[Image-SIG] Re: Tiff g3

[Vladimir Pastukhov]

Hello,

ewc at axelero.hu wrote:
> Hello,
> 
> I found, that the mentioned problem is because of RESOLUTION_UNIT tag.
> It looks like it has wrong number. Around line 635 in
...
> When I reqrite ifd[key] = 0x2, it is OK (I know, this is a very ugly
> hack).

You can try a better fix from the attached file.

> I wanted to save tiff files in G3 format, is it hard to build it into
> this patch? I mean using libtiff for this work also.

The work can take from 2 to 5 days depending on your
knowledge of PIL and libtiff internals, and C.  I have
no plans for adding group3/4 encoding, at least until
our customers require it (not likely).

Best regards,
-- 
Vladimir Pastukhov <vpastukhov at naumen.ru>
NauDoc CMS/DMS Senior Developer
NAUMEN Company  http://www.naumen.com
-------------- next part --------------
--- TiffImagePlugin.py.orig	Tue Jul 29 20:00:25 2003
+++ TiffImagePlugin.py	Thu Dec 11 20:34:08 2003
@@ -345,7 +345,7 @@
                 elif tag in (X_RESOLUTION, Y_RESOLUTION):
                     # identify rational data fields
                     typ = 5
-                    continue
+                    value = reduce(lambda a,b: a+b, value)
                 else:
                     typ = 3
                     for v in value:
@@ -631,8 +631,10 @@
     if hasattr(im, 'tag'):
         # preserve tags from original TIFF image file
         for key in (RESOLUTION_UNIT, X_RESOLUTION, Y_RESOLUTION):
-            if im.tag.tagdata.has_key(key):
-                ifd[key] = im.tag.tagdata.get(key)
+            try:
+                ifd[key] = im.tag[key]
+            except KeyError:
+                pass
     if im.encoderinfo.has_key("description"):
         ifd[IMAGEDESCRIPTION] = im.encoderinfo["description"]
     if im.encoderinfo.has_key("resolution"):