Full Description: 

GraphicsMagick is the swiss army knife of image processing.

GraphicsMagick supports huge images and has been tested with gigapixel-size images. GraphicsMagick can create new images on the fly, making it suitable for building dynamic Web applications. GraphicsMagick may be used to resize, rotate, sharpen, color reduce, or add special effects to an image and save the result in the same or different image format. Image processing operations are available from the command line, as well as through C, C++, Lua, Perl, PHP, Python, Tcl, Ruby, Windows .NET, or Windows COM programming interfaces.

General purpose graphics converter. Can convert PDF pages to images. Resizes images, makes them transparent and includes a number of other functions.

Mostly command line, but there are some X11 GUI tools included.

Features Include: 

Convert an image from one format to another (e.g. TIFF to JPEG)
Resize, rotate, sharpen, color reduce, or add special effects to an image
Create a montage of image thumbnails
Create a transparent image suitable for use on the Web
Compare two images
Turn a group of images into a GIF animation sequence
Create a composite image by combining several separate images
Draw shapes or text on an image
Decorate an image with a border or frame
Describe the format and characteristics of an image

System Requirements: 

Operating system: Windows, Linux, BSD, Mac OSX

GraphicsMagick is quite portable, and compiles under almost every general purpose operating system that runs on 32-bit or 64-bit CPUs. GraphicsMagick is available for virtually any Unix or Unix-like system, including Linux. It also runs under Windows 2000 and later (Windows 2000, XP, Vista, 7, 8.X, 10), and MacOS-X.

Short Description: 
Image Processing System
User Interface: 
This software is command line only