Closed patatetom closed 6 years ago
@patatetom I cannot reproduce this. This gif image has errors and ImageMagick fails to open it with an error (and Python image library probably just ignores the errors). The error is properly caught in blockhash too. I get the following output when running blockhash with this image:
./blockhash pdf-ownership-variant1-2x.gif
Error opening image file pdf-ownership-variant1-2x.gif
What version if ImageMagick libraries have you got installed?
hi again Artem,
I now think it's a problem with ImageMagick 6.9.9-3, because when I try to open the gif with the display
tool of the suite, my computer (vm) freezes immediately.
on another computer, display
in version 7.0.7-21 hardly opens the image but does not fall. I'll check blockhash
on this system : if no feedback from me, it's because the problem was related to ImageMagick as you suggested.
thanks for the trail, lacsaP.
no errors for blockhash
with ImageMagick 7.0.7-21 :
blockhash-master $ ./waf configure
Setting top to : /tmp/blockhash-master
Setting out to : /tmp/blockhash-master/build
Checking for 'gcc' (c compiler) : /usr/bin/gcc
Checking for library m : yes
Checking for program pkg-config : /usr/bin/pkg-config
Checking for 'MagickWand' : yes
Checking for 'MagickWand' version : yes
'configure' finished successfully (0.196s)
blockhash-master $ ./waf
Waf: Entering directory `/tmp/blockhash-master/build'
[1/2] c: blockhash.c -> build/blockhash.c.1.o
[2/2] cprogram: build/blockhash.c.1.o -> build/blockhash
Waf: Leaving directory `/tmp/blockhash-master/build'
'build' finished successfully (0.263s)
blockhash-master $ ldd build/blockhash
linux-vdso.so.1 (0x00007ffd60d80000)
libMagickWand-7.Q16HDRI.so.5 => /usr/lib/libMagickWand-7.Q16HDRI.so.5 (0x00007f99aa973000)
libMagickCore-7.Q16HDRI.so.5 => /usr/lib/libMagickCore-7.Q16HDRI.so.5 (0x00007f99aa48d000)
...
blockhash-master $ ./build/blockhash /tmp/pdf-ownership-variant1-2x.gif
0000aaaaffff7fff0000ffffffffffff0000aaaaffffffff0000fefefefede00 /tmp/pdf-ownership-variant1-2x.gif
but this image still causes problems (freeze) for ImageMagick when, for example, I try to extract all frames from it with the command convert -coalesce /tmp/pdf-ownership-variant1-2x.gif /tmp/out%05d.gif
(but it's ok if I remove option).
blockhash-master $ convert --version
Version: ImageMagick 7.0.7-21 Q16 x86_64 2018-01-07 http://www.imagemagick.org
Copyright: © 1999-2018 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenCL OpenMP
Delegates (built-in): bzlib cairo fontconfig freetype gslib jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png ps raw rsvg tiff webp wmf x xml zlib
hello,
during an automatic image processing, I came across this animated GIF image that completely freezes my computer when blockhash tries to calculate its checksum.
the problem does not occur with the Python version.
regards, lacsaP.
pdf-ownership-variant1-2x.gif.gz (this image ~900ko is provided by Adobe for Acrobat Reader)