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| Toolkit | Contains | Description |
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| _convert | parse_int l, … | convert ascii text to numbers |
| to_matrix x, … | convert anything into a matrix |
| colour_transform_to to x, … | convert between colour spaces |
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| _generate | image_new w h ... | make a blank image |
| image_white i | look at image i, try to guess what white is |
| make_xy w h | make an image of size w by h whose pixel value are |
| | their coordinates |
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| _types | Image i | all the standard classes and support functions, |
| | see §6.13 |
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| _predicate | is_colour_space i | test for objects are in various categories or have |
| | various properties |
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| _stdenv | logical_and x, … | function versions of all the operators |
| bandsplit i, … | break up and recombine images by band |
| mean x, … | statistical ops on objects |
| transpose x, flipud x, rot90 x, … | flips, rotates, etc. on objects |
| rad x, pi, … | trigonometry stuff |
| sign x, conj x, polar x, … | complex stuff |
| rint x, ceil x, … | various rounding things |
| fwfft x, … | fourier stuff |
| dilate m x, rank w h n i, … | morphology stuff |
| conv m x, … | convolution stuff |
| image_set_type t i, … | set various image header field |
| resize x y i, … | resampling images |
| recomb m i, … | recombinations |
| clip2fmt f i, … | format conversions |
| hist_find m x, … | histogram stuff |
| id x, const x y, … | various useful operations on functions |
| map_binary fn x y, … | mapping over groups |
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Table 6.4: | Useful utility functions — see the source for details |
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