plug_in_sobel (1997)

NAME

plug_in_sobel - Edge Detection with Sobel Operation

SYNOPSIS

plug_in_sobel (run_mode,image,drawable,horizontal,vertical,keep_sign)

DESCRIPTION

This plugin calculates the gradient with a sobel operator. The user can specify which direction to use. When both directions are used, the result is the RMS of the two gradients; if only one direction is used, the result either the absolut value of the gradient, or 127 + gradient (if the 'keep sign' switch is on). This way, information about the direction of the gradient is preserved. Resulting images are not autoscaled.

MENUPATH

<Image>/Filters/Edge-Detect/Sobel...

IMAGETYPES

RGB*, GRAY*

INPUT ARGUMENTS

TYPE	NAME	DESCRIPTION
INT32	run_mode	Interactive, non-interactive
IMAGE	image	Input image (unused)
DRAWABLE	drawable	Input drawable
INT32	horizontal	Sobel in horizontal direction
INT32	vertical	Sobel in vertical direction
INT32	keep_sign	Keep sign of result (one direction only)

SOME SYNTAX ALTERNATIVES

$drawable->sobel (horizontal,vertical,keep_sign)
$image->sobel (drawable,horizontal,vertical,keep_sign)
plug_in_sobel (drawable,horizontal,vertical,keep_sign)
sobel Layer (drawable,horizontal,vertical,keep_sign)
sobel Image (drawable,horizontal,vertical,keep_sign)
sobel Plugin (drawable,horizontal,vertical,keep_sign)

INSTALLATION PATH

/opt/lib/gimp/1.2/plug-ins/sobel

AUTHOR

Thorsten Schnier
(c)1997 Thorsten Schnier