![]() ![]() Pct = 25 # temparily set pct to 25 percent for demonstration Replace the alpha in the BGRA image with the stacked alpha Create a vertical gradient going from 255 to 0 for the bottom Compute top and bottom heights for the alpha channel These work like the filters or settings you'd see in photo editing software.Here is one way to do that in Python/OpenCV/Numpy for opaque images. You can also apply adjustments to Images. You can use the slider to choose your Frame, or press the play and stop icons to select a Frame.
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