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December 2003

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2003.12.29 16:04 "Jpeg Compression causing black lines in 3.6.1", by Carl J Collin
2004.01.02 15:14 "Please don't post large files (was: [Tiff] Jpeg Compression causing black lines in 3.6.1)", by Rich Pasco
2004.01.02 15:27 "Re: Please don't post large files (was: [Tiff] Jpeg Compression causing black lines in 3.6.1)", by Carl J Collin

2003.12.29 16:04 "Jpeg Compression causing black lines in 3.6.1", by Carl J Collin

In version 3.5.7 I was able to take an image file that had a RowsPerStrip
that was off of the 8K boundary and create a JPEG compressed Tiff file and
then revert it back with hardly any degradation in quality.  In version
3.6.X, I am unable to convert my file using JPEG compression because it
gives an error due to my RowsPerStrip not being a multiple of 8.  So, I
converted it using "tiffcp -r" so that it had a value that was a multiple of
8.  Now I can compress it, but when I decompress it I get a file with big
black lines every couple of inches.  As if there are black lines on each
strip.  Does anyone know why JPEG compression/decompression seems to have
become broken with the 3.6.X series?  Or am I doing something wrong....
I would greatly appreciate if somebody can give me a hand.  I am in a
catch-22.  I need the 3.6.X series to handle a Custom Tag and yet the 3.5.7
series is the only one that seems to do compression correctly.
Thanks,
Carl


I have attached all of my types of files, including the
Original
Original and I fixed the RowsPerStrip using tiffcp -r
Compressed
Decompressed