README updates

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# libvips : an image processing library
libvips is an image processing library. It's good for large images and for
colour. There's a GUI as well, see the [VIPS website](http://www.vips.ecs.soton.ac.uk).
libvips is a 2D image processing library. Compared to similar libraries,
[libvips runs quickly and uses little
memory](http://www.vips.ecs.soton.ac.uk/index.php?title=Speed_and_Memory_Use).
It has around 300 operations, covering arithmetic, histograms, convolutions,
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. It supports a good range of image formats, including
JPEG, TIFF, PNG, FITS, Matlab, OpenEXR, and OpenSlide. It can also load
images via ImageMagick or GraphicsMagick.
It has APIs for C and C++ and comes with a Python
binding and a command-line interface. Bindings are
available for Ruby, JavaScript and others. There is full [API
documentation](http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/index.html),
plus a [tutorial-style
manual](http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/vipsmanual/vipsmanual.html).
There's a GUI as well, see the [VIPS website](http://www.vips.ecs.soton.ac.uk).
There are packages for most unix-like operating systems and binaries for
Windows and OS X.