The command was:
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mogrify -format jpg -quality 100 -geometry x140 tuomas.gif
The same occurs in gif->png:
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convert -format png -quality 100 -geometry x140 tuomas.gif tuomas.png
Result jpg:
Server is Centos6 64 and ImageMagick is ImageMagick-6.8.4, installed from source http://www.imagemagick.org/download/ImageMagick.tar.gz.
The problem didn't exists in Centos 6 default (ImageMagick-6.5.4.7-6.el6_2.x86_64).
Am I doing something wrong or is this a bug in 6.8.4?
Below is my configure:
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# convert -list configure
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Path: /usr/lib/ImageMagick-6.8.4//config-Q16/configure.xmlName Value-------------------------------------------------------------------------------CC gcc -std=gnu99 -std=gnu99CFLAGS -I/usr/include/freetype2 -fopenmp -g -O2 -Wall -pthread -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16CODER_PATH /usr/lib/ImageMagick-6.8.4/modules-Q16/coders
CONFIGURE ./configure '--prefix=/usr' '--enable-shared' '--disable-static' '--with-modules' '--with-perl' '--without-magick_plus_plus' '--with-wmf' '--with-lcms' '--with-rsvg'
CONFIGURE_PATH /usr/etc/ImageMagick-6/
COPYRIGHT Copyright (C) 1999-2013 ImageMagick Studio LLC
CPPFLAGS -I/usr/include/ImageMagick-6
CXX g++
CXXFLAGS -g -O2 -pthread
DEFS -DHAVE_CONFIG_H
DELEGATES bzlib djvu fontconfig freetype jbig jng jp2 jpeg lcms lzma openexr pango png ps rsvg tiff wmf x xml zlib
DISTCHECK_CONFIG_FLAGS --disable-deprecated --with-quantum-depth=16 --with-umem=no --with-autotrace=no --with-gslib=no --with-fontpath= --with-gvc=no --with-webp=no
DOCUMENTATION_PATH /usr/share/doc/ImageMagick-6
EXEC-PREFIX /usr
EXECUTABLE_PATH /usr/bin
FEATURES DPC OpenMP Modules
FILTER_PATH /usr/lib/ImageMagick-6.8.4/modules-Q16/filters
HOST x86_64-unknown-linux-gnu
INCLUDE_PATH /usr/include/ImageMagick-6
LDFLAGS -L/usr/lib
LIB_VERSION 0x684
LIB_VERSION_NUMBER 6,8,4,2
LIBRARY_PATH /usr/lib/ImageMagick-6.8.4
LIBS -lMagickCore -llcms2 -lfreetype -lfontconfig -lXext -lSM -lICE -lX11 -lXt -llzma -lbz2 -lz -lltdl -lm -lgomp -lpthread
NAME ImageMagick
PCFLAGS -fopenmp -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16
PREFIX /usr
QuantumDepth 16
RELEASE_DATE 2013-03-29
SHARE_PATH /usr/share/ImageMagick-6
SHAREARCH_PATH /usr/lib/ImageMagick-6.8.4/config-Q16
SVN_REVISION 11558
TARGET_CPU x86_64
TARGET_OS linux-gnu
TARGET_VENDOR unknown
VERSION 6.8.4
WEBSITE http://www.imagemagick.org
Path: [built-in]
Name Value
-------------------------------------------------------------------------------
FEATURES OpenMP
NAME ImageMagick
QuantumDepth 16