There are many alternatives to ImageMagick for Linux if you are looking to replace it. The most popular Linux alternative is 
XnConvert, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to ImageMagick and 11 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to ImageMagick are 
GraphicsMagick (Free, Open Source), 
pngquant (Free, Open Source), 
Phatch (Free, Open Source) and 
G'MIC (Free, Open Source).
ImageMagick is a software suite to create, edit, and compose bitmap images. If you're looking for more info about ImageMagick like screenshots, reviews and comments you should visit our info page about it. Below you find the best alternatives.
XnConvert is an easy image converter for graphic files, photos and images available on Windows, MacOSX and Linux. It supports more than 400 file formats (jpeg, tiff, png, gif, camera raw, jpeg2000, WebP, OpenEXR, ...). You can resize, add a watermark, change contrast, brightness or gamma, apply filters and many other things.
GraphicsMagick is the swiss army knife of image processing. Comprised of 282K physical lines (according to David A. Wheelers SLOCCount) of source code in the base package (or 952K including 3rd party libraries) it provides a robust and efficient collection of tools and libraries which support reading, writing, and manipulating an image in over 88 major formats including important formats like DPX, GIF, JPEG, JPEG-2000, PNG, PDF, PNM, and TIFF.
pngquant is a command-line utility and a library for lossy compression of PNG images. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all modern web browsers, and have better fallback in IE6 than 24-bit PNGs. Features * High-quality palette generation using a combination of vector quantization algorithms.
Phatch is an user friendly, cross-platform Photo Batch Processor and Exif Renamer with a nice graphical user interface. Phatch handles all popular image formats and can duplicate (sub)folder hierarchies. Phatch can batch resize, rotate, apply shadows, perspective, rounded corners, … and do much more actions in minutes instead of hours or days if you do it manually.
G'MIC is a full-featured open-source framework for image processing, distributed under the CeCILL free software licenses (LGPL-like and/or GPL-compatible). It provides several different user interfaces to convert / manipulate / filter / visualize generic image datasets, ranging from 1d scalar signals to 3d+t sequences of multi-spectral volumetric images, hence including 2d color images.
Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. Making a GIF animation with gifsicle is easy. Some more gifsicle features: Batch mode for changing GIFs in place. Prints detailed information about GIFs, including comments. Control over interlacing, comments, looping, transparency...
Converseen is a free cross-platform batch image processor for Windows and Linux that allows you to convert, resize, rotate and flip an infinite number of images with a mouse click. Moreover, Converseen is able to transform an entire PDF file into a bunch of images with the characteristics you prefer: you can choose one of the 100+ formats, you can set the size, resolution and the filename.
automatic image compression — pingo could try to detect image specifications and adjust lossy type or quality itself. it supports many transformations like lossy filtering, color quantization or paletted PNG, JPG, WebP or APNG — it should optimize or convert those format recursively for web.
SharpShot is a multi-platform picture editing software. It is meant for people who think Adobe Photoshop or GIMP are too cumbersome for everyday picture editing, while other simpler software like F-Spot or Microsoft Office Picture Manager are not powerful enough. SharpShot is meant to be a practical app that lets you edit many shots quickly, while giving you powerful and fast operations to match demanding photographers’ needs.
libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. libvips is licensed under the LGPL 2.1+. It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. It supports a large range of numeric formats, from 8-bit int to 128-bit complex. Images can have any number of bands.
