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    $\begingroup$ Full props! It warms my bones reading this sort of succinct response in 2021. 👏 $\endgroup$ Commented May 18, 2021 at 2:02
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    $\begingroup$ @troy_s Thank you! It is nice to hear from you that I got the details right—I have only just recently been learning about any of this, so I am certainly no expert. Your writing on the subject has been very helpful. $\endgroup$ Commented May 18, 2021 at 3:29
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    $\begingroup$ Thanks a lot for the answer, and even if you don't provide a real solution (and thanks a lot for your honesty), it is really helpful to understand the source of the issue. Now, if anybody knows a more or less accurate way to obtain (straight alpha) PNG, even using an external tool, I'd love to hear about it! $\endgroup$ Commented May 18, 2021 at 8:02
  • $\begingroup$ Also, now that I know that colors are linear in the compositor, i.e. in [0.0, +∞), I'm confused: what are doing nodes like RGB curves, and which point are they choosing for the right most value? Are they first clipping everything above 1 to 1, and then do the mapping? But isn't it a bit strange since you said that [0,1] does not have any "mearning" in the linear space? Also, is there a way to inspect the actual value of the linear color at a given position? $\endgroup$ Commented May 18, 2021 at 9:07
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    $\begingroup$ @troy_s I notice that the current (as of 2.92) RGB Curves node includes a “Standard” versus “Film-like” toggle, but the documentation currently does not explain what it actually does. Do you know what it means? (It is frustrating how difficult it often is to find precise information about how various parts of Blender’s pipeline actually handle color information, and I do not particularly want to dig through the source code right now.) $\endgroup$ Commented May 18, 2021 at 19:06