Difference between revisions of "Opening large TIFFs with Photoshop"
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| + | This page will soon be replaced by a new more general page [[Photoshop limitations]] that will also cover system or file type specific bugs and limitations and hopefully their workarounds. | ||
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| + | : <small>Carl von Einem [[User:Zarl|Zarl]] 03:50, 28 Oct 2005 (EDT)</small> | ||
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[[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. | [[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. | ||
Revision as of 09:50, 28 October 2005
This page will soon be replaced by a new more general page Photoshop limitations that will also cover system or file type specific bugs and limitations and hopefully their workarounds.
- Carl von Einem Zarl 03:50, 28 Oct 2005 (EDT)
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.