Take white background out of image with cycles?

Question

How can you take the white background out an image texture in the cycles node editor?

Here's the image I found on the internet:

the image I'm using

What I want to do is add scratches but have a different colour/texture underneath the scratches. Here's my current node setup:

nodes

Could you upload an example of the image in question? I assume there is no alpha channel? — gandalf3, Mar 29 '15 at 07:35
Thanks :) Btw, how do you plan to use the image? (In what way does the background need to be removed?) Perhaps a screenshot of your setup so far would be helpful.. — gandalf3, Mar 29 '15 at 07:39
To do that, all you need is to plug the texture into the mix factor — gandalf3, Mar 29 '15 at 08:00

score 5 · Accepted Answer · edited Apr 13 '17 at 12:57

5

To do that, you can use the grayscale map as the mix factor.

To mix colors:

enter image description here

Or shaders:

enter image description here

The color ramp node is only there to get rid of jpg compression artifacts.

edited Apr 13 '17 at 12:57

Community

answered Mar 29 '15 at 08:23

gandalf3

score 1 · Answer 2 · answered Mar 29 '15 at 15:16

1

You can use the Color MixRGB node in Multiply mode, the white information of your image will be ignored:

enter image description here

answered Mar 29 '15 at 15:16

2 Answers2