| /* Turn XYZ to Yxy colourspace. |
| * |
| * Modified: |
| * 29/5/02 JC |
| * - from lab2xyz |
| * 2/11/09 |
| * - gtkdoc |
| * - cleanups |
| */ |
| |
| /* |
| |
| 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> |
| #include <vips/internal.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /* Process a buffer of data. |
| */ |
| void |
| imb_XYZ2Yxy( float *p, float *q, int n ) |
| { |
| int i; |
| |
| for( i = 0; i < n; i++ ) { |
| float X = p[0]; |
| float Y = p[1]; |
| float Z = p[2]; |
| double total = X + Y + Z; |
| |
| float x, y; |
| |
| p += 3; |
| |
| x = X / total; |
| y = Y / total; |
| |
| q[0] = Y; |
| q[1] = x; |
| q[2] = y; |
| q += 3; |
| } |
| } |
| |
| /** |
| * im_XYZ2Yxy: |
| * @in: input image |
| * @out: output image |
| * |
| * Turn XYZ to Yxy. |
| * |
| * Returns: 0 on success, -1 on error. |
| */ |
| int |
| im_XYZ2Yxy( IMAGE *in, IMAGE *out ) |
| { |
| return( im__colour_unary( "im_XYZ2Yxy", in, out, IM_TYPE_YXY, |
| (im_wrapone_fn) imb_XYZ2Yxy, NULL, NULL ) ); |
| } |
| |