Legacy ImageMagick Discussions Archive

Hello,

I've tried to search the forums for a similar problem but everything I've found so far are examples of commands to create the image I am looking for not similar issues to mine.

I'm running "Version: ImageMagick 6.5.4-7 2012-05-07 Q16 OpenMP" on CentOS 6.4 installed using YUM from the main repository. Most command line functions work really well but I don't seem to be able to create any images with an alpha channel. When trying to create a gradient with full transparency through to opaque black using the following command:

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convert -size 30x500 gradient:"black-none" -rotate 90 gradient_transparent.png

I get a solid black image with a 1 pixel white line along the bottom.

I installed ImageMagick with the following command:

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yum install ImageMagick-devel ImageMagick ImageMagick-perl

identify -list configure looks like this:

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Name          Value
-------------------------------------------------------------------------------
CC            gcc -std=gnu99
CFLAGS        -fopenmp -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wall -W -pthread
CONFIGURE     ./configure  '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix                            =/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--locals                            tatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--enable-shared' '--disable-static' '--with-modules' '--with-perl' '--with-x' '--w                            ith-threads' '--with-magick_plus_plus' '--with-gslib' '--with-wmf' '--with-lcms' '--with-rsvg' '--with-xml' '--with-perl-options=INSTALLDIRS=vendor  CC='\''gcc -L/builddir/build/B                            UILD/ImageMagick-6.5.4-7/magick/.libs'\'' LDDLFLAGS='\''-shared -L/builddir/build/BUILD/ImageMagick-6.5.4-7/magick/.libs'\''' '--without-dps' '--without-included-ltdl' '--with-ltd                            l-include=/usr/include' '--with-ltdl-lib=/usr/lib64' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'target_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-O2                             -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' 'CXXFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexcepti                            ons -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'
COPYRIGHT     Copyright (C) 1999-2009 ImageMagick Studio LLC
CPPFLAGS      -I/usr/include/ImageMagick
CXX           g++
CXXFLAGS      -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wall -W -pthread
DEFS          -DHAVE_CONFIG_H
DELEGATES     bzlib fontconfig freetype gs jpeg jng jp2 lcms png rsvg tiff x11 xml wmf zlib
DISTCHECK_CONFIG_FLAGS 'CFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --disable-deprecated --with                            -quantum-depth=16 --with-umem=no --with-autotrace=no --with-dps=no --with-fontpath=
EXEC-PREFIX   /usr
HOST          x86_64-redhat-linux-gnu
LDFLAGS       -L/usr/lib64 -lfreetype
LIB_VERSION   0x654
LIB_VERSION_NUMBER 6,5,4,7
LIBS          -lMagickCore -llcms -ltiff -lfreetype -ljpeg -lfontconfig -lXext -lSM -lICE -lX11 -lXt -lbz2 -lz -lm -lgomp -lpthread -lltdl
NAME          ImageMagick
PCFLAGS       -fopenmp
PREFIX        /usr
QuantumDepth  16
RELEASE_DATE  2012-05-07
VERSION       6.5.4
WEBSITE       http://www.imagemagick.org

Any idea what's going on? Am I missing a dependency?

I realise I'm not running the latest version of ImageMagick but surely there should be alpha support in the version I'm using?

Thanks

That's a very old version -- 4 years old. The oldest I have is v6.5.8, on Windows 7. Your command work fine on that version. You don't need quotes around the colours, but it works with or without.

I suggest you upgrade. Workarounds may be possible for your old version, but life would be a pain.

Hello snibgo,

Thank you for your reply. I was reading where it says in the version output "2012-05-07" and thought I wasn't that behind the curve but you're absolutely right - 4 years is a long time.

To get this working properly I:

removed the previously installed version of ImageMagick with yum
installed the ELEL & REMI repos
Installed ImageMagick and dependancies
Disabled extra repos

Everything ticking along nicely now.

Hope this helps someone else.

Thanks

Good stuff.

The date given is the compilation date. It might be more useful and less confusing if it announced the release date of the source code.

snibgo wrote:Good stuff.

The date given is the compilation date. It might be more useful and less confusing if it announced the release date of the source code.

I believe convert -version provides the release date.

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