Composite result ignores Alpha I've given to it (Solved)

I want to separate image into “slices” based on Z-depth for some artistic effect. Flat colored test works:

But somehow, when I assign the render result to Image output, it overrides the alpha mask. More precisely, it gives areas which are supposed to be transparent partial opacity. Why this happens?

hi,

did you mean it like this

slice

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In your example, can a color in Image2 slot be fully transparent?

alpha would be in - that should work

slice

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Okay thanks. It turned out that I didnt understand how Alpha works in the composer at all. Used Set Alpha node as you did and it seems to work.

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