vinvert(1Vi)															      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>

Vista Version 1.12						   24 April 1993						      vinvert(1Vi)