Identical PNGs compare says all colors are different

[craftkiller]

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$ compare -metric rmse "/home/talexander/.vdiff_out/2014_08_08_00_55_40/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png" "/home/talexander/.vdiff_out/2014_08_08_00_48_59/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png" ~/out.png
20644.7 (0.315019)%                                                             [talexander@tafront:~]$ md5sum "/home/talexander/.vdiff_out/2014_08_08_00_55_40/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png" "/home/talexander/.vdiff_out/2014_08_08_00_48_59/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png"
aa26bc68251f37735759cc7cac184cde  /home/talexander/.vdiff_out/2014_08_08_00_55_40/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png
aa26bc68251f37735759cc7cac184cde  /home/talexander/.vdiff_out/2014_08_08_00_48_59/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png

I've uploaded the images I was using to http://static.paphus.com/bug_report/ima ... ems.tar.xz

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$ compare --version                         (08-07 18:15)
Version: ImageMagick 6.8.9-6 Q16 x86_64 2014-07-28 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2014 ImageMagick Studio LLC
Features: DPC HDRI Modules OpenCL OpenMP
Delegates: bzlib cairo fontconfig freetype gslib jng jp2 jpeg lcms lqr ltdl lzma pangocairo png ps rsvg tiff webp wmf x xml zlib

Interestingly enough I'm not getting the issue on a machine with this version:

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$ compare --version
Version: ImageMagick 6.6.0-4 2012-05-02 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2010 ImageMagick Studio LLC
Features: OpenMP 

[fmw42]

Your upload does not contain the two input images, only the output. We would need the two input images to do our own tests.

[craftkiller]

think I figured it out, does imagemagick do its own globbing outside the shell?

[craftkiller]

It contains all 3 images

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curl "http://static.paphus.com/bug_report/imagemagick/problems.tar.xz" | tar -tJ
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 25944  100 25944    0     0  82220      0 --:--:-- --:--:-- --:--:-- 82361
home/talexander/.vdiff_out/2014_08_08_00_55_40/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png
home/talexander/.vdiff_out/2014_08_08_00_48_59/*3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png
home/talexander/out.png

[fmw42]

I have downloaded and opened your "home" folder twice now and all I see is out.png in a folder called talexander.

Your filenames such as *3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=.png

are very strange with * and =. Perhaps that is a problem. IM may be seeing the * as a wildcard. See http://www.imagemagick.org/Usage/files/#read

You have a hidden folder in there that starts with a period (.vdiff_out). If you remove the period, then it won't be hidden to everyone, at least not on Unix.

On my IM 6.8.9.6 Q16 Mac OSX, I get a perfect comparison (I renamed the two files with 1 and 2)

Code: Select all

compare -metric rmse *3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=1.png *3ZLiByTFqbVIKd5tkq7jDHs0gGLidSqAsDIO3fzvkY=2.png null:

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