Operating systems

QIS has been installed and is known to work on the following operating systems.

The most common problem encountered is the version of ImageMagick that ships with the operating system. Unfortunately, ImageMagick is released continuously and occasionally includes runs of unstable code changes.

• Ubuntu 14.04 LTS - ImageMagick 6.7.7-10 - OK
• Ubuntu 16.04 LTS - ImageMagick 6.8.9-9 - OK
• Ubuntu 18.04 LTS - ImageMagick 6.9.7-4 - OK
• Red Hat Enterprise Linux 6.5 - ImageMagick 6.5.4-7 - OK
• Red Hat Enterprise Linux 6.7 to 6.8 - ImageMagick 6.7.2-7 - OK
• Red Hat Enterprise Linux 7.x - ImageMagick 6.7.8-9 - buggy colour management - see below

Red Hat Enterprise Linux 7.x

ImageMagick 6.7.8-9 handles colorspace conversions and colour profiles incorrectly. To fix this you need to install a more recent version of ImageMagick.

Remove the standard version, if it is already installed:

$ sudo yum remove ImageMagick

Download a more recent stable version from https://www.imagemagick.org/download/linux/CentOS/x86_64/ :

$ wget https://www.imagemagick.org/download/linux/CentOS/x86_64/ImageMagick-6.9.8-0.x86_64.rpm
$ wget https://www.imagemagick.org/download/linux/CentOS/x86_64/ImageMagick-libs-6.9.8-0.x86_64.rpm
(optional for development)
$ wget https://www.imagemagick.org/download/linux/CentOS/x86_64/ImageMagick-devel-6.9.8-0.x86_64.rpm

Install the newer version:

$ sudo yum install ImageMagick-libs-6.9.8-0.x86_64.rpm
$ sudo yum install ImageMagick-6.9.8-0.x86_64.rpm

This fixes the colour management, but if you want to work with SVG files there is a new problem. The standard rpm supplied by ImageMagick has a built-in SVG renderer that does not work well. To fix this you will need to install the librsvg2-devel package and compile ImageMagick from source, specifying --with-rsvg at the configure stage. See http://legacy.imagemagick.org/script/install-source.php