[BUG] VapourSynth Levels filter does not work for RGB24 image streams

[shijan]

Not sure how to generate PNG 32-bit. When i try to export PNG as 32 bit from image editor it give me message: "Images with unsupported bit depth"

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For images only need:
RGB24 = 8bit per component
RGB48 = 16bit per component
RGBS = single precision (probably used for 32 bit TIFF file)