TIFF compression not working?
Posted: 2018-09-04T11:22:50-07:00
Is there a problem with tiff group4 and fax compression? I'm having trouble getting good compression with them, and perhaps coincidentally these are the two compression schemes that were affected by this patch. For example,
gives me a 7k file when I use LZW as the method, but 39k for both fax and group4 (and for pbm), and some larger files I'm using aren't showing good compression with group4 and those other parameters. When I do `identify -verbose` the fax and group4 versions yield:
whereas some files I did a few weeks ago show the expected compression value.
On a Mac, ImageMagick 7.0.8-11 Q16 x86_64 2018-09-01, --with-fftw --with-x11 --with-openjpeg.
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magick logo: -threshold 80% -alpha off -monochrome -compress METHOD -quality 100 output.tiff
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Compression: None
On a Mac, ImageMagick 7.0.8-11 Q16 x86_64 2018-09-01, --with-fftw --with-x11 --with-openjpeg.