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I tried to create a transparency but couldn't get it work. What is that I did wrong? :) The black background is still there and not getting transparent. I also tried to invert the shaders in the mix shaders but then averything disappears, even the white and red surfaces.

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  • $\begingroup$ Try duplicating the image node and setting it to Non-Color for the alpha channel. Also, if you could, it would be a lot more helpful to have a picture with the alpha channel going straight to the color node on an emission shader that goes to the surface input. Otherwise, it'd be nice to see a .blend. My guess is that the alpha channel isn't really changing across the texture. $\endgroup$
    – JakeD
    Aug 15, 2016 at 11:21
  • $\begingroup$ I only add to "pycoder" comment: It look like there is no alpha channel in image. This also happen when you use "Image as Plane" addon and you don't check "use alpha" in import settings. $\endgroup$
    – Shubol3D
    Aug 15, 2016 at 11:32
  • $\begingroup$ @Pycoder, Shubol, I tried these but still didnt get it right. I also added the files in the post. My picture is a png but without an alpha channel in it, only black to be converted as alpha in blender, I tried with import as plane, check "use alpha" but what I need is that Blender interpret my black surfaces as transparent somehow. $\endgroup$
    – TomCG
    Aug 15, 2016 at 13:03
  • $\begingroup$ @TomCG please pack the image that you are using into the blend file and upload the file again. $\endgroup$
    – user1853
    Aug 15, 2016 at 13:14
  • $\begingroup$ @TomCG please read this link: blender.stackexchange.com/questions/27633/… $\endgroup$
    – user1853
    Aug 15, 2016 at 13:15

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Your alpha channel is mostly white. try to make it better or use this trick to use the black color as black alpha.
enter image description here

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