copy
it to the other two color bytes, you get a gray-scale result. The
brightness/contrast varies with which color you choose. For the few
images I've tried, it seems to be red =brighter/less contrast to
blue= darker/more contrast. This may be no surprise to the pro
image wranglers among us, but seemed intriguing to me.
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