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January 2004
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2004.01.19 17:21 "Re: Packbits errors", by Frank Warmerdam
Bernd Stahlbock wrote: > Dear Ladies and Gentlemen, > dear programmers, > > I have some rare reading errors with packbit compressed files. I get no > error message, but the images have some small image corruptions where > pixels are shifted to the right a little bit. Sometimes only one line, > sometimes maybe 300 or more. The next time I read the image, the display > is without errors. > > Are there any known errors like this for packbits? Doesn't have packbits > an error correction? Bernd, Packbits does not include any error correction, but if the data is corrupted in some way you should get the same results each time. If you have a file demonstrating this problem file the bug in bugzilla and Andrey can try and reproduce it. He could also run it through valgrind which may ferret out subtle memory initialization bugs. I would note the packbits decoder is really quite simple, and it is surprising there would be a bug in it after all these years. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent