Imlib 2 is the successor of the Imlib library. It is NOT a newer version -- it is a completely new library. Imlib 2 can be installed alongside Imlib 1.x without any problems since they are effectively different libraries which have very similar functionality.
If what you want isn't in the list above somewhere then likely Imlib 2 does not do it. If it does it it likely does it faster than any other library you can find (this includes gdk-pixbuf, gdkrgb, etc.) primarily because of highly optimized code and a smart subsystem that does the dirty work for you and picks up the pieces for you so you can be lazy and let all the optimizations for you.
Imlib 2 can run without a display, so it can be easily used for background image processing for web sites or servers - it only requires the X libraries to be installed - that is all - it does not require an XServer to run unless you wish to display images.
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Here are some key features of "Imlib2":
· Load image files from disk in one of many formats
· Save images to disk in one of many formats
· Render image data onto other images
· Render images to an X-Windows drawable
· Produce pixmaps and pixmap masks of Images
· Apply filters to images
· Rotate images
· Accept RGBA Data for images
· Scale images
· Alpha blend Images on other images or drawables
· Apply color correction and modification tables and factors to images
· Render images onto images with color correction and modification tables
· Render truetype anti-aliased text
· Render truetype anti-aliased text at any angle
· Render anti-aliased lines
· Render rectangles
· Render linear multi-colored gradients
· Cache data intelligently for maximum performance
· Allocate colors automatically
· Allow full control over caching and color allocation
· Provide highly optimized MMX assembly for core routines
· Provide plug-in filter interface
· Provide on-the-fly runtime plug-in image loading and saving interface
· Fastest image compositing, rendering and manipulation library for X
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