Hi, it has nothing to do with missing TIFF headers.
TIFFDUMP OUTPUT FOR THE SECOND FILE
===================================
BitsPerSample (258) SHORT (3) 4<16 16 16 16>
PIL can't process 16-bit/channel images. You can use -depth 8
option in your ImageMagick commandline to force 8-bit/channel output
(as the original image is also 8-bit, I assume you use the Q16 version
of ImageMagick which always converts to 16-bit for supported fileformats
on output if you don't tell it otherwise).
Regards,
Florian Höch
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