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Author: Jose Fernando | Website:

Channel Manipulation

The previous Channel Filtering is nice, but the result is not so good. The sharp-eyed ones will note than the final image is not so good-looking. Since you cut some channels off the image loses a bit of its quality - the contrast and the final "curves" of the image are lost and it gets a bit darker.

But beyond Channel Filtering, there is lots of manipulation you can do using math. Let's, for example, try changing all the channels at once. Try these values:

Channel % Value Additional Value
Red 200% 0
Green 200% 0
Blue 200% 0
Alpha 100% 0

This will make the image brighter - it's almost the same as making the image contrast and brightness higher on Photoshop. Note: the % value slider can't reach 200% (it only goes from -100% to 100%), but you c an still select 200% if you type 200 in the editing field!

The good thing is that this "special" color effect is applied "on the fly", that is, it leaves the image "as is". You can even make some nice animation. For example:

The above is an animation where the channels' % value range from 0% to 600% and 0% again. And it is still almost the image size - 8kb!

» Level Intermediate

Added: 2000-12-04
Rating: 9 Votes: 258
(10 being the highest)
» Author
Jose Fernando is a technology child, works as a designer, lives in Brazil and watches lots of Anime videos
» Download
Download the files used in this tutorial.
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