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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

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  • $\begingroup$ Could you upload an example of the image in question? I assume there is no alpha channel? $\endgroup$
    – gandalf3 ♦
    Mar 29, 2015 at 7:35
  • $\begingroup$ @gandalf3 editing the question so it has the image $\endgroup$
    – Chickenator
    Mar 29, 2015 at 7:37
  • $\begingroup$ 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.. $\endgroup$
    – gandalf3 ♦
    Mar 29, 2015 at 7:39
  • $\begingroup$ @gandalf3 added some more infomation $\endgroup$
    – Chickenator
    Mar 29, 2015 at 7:44
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    $\begingroup$ To do that, all you need is to plug the texture into the mix factor $\endgroup$
    – gandalf3 ♦
    Mar 29, 2015 at 8:00

2 Answers 2

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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.

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

enter image description here

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