I need the pixels from images to be RGBA, regardless of how the data is stored
in the image (and whether or not the image contains an Alpha channel). But I
couldn't find a function to request the image pixels in this format (or any
specific format, for that matter). Assuming there isn't one, how can I get get
the pixels in this format? Is there an idiom to archive this?
In the documentation for ImageBufAlgo I found a way to add an alpha channel to
an RGB image. But what if the image is not in RGB format?
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