[Image-SIG] Tiff not reading dpi

Markus Kemmerling kemmerling at gmx.at
Tue Jan 16 06:57:32 CET 2007

The Tiff image plugin handles the RESOLUTION_UNIT field incorrectly,  
see http://mail.python.org/pipermail/image-sig/2006-July/004011.html.

Markus Kemmerling
Medical University Vienna

Am 11.01.2007 um 10:42 schrieb Dennis Shimer:

> I have a tif image that at least 3 different programs can see the
> correct dpi information in
> (Irfanview, Gimp, Alchemy) but when I read the image using pil 1.6
> print im.info  -  shows only {'compression': 'raw'}
> dpix,dpiy=im.info['dpi']  -  gives an exception
> and if I set it explicitely then using
> im.save(filename,dpi=(dpix,dpiy))
> Irfanview sees the new dpi.
> Gimp complains that "resoultion units are meaningless"
> and Alchemy sees no DPI info at all but doesn't complain.
> Is there any reason that there is so much inconsistancy in results, or
> a way to write dpi with pil that would be universally recognized?
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