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Post Process Render Pass
Post Process Render Passes are additional render passes you can specify from the Deferred Renderer. You must output them in the .exr format as they contain color and metadata information beyond what can be displayed and interpreted from the other formats.
Zip (16 scanline blocks)deflate compression applied to blocks of 16 scanlines at time. This tends to be the most effective style of compression to use with rendered images that do not have film grain applied.
PNG (8 bit) – This should only be used during test renders or straight to post without the options to edit. Because the PNG outputs in sRGB the file is clamped and lmited.
Cryptomatte (ObjectID) will not work with this format