Support reading CMYK JPEG2000 images #7947
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Resolves #7945
Requires python-pillow/test-images#4
Pages 187 and 201-204 of https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=5db74700b2b544695273019e6b4820bc9742973a can be used as a reference for the 'colr' box that specifies the colourspace as CMYK.