preprocessing: various fixes and improvements #16
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do not always fill with white; instead, determine the background color by median, and only use white for binary images; moreover, add a transparency channel if the input mode allows it
- clip/denoise/deskew/dewarp/resegment: try to split given output file grp into PAGE and image result - use fixed OCR-D-IMG-* only as fallback - parse the parameter member only when in appropriate contexts (because Processor.__init__ does not initialize this when -J or --help is requested)
- clip/deskew: put mask into the alpha channel, create one if not already existing - deskew: do not rotate the page image when deskewing on the region level (but ignore page-level orientation; region-level orientation is not additive but alternative) - common.pil2array/ocrolib.common.pil2array: handle extra layers correctly (only average over RGB channels) `alpha=1` – not used currently (since most functions already use segment masks anyway) - ocrolib.common.array2pil: allow passing alpha channels into greyscale (LA) and colour (RGBA) images
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Please don't squash, just (rebase and) merge – thanks!