NIP2(1) 						      General Commands Manual							   NIP2(1)

NAME

       nip2 - image processing with the VIPS library

SYNOPSIS

       nip2 [filename1 ...]
       nip2 -s filename [arg1 ...]
       nip2 -e expression [arg1 ...]

DESCRIPTION

       nip2 (for New Image Processing) is a tool for manipulating images using the VIPS image processing library.

       There are three principal modes:

       nip2 [filename1 ...]
	 start in GUI mode, loading the named files

       nip2 -e expression [arg1 ...]
       nip2 --expression=EXPRESSION [arg1 ...]
	 start in no-GUI mode; set main = expression, set list argv to
	 ["filename", "arg1", "arg2", ...], set argc to length of list; print
	 the value of symbol "main" to stdout; exit

       nip2 -s filename [arg1 ...]
       nip2 --script=FILENAME [arg1 ...]
	 start in no-GUI mode; read in filename as a set of definitions,
	 set list argv to ["filename", "arg1", "arg2", ...], set argc to
	 length of list; print the value of symbol "main" to stdout; exit;
	 useful for running nip2 as an interpreter on unix

       You can use -o to direct output to a file rather than stdout.

       -o filename
       --output=FILENAME
	 the value of main is written to the named file. If main is a
	 list, the filename is incremented between objects. You can use
	 the suffix to specify the format and options to write in

       Other  options provide finer control over startup and shutdown. If you need to do something strange, don't use -e/-s, use these in combina-
       tion.

       -b
       --batch
	 batch (ie. non-GUI) mode

       -m
       --no-load-menus
	 don't load menus, for faster startup

       -a
       --no-load-args
	 don't load extra command-line arguments

       -w
       --stdin-ws
	 load stdin as a workspace

       -d
       --stdin-def
	 load stdin as a set of definitions

       -p
       --print-main
	 print the value of main on exit. nip2 will check for a top-level
	 symbol called main, and also check each workspace for a main

       Finally some other options are useful for debugging, timing and for generating strings for internationalisation.

       -V
       --verbose
	 produce verbose error messages: handy for debugging in batch mode

       -i
       --i18n
	 output strings from .def files for internationalisation

       -v
       --version
	 print version information

       -c
       --benchmark
	 benchmark: no GUI, just start up and shut down

       -t
       --time-save
	 time saves: after every image save a popup tells you the time the
	 save took in seconds

       -T
       --test
	 test: start up (including any arg processing), test for any errors,
	 and exit with an error code if any occured. Useful for running
	 automated tests.

       -x PREFIX
       --prefix=PREFIX
	 set install prefix: start up as if nip2 had been installed to PREFIX.
	 Useful for running automated tests without installing the thing.

EXAMPLES

	 nip2 fred.jpg

       Start nip2, loading fred.jpg.

	 nip2 -e "2 + 2"

       Prints 4 to stdout.

	 nip2 -e "99 + Image_file argv?1" -o result.png fred.jpg

       Load argv1 (fred.jpg), add 99, output to result.png.

	 nip2 -e "Matrix [[1,2],[4,5]] ** -1" -o poop.mat

       Invert the 2x2 matrix and write the result to poop.mat.

COPYRIGHT

       2008 (c) Imperial College, London

								    Oct 4 2004								   NIP2(1)