ImageMagick

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ImageMagick is a collection of tools and libraries for many image formats (over 200). Supported formats include PNG, JPEG, GIF, WebP, HEIC, SVG, PDF, DPX, EXR and TIFF.[1]

Installation

USE flags

USE flags for media-gfx/imagemagick A collection of tools and libraries for many image formats

X Add support for X11
bzip2 Use the bzlib compression library
corefonts Use media-fonts/corefonts which is required by some commands
cxx Build support for C++ (bindings, extra libraries, code generation, ...)
djvu Support DjVu, a PDF-like document format esp. suited for scanned documents
fftw Use FFTW library for computing Fourier transforms
fontconfig Support for configuring and customizing font access via media-libs/fontconfig
fpx Enable media-libs/libfpx support
graphviz Add support for the Graphviz library
hdri Enable High Dynamic Range Images formats
heif Enable support for ISO/IEC 23008-12:2017 HEIF/HEIC image format using media-libs/libheif
jbig Enable jbig-kit support for tiff, Hylafax, ImageMagick, etc
jpeg Add JPEG image support
jpeg2k Support for JPEG 2000, a wavelet-based image compression format
lcms Add lcms support (color management engine)
lqr Enable experimental liquid rescale support using media-libs/liblqr
lzma Support for LZMA (de)compression algorithm
opencl Enable OpenCL support
openexr Support for the OpenEXR graphics file format
openmp Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"
pango Enable Pango support using x11-libs/pango
perl Add optional support/bindings for the Perl language
png Add support for libpng (PNG images)
postscript Enable support for the PostScript language (often with ghostscript-gpl or libspectre)
q32 Set quantum depth value to 32
q8 Set quantum depth value to 8
raw Add support for raw image formats
static-libs Build static versions of dynamic libraries as well
svg Add support for SVG (Scalable Vector Graphics)
test Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
tiff Add support for the TIFF image format
truetype Add support for FreeType and/or FreeType2 fonts
webp Add support for the WebP image format
wmf Add support for the Windows Metafile vector image format
xml Add support for XML files
zip Enable support for ZIP archives
zlib Add support for zlib (de)compression

Emerge

root #emerge --ask media-gfx/imagemagick

Configuration

Files

  • /etc/ImageMagick-7 - Global (system wide) configuration files for Imagemagick are found in this directory.

Troubleshooting

convert will not run due to security policy

The convert command does not run in the out-of-the-box configuration on certain file formats including PS, PS2, PS3, EPS, PDF, and XPS files. This is by design due to a security vulnerabilities in Ghostscript[2][3], which is a library utilized by ImageMagick to manipulate (merge, modify, etc.) PDF files. Gentoo's Security project team has maintained restrictions to ImageMagick's security policy to mitigate ongoing exploit risks in associated libraries.[4]

The solution is to comment out the lines affecting security policy for the file format(s) in question. This action is performed in the following file by using HTML/XML style comments (<!-- and -->), or simply by removing the offending line(s) altogether from the policy.xml configuration file altogether.

FILE /etc/ImageMagick-7/policy.xmlFix convert command for PDFs
<policymap>
  <policy domain="coder" rights="none" pattern="PS" />
  <policy domain="coder" rights="none" pattern="PS2" />
  <policy domain="coder" rights="none" pattern="PS3" />
  <policy domain="coder" rights="none" pattern="EPS" />
  <policy domain="coder" rights="none" pattern="PDF" />
  <policy domain="coder" rights="none" pattern="XPS" />
</policymap>

After commenting out or removing the relevant lines above, running the convert command will work as expected:

user $convert input_file_1.pdf input_file_2.pdf output_file.pdf
Important
The example above demos PDF files. Be sure to comment out lines for other types of files if not working exclusively with PDFs.

Removal

Unmerge

root #emerge --ask --depclean --verbose media-gfx/imagemagick

See also

External resources

References