How extract color channel from Image Texture?

[R_Flash]

Hi. Need a help. I have simple material with image texture in diffuse channel, but I need to extract Green Color channel from this texture for use as a mask in a Normal channel. Thanks!

[bepeg4d]

Hi,
I think that the faster way is to get the green channel in PS or GIMP and use it in the amount channel of a mix texture node
ciao beppe

[R_Flash]

Hi,
I think that the faster way is to get the green channel in PS or GIMP and use it in the amount channel of a mix texture node
ciao beppe

Yes, but I need extract different channels from one texture for economy VRam memory, because I have big 8K textures. And adding each additional image to project will "eats" 256 mb of VRam.

[bepeg4d]

Ok, now is more clear why you need this, here is a possible solution, I have not played a lot but i think you can get what you want in this or similar way

ColorExtract.zip

(535.29 KiB) Downloaded 161 times

ciao beppe

[R_Flash]

Ok, now is more clear why you need this, here is a possible solution, I have not played a lot but i think you can get what you want in this or similar way

ColorExtract.zip

Schermata 2015-07-07 alle 16.16.15.jpg

ciao beppe

Thanks a lot . I will test this method.

P.S. I find another method,but it has a big disadvantage. It uses C4D shader "Filter".