forked from josch/img2pdf
src/img2pdf.py: work around PIL not reporting a colorspace for 16bit grayscale PNGs
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@ -688,7 +688,16 @@ def get_imgmetadata(imgdata, imgformat, default_dpi, colorspace, rawdata=None):
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if c.name == ics:
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color = c
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if color is None:
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color = Colorspace.other
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# PIL does not provide the information about the original
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# colorspace for 16bit grayscale PNG images. Thus, we retrieve
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# that info manually by looking at byte 10 in the IHDR chunk. We
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# know where to find that in the file because the IHDR chunk must
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# be the first chunk
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if rawdata is not None and imgformat == ImageFormat.PNG \
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and rawdata[25] == 0:
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color = Colorspace.L
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else:
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raise ValueError("unknown colorspace")
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if color == Colorspace.CMYK and imgformat == ImageFormat.JPEG:
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# Adobe inverts CMYK JPEGs for some reason, and others
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# have followed suit as well. Some software assumes the
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