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for some JPEG files PIL does not return DPI, but returns jfif_density #40

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for some JPEG files PIL does not return DPI, but returns jfif_density #40

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11 changes: 10 additions & 1 deletion src/img2pdf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1313,9 +1313,18 @@ def get_imgmetadata(

ndpi = imgdata.info.get("dpi")
if ndpi is None:
# See: https://github.com/python-pillow/Pillow/issues/8632
if imgformat == ImageFormat.JPEG and imgdata.info.get("jfif_density") is not None:
jfif_density = imgdata.info.get("jfif_density")
jfif_unit = imgdata.info.get("jfif_unit", 0)
if jfif_unit == 1:
ndpi = jfif_density
elif jfif_unit == 2:
ndpi = (jfif_density[0] * 2.54, jfif_density[1] * 2.54)

# the PNG plugin of PIL adds the undocumented "aspect" field instead of
# the "dpi" field if the PNG pHYs chunk unit is not set to meters
if imgformat == ImageFormat.PNG and imgdata.info.get("aspect") is not None:
elif imgformat == ImageFormat.PNG and imgdata.info.get("aspect") is not None:
aspect = imgdata.info["aspect"]
# make sure not to go below the default dpi
if aspect[0] > aspect[1]:
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