VIPS operation API by section
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arithmetic — operations which perform pixel arithmetic, trig, log, statistics
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colour — colour operators
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conversion — convert images in some way: change band format, change header, insert, extract, join
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convolution — convolve and correlate images
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VipsForeign — load and save images in a variety of formats
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freqfilt — fourier transforms and frequency-domin filters
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histogram — find, manipulate and apply histograms and lookup tables
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draw — drawing operations: flood, paste, line, circle
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VipsInterpolate — various interpolators: nearest, bilinear, and
some non-linear
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morphology — morphological operators, rank filters and related image 
analysis
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mosaicing — build image mosaics
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create — create images in various ways
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resample — resample images in various ways