Great, everything works perfectly even with this third patch. For example I had already done a test with my Subtracts function, where I put alpha=1, and it comes back the same as your new arith_subtract.ba. Reading your explanations makes it clear how many cases your plugins can be applied to. You really did a great job, thank you.
I was thinking of adding the following note to the manual, in the chapter on overlays. Do you think it is correct or should it be made more precise? "OVERLAY Remember that when making the various blends of 2 tracks you should always consider: 1- The colors of the 2 tracks that will be blended. We often consider only these channels to guess the final result. 2- The Alpha channel of the 2 tracks that can interact with each other in ways that are intuitively (but not mathematically) unexpected. 3- The choice of Source track and destination track (top or bottom). 4- The presence of a third black background track (or even the color of the canvas, which in CinGG is black by default but whose color can be varied manually), which can interfere with viewing the blend in the Compositor and show unexpected results. Ultimately, if we get a result that looks wrong to us, we need to look at the formula for that blend and calculate our mathematical result. Then compare our calculation with the result we see on the screen." -- Cin mailing list Cin@lists.cinelerra-gg.org https://lists.cinelerra-gg.org/mailman/listinfo/cin
