libvips/libsrc/colour/im_dE00_fromLab.c

111 lines
2.4 KiB
C

/* @(#) Calculate dE00 from two Lab images
* @(#)
* @(#) Usage:
* @(#) im_dE00_fromLab( im1, im2, im_out )
* @(#) IMAGE *im1, *im2, *im_out;
* @(#)
* @(#) float out.
* @(#)
* @(#) Returns: -1 on error, else 0
* 10/10/02 JC
* - from dECMC
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Process a buffer.
*/
void
imb_dE00_fromLab( float **p, float *q, int n )
{
float *p1 = p[0];
float *p2 = p[1];
int x;
for( x = 0; x < n; x++ ) {
float L1 = p1[0];
float a1 = p1[1];
float b1 = p1[2];
float L2 = p2[0];
float a2 = p2[1];
float b2 = p2[2];
p1 += 3;
p2 += 3;
q[x] = im_col_dE00( L1, a1, b1, L2, a2, b2 );
}
}
int
im_dE00_fromLab( IMAGE *im1, IMAGE *im2, IMAGE *out )
{
IMAGE *invec[3];
/* Check input types.
*/
if( im1->Bands != 3 || im1->BandFmt != IM_BANDFMT_FLOAT ||
im1->Coding != IM_CODING_NONE ||
im2->Bands != 3 || im2->BandFmt != IM_BANDFMT_FLOAT ||
im2->Coding != IM_CODING_NONE ) {
im_errormsg( "im_dE00_fromLab: 3-band float only" );
return( -1 );
}
/* Prepare the output image
*/
if( im_cp_descv( out, im1, im2, NULL ) )
return( -1 );
out->Bbits = IM_BBITS_FLOAT;
out->Bands = 1;
out->BandFmt = IM_BANDFMT_FLOAT;
out->Type = IM_TYPE_B_W;
/* Do the processing.
*/
invec[0] = im1; invec[1] = im2; invec[2] = NULL;
if( im_wrapmany( invec, out,
(im_wrapmany_fn) imb_dE00_fromLab, NULL, NULL ) )
return( -1 );
return( 0 );
}