/* Call im_fgrey via arg vector.
*/
static int
fgrey_vec( im_object *argv )
{
int xsize = *((int *) argv[1]);
int ysize = *((int *) argv[2]);
return( im_fgrey( argv[0], xsize, ysize ) );
}
/**
* im_grey:
* @out: output image
* @xsize: image size
* @ysize: image size
*
* Create a one-band uchar image with the left-most column zero and the
* right-most 255. Intermediate pixels are a linear ramp.
*
* See also: im_fgrey(), im_make_xy(), im_identity().
*
* Returns: 0 on success, -1 on error
*/
int
im_grey( IMAGE *out, const int xsize, const int ysize )
{
IMAGE *t[2];
/* Change range to [0,255].
*/
if( im_open_local_array( out, t, 2, "im_grey", "p" ) ||
im_fgrey( t[0], xsize, ysize ) ||
im_lintra( 255.0, t[0], 0.0, t[1] ) ||
im_clip2fmt( t[1], out, IM_BANDFMT_UCHAR ) )
return( -1 );
return( 0 );
}
