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NAME

        im_grad_x, im_grad_y - find horizontal or vertical differences

SYNOPSIS

       #include <vips/vips.h>

       int im_grad_x( IMAGE *in, IMAGE *out );

       int im_grad_y( IMAGE *in, IMAGE *out );

DESCRIPTION

       im_grad_x(3)  generates  an  image where the value of each pixel is the
       difference between horizontally ajacent pixels in the input image.  The
       output has the same height as the input and one pixel less width.

       im_grad_y(3)  generates  an  image where the value of each pixel is the
       difference between vertically ajacent pixels in the input  image.   The
       output has the same width as the input and one pixel less height.

       In  both  cases,  the  input  can  be any uncoded integer type, and the
       output is signed 32 bit integer.

RETURN VALUE

       The functions returns 0 on success and -1 on error.

COPYRIGHT

       Copyright 2008, Nottingham Trent University.

AUTHOR

       Tom Vajzovic

                                08 January 2008