vinvert(1i)
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>