Hi !
Somebody know why my baket texture having some “black outlines” on, for alpha i just erase them on krita but it’s not normal…
Thanks !
Hi!
I’m assuming it’s due to Margin value in Bake options. Try setting it to 0.
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Hello ! Thanks, i’m gonna try it !
When you export as PNG in Krita, be sure to check the “alpha” box when saving.
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I tried and it didn’t work but i think it’s because i use “image as plane” and i can’t bake transparency. Thanks
Simply because baking alpha do not work at all till blender 3.2.
I wrote several topics about this in there 
What blender version are you using ?
2.8 … old computer ^^"
@Marilux_Fiorenzani 
2.8 then forget about baking alpha.
You should get the 3.2 version of blender that finally ( after 7 years of latency ) handles alpha textures in bake. And moreover, you should not see much difference between 2.8 and 3.2 execution.
And if you are on win7, you should get the 3.2 version of an angel user who recompiles blender realeases so that they run on win7
@RSEhlers:
This vid is well known as alpha baking tutorial but it don’t handle overlapping textures with alpha ( see my other post about this here for more info )
Happy blending !
There’s a relatively simple way to bake an Alpha as a separate Black and White texture: just temporary make your material white with Emission Shader and bake Emit Type onto a black image.
You can then add this image into texture’s Alpha channel by other means
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wow 7 years, soon i’ll buy a new pc ^^ Did you know where can i find the recompiles blender versions ? And i’m on windows 10 so it’s more a configuration problem
GIMP has a great BW to Alpha converter
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For beeing clear, NO, alpha texture baking DO NOT WORK before 3.2
please look at
And see that alpha texture baking DO NOT WORK !
you can bake an object to alpha texture but when you want to bake stacked objects using alpha textures blender writes the (0,0,0,1) color instead of the transparent pixels.
However i noticed big changes ( that i did not test further ) on blender 3.2 that make me say it finally works.
@Marilux_Fiorenzani :
I meant 7 years for blender team to solve this problem 
If you are on windows 10 then you don’t need the ‘hacked-for-making-it-working_on-win7’ blender version. Just go to blender.org and download the later version and install it
Then you can give a try to the 3.2 awesome baking-to-alpha of alpha objects.
@joseph :
LOL !
You are true but this workaround is just not an option
I guess it’s time for blender to handle properly simple things before it handles serious things
Happy blending !
( Started with a full PBR workflow…)
You can use the compositor to add the alpha ( MASK) to an image, for instance…
I used Roughness to Red, Metallic to Green, and Opacity to Alpha…
Render out the image to proper 1024/2048 etc…
then a split RGB will allow you to replace all 3 images with this 1…
( this is Blender 3.1RC BTW…)
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