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### 4.1 Introduction

This document introduces the functions available in the VIPS image processing library. For detailed information on particular functions, refer to the UNIX on-line manual pages. Enter (for example):

example% man im_abs

for information on the function im_abs().

All the comand-line vips operations will print help text too. For example:

example% vips im_extract
usage: vips im_extract input output
left top width height band
where:
input is of type "image"
output is of type "image"
left is of type "integer"
top is of type "integer"
width is of type "integer"
height is of type "integer"
band is of type "integer"
extract area/band, from package
"conversion"
flags: (PIO function)
(coordinate transformer)
(area operation)
(result can be cached)
vips: error calling function
im_run_command: too few arguments

Once you have found a function you need to use, you can call it from a C program (see §2.1), you can call it from C++ or Python (see §1.1), you can call it from the nip2 ((see the nip Manual), or SIAM graphical user-interfaces, or you can run it from the UNIX command line with the vips program. For example:

john% vips im_vips2tiff cam.v t1.tif none john% vips im_tiff2vips t1.tif t2.v.v 0 john% vips im_equal cam.v t2.v t3.v john% vips im_min t3.v 255

VIPS may have been set up at your site with a set of links which call the vips program for you. You may also be able to type:

john% im_vips2tiff cam.v t1.tif none john% im_tiff2vips t1.tif t2.v.v 0 john% im_equal cam.v t2.v t3.v john% im_min t3.v

There are a few VIPS programs which you cannot run with vips, either because their arguments are a very strange, or because they are complete mini-applications (like vips2dj). These programs are listed in table 4.1, see the man pages for full details.

Name | Description

binfile | Read RAW image
debugim | Print an image pixel by pixel
edvips | Change fields in a VIPS header
header | Print fields from a VIPS header
printlines | Print an image a line at a time
vips | VIPS universal main program
vips-7.14 | VIPS wrapper script
find_mosaic | Analyse a set of images for overlaps
mergeup | Join a set of images together
cooc_features | Calculate features of a co-occurence matrix
cooc | Calculate a co-occurence matrix
glds_features | Calculate features of a grey-level distribution matrix
glds | Calculate a grey-level distribution matrix
simcontr | Demonstrate simultaneous contrast
sines | Generate a sinusoidal test pattern
spatres | Generate a spatial resolution test pattern
squares | Generate some squares
batch_crop | Crop a lot of images
batch_image_convert | File format convert a lot of images
batch_rubber_sheet | Warp a lot of images
light_correct | Correct a set of images for shading errors
mitsub | Format a VIPS image for output to a Mitsubishi 3600
shrink_width | Shrink to a specific width
vdump | VIPS to mono Postscript
vips2dj | VIPS to high-quality colour Postscript

Table 4.1: | Miscellaneous programs

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