Difference between revisions of "Opening large TIFFs with Photoshop"
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| − | Photoshop | + | Photoshop has a bug when opening TIFF files that exceed a certain size and are compressed using the packbit format. If you try you get the error message "Could not open ... because of a program error". When this error occurs, it is possible to open the images if they are compressed using a different algorithm. |
| − | Changing the compression can be done with any program that can open the file and save it back. A more convenient choice is to use [[ImageMagick]] together with Erik Krauses batch file [http://www.erik-krause.de/ttt/index.htm] for TIFF conversion. | + | Changing the compression can be done with any program that can open the file and save it back (caution! some image viewers - IrfanView f.e. - silently degrade 16 bit TIFFs to 8 bit). A more convenient choice is to use [[ImageMagick]] together with Erik Krauses batch file [http://www.erik-krause.de/ttt/index.htm] for TIFF conversion. |
| − | There might be problems using LZW compression due to | + | There might be problems using LZW compression due to patent issues - although the patent should have exired in all countries by now (see http://www.unisys.com/about__unisys/lzw/ for details). If this is the case, try no compression or ZIP compression. Newer versions of ImageMagick are not limited anymore. |
Revision as of 14:40, 23 March 2005
Photoshop has a bug when opening TIFF files that exceed a certain size and are compressed using the packbit format. If you try you get the error message "Could not open ... because of a program error". When this error occurs, it is possible to open the images if they are compressed using a different algorithm.
Changing the compression can be done with any program that can open the file and save it back (caution! some image viewers - IrfanView f.e. - silently degrade 16 bit TIFFs to 8 bit). A more convenient choice is to use ImageMagick together with Erik Krauses batch file [1] for TIFF conversion.
There might be problems using LZW compression due to patent issues - although the patent should have exired in all countries by now (see http://www.unisys.com/about__unisys/lzw/ for details). If this is the case, try no compression or ZIP compression. Newer versions of ImageMagick are not limited anymore.