Hi. I noticed GIMP 2.8.4 is writing the proprietary ZIP/Flate compression code (0x80b2) when exporting images in TIFF format and selecting deflate compression. According to the TIFF Revision 6.0, Supplement 2 ( http://partners.adobe.com/public/developer/en/tiff/TIFFphotoshop.pdf) the value for the Compression tag should be 0008. I can confirm Gimp is writing the proprietary tag by exporting a deflated tiff and running tiffdump 1.tif | grep Compression Compression (259) SHORT (3) 1<32946> If I use imagemagick's mogrify to create the tiff mogrify -path /home/user/ -compress Zip -depth 8 -format tif fotografía7.tif I get tiffdump /home/user/fotografía7.tif | grep Compression Compression (259) SHORT (3) 1<8> The compression algorithm is the same, only the code is changed for a standard value. As TIFF is used for long term archiving, the generating the files with the standard value is important for future implementations that may not understand the proprietary tag. Should I file a bug? Do you think it is important? Here's a section of the spec: "Note: A proprietary ZIP/Flate compression code (0x80b2) has been used by some software vendors. This code should be considered obsolete. The compression used by the obsolete code is identical to that defined above. We recommend that TIFF implementations recognize and read the obsolete code, but only write the official compression code (8)." _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
