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The picture colors was changed obviously after convert
Posted: 2015-09-16T23:39:12-07:00
by needkane
origin:
http://img.dajia365.com/8d7f61050f7075e ... 99da9f.jpg
command : convert 8d7f61050f7075ec55eaff82a999da9f.jpg -thumbnail 370x370 -quality 100 result.jpg
we found result.jpg colors was changed obviously.
And we test others parameter value,there's not no change.
convert 8d7f61050f7075ec55eaff82a999da9f.jpg -thumbnail 370x370 -quality 90 result.jpg //ok
convert 8d7f61050f7075ec55eaff82a999da9f.jpg -thumbnail 371x371 -quality 100 result.jpg //ok
Re: The picture colors was changed obviously after convert
Posted: 2015-09-16T23:54:14-07:00
by dlemstra
Can you specify your operating system and the output from convert - version
Re: The picture colors was changed obviously after convert
Posted: 2015-09-20T18:55:27-07:00
by needkane
OS is Ubuntu 12.04 , imagick 6.9.1
Re: The picture colors was changed obviously after convert
Posted: 2015-09-22T02:26:46-07:00
by needkane
dlemstra wrote:Can you specify your operating system and the output from convert - version
convert -version
Version: ImageMagick 6.9.1-2 Q16 x86_64 2015-05-18
http://www.imagemagick.org
Copyright: Copyright (C) 1999-2015 ImageMagick Studio LLC
License:
http://www.imagemagick.org/script/license.php
Features: DPC OpenMP
Delegates (built-in): bzlib djvu fftw fontconfig freetype jng jpeg lcms lqr lzma openexr pangocairo png tiff webp x xml zlib
Re: The picture colors was changed obviously after convert
Posted: 2015-09-22T03:57:48-07:00
by dlemstra
The link of your original file seems to be missing?
Re: The picture colors was changed obviously after convert
Posted: 2015-09-22T23:47:39-07:00
by needkane
dlemstra wrote:The link of your original file seems to be missing?
origin:
http://s3-us-west-2.amazonaws.com/qiniu-bs/370blue
Re: The picture colors was changed obviously after convert
Posted: 2015-09-24T09:46:38-07:00
by fmw42
It would be helpful to see your JPG result that you say has changed colors. JPG is a lossy compression and will always change pixel values. If you say the actual overall color has changed. That is different. It could be a bug in IM or that you are using an older version of libjpeg.
I have tested your command on this image in IM 6.9.2.3 Q16 Mac OSX with jpeg 9a_1 (from MacPorts) and it works fine for me. I see no color changes.
Re: The picture colors was changed obviously after convert
Posted: 2015-10-09T22:41:08-07:00
by needkane
fmw42 wrote:It would be helpful to see your JPG result that you say has changed colors. JPG is a lossy compression and will always change pixel values. If you say the actual overall color has changed. That is different. It could be a bug in IM or that you are using an older version of libjpeg.
I have tested your command on this image in IM 6.9.2.3 Q16 Mac OSX with jpeg 9a_1 (from MacPorts) and it works fine for me. I see no color changes.
I use libjpeg.so.8
Re: The picture colors was changed obviously after convert
Posted: 2015-10-09T22:57:42-07:00
by fmw42
Perhaps you should upgrade both IM and libjpeg. Also again, it would be interesting to see your resulting image that you say is changed?
Re: The picture colors was changed obviously after convert
Posted: 2015-10-21T20:56:58-07:00
by needkane
fmw42 wrote:Perhaps you should upgrade both IM and libjpeg. Also again, it would be interesting to see your resulting image that you say is changed?
It's also failed with use imagick 6.9.2-3
ldd /usr/local/bin/convert |grep jpeg
libjpeg.so.8 => /usr/lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007fd0d99d9000)
convert -version
Version: ImageMagick 6.9.2-3 Q16 x86_64 2015-10-22
http://www.imagemagick.org
Copyright: Copyright (C) 1999-2015 ImageMagick Studio LLC
License:
http://www.imagemagick.org/script/license.php
Features: Cipher DPC OpenMP
Delegates (built-in): bzlib djvu fftw fontconfig freetype gvc jbig jng jpeg lcms lqr lzma openexr pangocairo png tiff webp wmf x xml zlib
cmd :convert 370blue -thumbnail 370x370 -quality 100 result.jpg
origin:
http://s3-us-west-2.amazonaws.com/qiniu-bs/370blue
result:
http://7xlywb.com1.z1.glb.clouddn.com/result.jpg
Re: The picture colors was changed obviously after convert
Posted: 2015-10-21T23:01:27-07:00
by fmw42
convert 370blue -thumbnail 370x370 -quality 100 result.jpg
your input image 370blue is missing a suffix.
This works fine for me on IM 6.9.2.4 Q16 Mac OSX
Code: Select all
convert 370blue.jpeg -thumbnail 370x370 -quality 100 result.jpg
Re: The picture colors was changed obviously after convert
Posted: 2015-10-22T00:19:39-07:00
by needkane
fmw42 wrote:convert 370blue -thumbnail 370x370 -quality 100 result.jpg
your input image 370blue is missing a suffix.
This works fine for me on IM 6.9.2.4 Q16 Mac OSX
Code: Select all
convert 370blue.jpeg -thumbnail 370x370 -quality 100 result.jpg
At 2015-09-24 you say:
fmw42 wrote:
It would be helpful to see your JPG result that you say has changed colors. JPG is a lossy compression and will always change pixel values. If you say the actual overall color has changed. That is different. It could be a bug in IM or that you are using an older version of libjpeg.
I have tested your command on this image in IM 6.9.2.3 Q16 Mac OSX with jpeg 9a_1 (from MacPorts) and it works fine for me. I see no color changes
Now ,i use imagick 6.9.2-3 is failed
