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How to create PNG with Alpha channel?

06 March 2016 14:13 #8029
How can I create PNG with Alpha channel?

On Creating an Animated Tortoise Part 1,

In order to optimize memory usage we packed the diffuse map and the specular map into one image (the specular map is in the alpha channel).

So I tried to create Alpha channel using photoshop and save as PNG file but it does not support saving Alpha channel.(8bit, 16bit, 32bit)

How did you guys create PNG contains Alpha channel?
06 March 2016 20:33 #8033

How can I create PNG with Alpha channel?
Here how you can do it with GIMP
https://www.youtube.com/watch?v=pGPJhT5lUpE
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