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vinvert.1Vi

NAME

vinvert - invert image pixel values

SYNOPSIS

vinvert [option ...] [infile] [outfile]

DESCRIPTION

vinvert inverts each input image to produce a corresponding output image. The operation is suitable for swapping black and white in a grey-scale image.

Each output pixel is computed from the corresponding input pixel by

out-pixel = M - in-pixel

where M is the maximum value allowed by the pixel representation, or 1 in the case of float or double pixels. Input pixel values must lie in the range [0,M].

Each output image has the same number of bands, rows and columns, and the same pixel representation, as the corresponding input image.

COMMAND LINE OPTIONS

vinvert accepts the following options:

-help

Prints a message describing options.

-in infile

Specifies a Vista data file containing the input images.

-out outfile

Specifies where to write the output images as a Vista data file.

Input and output files can be specified on the command line or allowed to default to the standard input and output streams.

SEE ALSO

vnegate(1Vi), vop(1Vi), VImage(3Vi), Vista(7Vi)

AUTHOR

Art Pope <pope@cs.ubc.ca>