Not sure what to do with the caller for over, "action_over" in oiiotool.cpp:
http://pastebin.com/kZ54PP0q Only lines 11 and 12 need to be changed, that is, we need to set resolution, number of channels and alpha channel, before calling ImageBufAlgo::over. I could set the resolution to be the union of the two input images. But to set number of channels and alpha channel I will need to do some checks on the input images and this "light" wrapper, won't be so light after that. Really, I have no idea what to do with this, someone has ideas? Also I realized how limited the usage of over will be by using the command line. You can't specify region of interest, you can't specify offsets, etc. What arguments can the user give to over on command line?
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