google app engine - Need a pure python library for reading a group3 TIFF (fax image) -

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i trying decode group3 tiff. tiff data 1bit group3 compressed. it's generated fax machine aka ccit t.4 - http://www.fileformat.info/mirror/egff/ch09_05.htm

i can not pre-convert image different format. have tried pil error group3 not supported. see there patch pil allows utalize libtiff not solution me need work on google's appengine allows pure python libraries or small whitelist of pre-approved c libraries. since pil not have patch applied default not available me in appengine.

i used use google's images service read tiff of few weeks ago stopped working , instead corrupts image after reading it.

this looks promising lacks group3 decoder support:

http://www.lfd.uci.edu/~gohlke/code/tifffile.py.html

i have tried pylibtiff, , though claims support pure python mode, can't seem run pure python module without using libtiff c libs.

if has pure python implementation of decoder grateful! need convert tiff data png can work with, in fact conversion png isn't necessary. long can convert simple bmp can later convert png. problem can't read tiff.

any suggestions please?


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