Support pixmap "unmultiply" #2633
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For Pillow output of RGB images with transparency, the new parameter `unmultiply=True` causes the use of Pillow mode "RGBa" (instead of "RGBA"). The Pillow image will then be created with unmultiplied pixels.
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For Pillow output of RGB images with transparency, the new parameter
unmultiply=Truecauses the use of Pillow mode "RGBa" (instead of "RGBA"). The Pillow image will then be created with unmultiplied pixels.This is the documentary aspect of support closed issue #2593.