2005.01.13 13:14 "[Tiff] TIFF - Unknown field with tag 34665", by Claude Houle

2005.01.14 05:45 "Re: TIFF - Unknown field with tag 34665 ( Part 3 )", by Bob Friesenhahn

My first problem was due to CMYK Colorspace Problem and was easily fixed thanks to the clear insights of Mr. Jorris. Yet I have another problem which I cannot seem to find what it is. And perhaps you will be able to see the problem when you see the pictures. Unfortunately, the pictures are pretty big, and there is a 40K Limit to the mailing list ( Believe I tried... ).

I uploaded a ZIP File to my personnal home page ( http://www.darkwanderer.org/files/Sample2.zip ) which contain all the evidences gathered so far.

The zip file contain:

  1. - The Original Adobe TIFF Image
  2. - A Screenshot from IMDisplay in action for the TIFF File. ( You will see the picture degradation )
  3. - A Screenshot from GIMP ( What the picture should look like in IMDisplay )

Let me know if you find what the problem is. ( Hopefully, just another case of user ignorance on my part ).

I have updated GraphicsMagick to fix this bug. Now it displays the image similar to the GIMP. See "http://www.graphicsmagick.org/" for information about GraphicsMagick (similar commands to ImageMagick, comes with imdisplay, etc.).

The updates are in GraphicsMagick CVS (default branch) and will be in today's source snapshot which may be downloaded from "ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/snapshots".

Note that GraphicsMagick & GIMP do not display the exact same result as Photoshop. Photoshop shows the image background as pale green while GraphicsMagick & GIMP show it as white. It may be that some of those extra samples are used to perform additional adjustments on the image in some way or maybe it has to do with the crummy CMYK to RGB conversion (should use a ICC CMS profile).


Bob Friesenhahn