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, 2015 at 7:35
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, 2015 at 7:39
To do that, all you need is to plug the texture into the mix factor — gandalf3, Mar 29, 2015 at 8:00

Community · Accepted Answer · 2017-04-13 12:57:42Z

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.

CommunityBot

1

answered Mar 29, 2015 at 8:23

gandalf3♦

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user1853user1853 · Accepted Answer · 2015-03-29 15:16:19Z

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, 2015 at 15:16

user1853

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