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I searched everywhere and I can't find an answer on how to do this with Blender and Cycles:

  • I have a pre-made model with textures
  • Some materials have a Diffuse map (JPG) with a separate Alpha Map, another JPG.

What kind of texture setup do I need to make these two maps give me a texture with alpha that I can use in a Cycles material?

Thanks in advance.

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  • $\begingroup$ jpegs cant have an alpha channel. My guess is that your second jpeg is a luma map (Just black and white). $\endgroup$
    – Dontwalk
    Sep 4, 2018 at 18:41
  • $\begingroup$ @Dontwalk I think he means the alpha map came as a separate image file, rather than an alpha channel in a PNG or other supported file format. That being said the setup is no different from other transparent materials. $\endgroup$ Sep 4, 2018 at 18:46
  • $\begingroup$ @ Duarte Farrajota Ramos - He said he got two jpegs so there cant be an Alpha Channel or transparency. I'm guessing (without seeing the files) that one of the jpegs is just B&W to be used as a Mask. $\endgroup$
    – Dontwalk
    Sep 4, 2018 at 19:02

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Actually you just need to use the output of the second texture (Alpha Map) as the alpha. For example: using it as the transparency: enter image description here

Note that the Alpha is Non-Color Data

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