
vtilt(1)                     Khoros                      vtilt(1)

PROGRAM
     vtilt - Adds a specified plane to the input image to correct
     for a tilt in the image luminance.

SYNTAX
     vtilt

     -i             input image

     -o             resulting output image

     [-m]           tilt operation masking image

     [-x]           specifies the slope in the X direction

     [-y]           specifies the slope in the Y direction

     [-V]           Gives the version for vtilt

     [-U]           Gives the usage for vtilt

     [-P]           Prompts for command line options

     [-A [file1]]   Creates the answer file called vtilt.ans or
                    file1

     [-a [file1]]   Uses vtilt.ans or file1 as the answer file

DESCRIPTION
     vtilt adds tilt to an image. Often an image will have a skew
     in the grey level values that represents a plane with a cer-
     tain slope.  The tilt takes the form of a plane which has an
     x and y zero crossing at the center of the image with x an y
     slope as specified in the argument list.  The x and y slopes
     must be given in units per pixel and the x and y values
     default to 0.0.

     The optional mask image (-m) must be of the same data type
     as the input images, and is used to gate the operation.  A
     non-zero mask pixel enables the output pixel to contain the
     adjusted value. A zero mask pixel just transfers the value
     of the corresponding pixel in the first input image to the
     output pixel.

REQUIRED ARGUMENTS
     -i     type: infile
            desc: input image

     -o     type: outfile
            desc: resulting output image

OPTIONAL ARGUMENTS
     -m     type: infile
            desc: tilt operation masking image

     -x     type: float
            desc: specifies the slope in the X direction
            default: 0
            bounds: no range checking

     -y     type: float
            desc: specifies the slope in the Y direction
            default: 0
            bounds: no range checking

EXAMPLES
     vtilt -i image -o out -x 2 -y -1

SEE ALSO
     intro(1), verror(3), vgparms(3), vutils(3), lvtilt(3) vget-
     tilt(1), lvgettilt(3), vdetilt(1)

RESTRICTIONS
     vtilt will not operate on COMPLEX or BIT data storage types.

COPYRIGHT
     Copyright 1991, University of New Mexico.  All rights
     reserved.

Khoros                    Release: 1.0                          1

