RETRO commands


PROGRAM NAME

vtilt - Add a Specified Illumination Gradient Plane to Image (K1)

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 certain 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
default: {none}
-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

vgettilt, lvgettilt, vdetilt

RESTRICTIONS

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

REFERENCES

COPYRIGHT

Copyright (C) 1993 - 1997, Khoral Research, Inc. ("KRI") All rights reserved.