Color channel map

[Shimakaze]

Has anyone ever come across a map that would let you split a RGB picture into individual grayscale pictures? somewhat similar to the ColorReplace map but actually splitting the channels rather then performing keying?
If not, it doesn't sound like it would be very hard to make.
Just a map where you could select an input texture, and choose red, green or blue and the map would extract just that channel as a standard greyscale picture... Would be very useful for masks...

[vlado]

Hm, RGB Tint? To extract the red channel, for example, set the red color swatch to white, and the blue and green ones to black.

Best regards,
Vlado

[Shimakaze]

I tried that one as well but it doesn't seem to give perfect results either, when comparing it to the same color channel saved out from Photoshop.