NIP4-BATCH(1)

NAME

nip4-batch - command-line interface to the nip4 image processing spreadsheet

SYNOPSIS
nip4-batch filename [arg1..]
nip4-batch -e expression [arg1..]
nip4-batch -w [filename1..]

DESCRIPTION
nip4-batch is a command-line interface to the nip4(1) image processing spreadsheet. There are three principal modes:

nip4-batch filename [ arg1.. ]
    Load filename as a set of definitions and pass in any other arguments as argc and argv. This is the default mode and is suitable for writing scripts in nip4's programming language. In this mode it will function as a shebang interpreter.

nip4-batch -e expression [ arg1.. ]
    Set main = expression, set argc and argc to any remaining arguments, and print the value of symbol "main" to stdout.

nip4-batch -w [ filename1.. ]
    Load the named files as workspaces or images. You can use the options below to pass the workspace parameters and control what workspace results are saved or printed.

  Command Line Options

These options give more precise control over nip4-batch's behaviour.

--workspace
    Load arguments as workspaces.

--expression=expression
    Evaluate expression and print the result to stdout. Any other arguments are loaded as argc and argv.

--output=filename
    The value of main is written to filename. 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.

--print-main
    Print the value of main on exit. nip4-batch will check for a top-level symbol called main, and also check each workspace for a main.

  Debugging Options

Some other options are useful for debugging, benchmarking, and for generating strings for internationalisation.

--verbose
    Produce verbose error messages: handy for debugging in batch mode.

--i18n
    Output strings from .def files for internationalisation.

--version
    Print version information.

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

--prefix=PREFIX
    Set install prefix. Start up as if nip4-batch had been installed to PREFIX. Useful for running automated tests without installing the thing.

EXAMPLES

nip4-batch -e 2 + 2
    Prints 4 to stdout.

nip4-batch -e 99 + Image_file argv?1 -o result.png fred.jpg
    Load argv1 (fred.jpg), add 99, output to result.png.

nip4-batch -e Matrix [[1,2],[4,5]] ** -1 -o poop.mat
    Invert the 2x2 matrix and write the result to poop.mat.

SHEBANG
You can use nip4-batch as a shebang interpreter. For example, this file
  #!/usr/bin/env nip4-batch
  main
    = error "usage: infile -o outfile", argc != 2
    = (sharpen @ shrink @ crop) (Image_file argv?1)
  {
    crop x = extract_area 100 100 (x.width - 200) (x.height - 200) x;
    shrink = resize Kernel_linear 0.9 0.9;
    sharpen = conv (Matrix_con 8 0 [[-1, -1, -1], [-1, 16, -1], [-1, -1, -1]]);
  }
When saved to a file called "process" can be executed from your shell like this:
  $ ./process a.jpg -o b.jpg
Meaning load from a.jpg, process, and save to b.jpg.

COPYRIGHT
2025 (c) libvips.org