388 lines
12 KiB
C
388 lines
12 KiB
C
/* convert between colourspaces
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*
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* 6/11/12
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* - add RGB16 as a destination
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include "colour.h"
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static int
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vips_scRGB2RGB16( VipsImage *in, VipsImage **out, ... )
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{
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return( vips_scRGB2sRGB( in, out, "depth", 16, NULL ) );
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}
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/* A colour-transforming function.
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*/
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typedef int (*VipsColourTransformFn)( VipsImage *in, VipsImage **out, ... );
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/* Maximum number of steps we allow in a route. 10 steps should be enough
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* for anyone.
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*/
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#define MAX_STEPS (10)
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/* A route between two colour spaces.
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*
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* 10 steps should be enough for anyone.
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*/
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typedef struct _VipsColourRoute {
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VipsInterpretation from;
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VipsInterpretation to;
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VipsColourTransformFn route[MAX_STEPS + 1];
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} VipsColourRoute;
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/* Some defines to save typing. These are the colour spaces we support
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* conversions between.
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*/
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#define XYZ VIPS_INTERPRETATION_XYZ
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#define LAB VIPS_INTERPRETATION_LAB
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#define LABQ VIPS_INTERPRETATION_LABQ
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#define LCH VIPS_INTERPRETATION_LCH
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#define CMC VIPS_INTERPRETATION_CMC
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#define LABS VIPS_INTERPRETATION_LABS
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#define scRGB VIPS_INTERPRETATION_scRGB
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#define sRGB VIPS_INTERPRETATION_sRGB
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#define RGB16 VIPS_INTERPRETATION_RGB16
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#define YXY VIPS_INTERPRETATION_YXY
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/* All the routes we know about.
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*/
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static VipsColourRoute vips_colour_routes[] = {
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{ XYZ, LAB, { vips_XYZ2Lab, NULL } },
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{ XYZ, LABQ, { vips_XYZ2Lab, vips_Lab2LabQ, NULL } },
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{ XYZ, LCH, { vips_XYZ2Lab, vips_Lab2LCh, NULL } },
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{ XYZ, CMC, { vips_XYZ2Lab, vips_Lab2LCh, vips_LCh2CMC, NULL } },
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{ XYZ, LABS, { vips_XYZ2Lab, vips_Lab2LabS, NULL } },
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{ XYZ, scRGB, { vips_XYZ2scRGB, NULL } },
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{ XYZ, sRGB, { vips_XYZ2scRGB, vips_scRGB2sRGB, NULL } },
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{ XYZ, RGB16, { vips_XYZ2scRGB, vips_scRGB2RGB16, NULL } },
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{ XYZ, YXY, { vips_XYZ2Yxy, NULL } },
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{ LAB, XYZ, { vips_Lab2XYZ, NULL } },
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{ LAB, LABQ, { vips_Lab2LabQ, NULL } },
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{ LAB, LCH, { vips_Lab2LCh, NULL } },
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{ LAB, CMC, { vips_Lab2LCh, vips_LCh2CMC, NULL } },
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{ LAB, LABS, { vips_Lab2LabS, NULL } },
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{ LAB, scRGB, { vips_Lab2XYZ, vips_XYZ2scRGB, NULL } },
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{ LAB, sRGB, { vips_Lab2XYZ, vips_XYZ2scRGB, vips_scRGB2sRGB, NULL } },
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{ LAB, RGB16, { vips_Lab2XYZ, vips_XYZ2scRGB,
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vips_scRGB2RGB16, NULL } },
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{ LAB, YXY, { vips_Lab2XYZ, vips_XYZ2Yxy, NULL } },
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{ LABQ, XYZ, { vips_LabQ2Lab, vips_Lab2XYZ, NULL } },
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{ LABQ, LAB, { vips_LabQ2Lab, NULL } },
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{ LABQ, LCH, { vips_LabQ2Lab, vips_Lab2LCh, NULL } },
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{ LABQ, CMC, { vips_LabQ2Lab, vips_Lab2LCh, vips_LCh2CMC, NULL } },
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{ LABQ, LABS, { vips_LabQ2LabS, NULL } },
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{ LABQ, scRGB, { vips_LabQ2Lab, vips_Lab2XYZ, vips_XYZ2scRGB } },
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{ LABQ, sRGB, { vips_LabQ2sRGB, NULL } },
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{ LABQ, RGB16, { vips_LabQ2Lab, vips_Lab2XYZ, vips_XYZ2scRGB,
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vips_scRGB2RGB16, NULL } },
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{ LABQ, YXY, { vips_LabQ2Lab, vips_Lab2XYZ, vips_XYZ2Yxy, NULL } },
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{ LCH, XYZ, { vips_LCh2Lab, vips_Lab2XYZ, NULL } },
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{ LCH, LAB, { vips_LCh2Lab, NULL } },
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{ LCH, LABQ, { vips_LCh2Lab, vips_Lab2LabQ, NULL } },
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{ LCH, CMC, { vips_LCh2CMC, NULL } },
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{ LCH, LABS, { vips_LCh2Lab, vips_Lab2LabS, NULL } },
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{ LCH, scRGB, { vips_LCh2Lab, vips_Lab2XYZ, vips_XYZ2scRGB, NULL } },
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{ LCH, sRGB, { vips_LCh2Lab, vips_Lab2XYZ, vips_XYZ2scRGB,
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vips_scRGB2sRGB, NULL } },
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{ LCH, RGB16, { vips_LCh2Lab, vips_Lab2XYZ, vips_XYZ2scRGB,
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vips_scRGB2RGB16, NULL } },
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{ LCH, YXY, { vips_LCh2Lab, vips_Lab2XYZ, vips_XYZ2Yxy, NULL } },
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{ CMC, XYZ, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2XYZ, NULL } },
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{ CMC, LAB, { vips_CMC2LCh, vips_LCh2Lab, NULL } },
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{ CMC, LABQ, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2LabQ, NULL } },
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{ CMC, LCH, { vips_CMC2LCh, NULL } },
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{ CMC, LABS, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2LabS, NULL } },
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{ CMC, scRGB, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2XYZ,
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vips_XYZ2scRGB, NULL } },
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{ CMC, sRGB, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2XYZ,
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vips_XYZ2scRGB, vips_scRGB2sRGB, NULL } },
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{ CMC, RGB16, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2XYZ,
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vips_XYZ2scRGB, vips_scRGB2RGB16, NULL } },
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{ CMC, YXY, { vips_CMC2LCh, vips_LCh2Lab, vips_Lab2XYZ,
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vips_XYZ2Yxy, NULL } },
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{ LABS, XYZ, { vips_LabS2Lab, vips_Lab2XYZ, NULL } },
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{ LABS, LAB, { vips_LabS2Lab, NULL } },
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{ LABS, LABQ, { vips_LabS2LabQ, NULL } },
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{ LABS, LCH, { vips_LabS2Lab, vips_Lab2LCh, NULL } },
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{ LABS, CMC, { vips_LabS2Lab, vips_Lab2LCh, vips_LCh2CMC, NULL } },
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{ LABS, scRGB, { vips_LabS2Lab, vips_Lab2XYZ, vips_XYZ2scRGB, NULL } },
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{ LABS, sRGB, { vips_LabS2Lab, vips_Lab2XYZ, vips_XYZ2scRGB,
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vips_scRGB2sRGB, NULL } },
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{ LABS, RGB16, { vips_LabS2Lab, vips_Lab2XYZ, vips_XYZ2scRGB,
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vips_scRGB2RGB16, NULL } },
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{ LABS, YXY, { vips_LabS2Lab, vips_Lab2XYZ, vips_XYZ2Yxy, NULL } },
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{ scRGB, XYZ, { vips_scRGB2XYZ, NULL } },
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{ scRGB, LAB, { vips_scRGB2XYZ, vips_XYZ2Lab, NULL } },
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{ scRGB, LABQ, { vips_scRGB2XYZ, vips_XYZ2Lab, vips_Lab2LabQ, NULL } },
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{ scRGB, LCH, { vips_scRGB2XYZ, vips_XYZ2Lab, vips_Lab2LCh, NULL } },
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{ scRGB, CMC, { vips_scRGB2XYZ, vips_XYZ2Lab,
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vips_Lab2LCh, vips_LCh2CMC, NULL } },
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{ scRGB, sRGB, { vips_scRGB2sRGB, NULL } },
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{ scRGB, LABS, { vips_scRGB2XYZ, vips_XYZ2Lab, vips_Lab2LabS, NULL } },
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{ scRGB, RGB16, { vips_scRGB2RGB16, NULL } },
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{ scRGB, YXY, { vips_scRGB2XYZ, vips_XYZ2Yxy, NULL } },
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{ sRGB, XYZ, { vips_sRGB2scRGB, vips_scRGB2XYZ, NULL } },
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{ sRGB, LAB, { vips_sRGB2scRGB, vips_scRGB2XYZ, vips_XYZ2Lab, NULL } },
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{ sRGB, LABQ, { vips_sRGB2scRGB, vips_scRGB2XYZ, vips_XYZ2Lab,
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vips_Lab2LabQ, NULL } },
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{ sRGB, LCH, { vips_sRGB2scRGB, vips_scRGB2XYZ, vips_XYZ2Lab,
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vips_Lab2LCh, NULL } },
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{ sRGB, CMC, { vips_sRGB2scRGB, vips_scRGB2XYZ, vips_XYZ2Lab,
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vips_Lab2LCh, vips_LCh2CMC, NULL } },
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{ sRGB, scRGB, { vips_sRGB2scRGB, NULL } },
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{ sRGB, LABS, { vips_sRGB2scRGB, vips_scRGB2XYZ, vips_XYZ2Lab,
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vips_Lab2LabS, NULL } },
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{ sRGB, RGB16, { vips_sRGB2scRGB, vips_scRGB2RGB16, NULL } },
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{ sRGB, YXY, { vips_sRGB2scRGB, vips_scRGB2XYZ, vips_XYZ2Yxy, NULL } },
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{ YXY, XYZ, { vips_Yxy2XYZ, NULL } },
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{ YXY, LAB, { vips_Yxy2XYZ, vips_XYZ2Lab, NULL } },
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{ YXY, LABQ, { vips_Yxy2XYZ, vips_XYZ2Lab, vips_Lab2LabQ, NULL } },
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{ YXY, LCH, { vips_Yxy2XYZ, vips_XYZ2Lab, vips_Lab2LCh, NULL } },
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{ YXY, CMC, { vips_Yxy2XYZ, vips_XYZ2Lab, vips_Lab2LCh,
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vips_LCh2CMC, NULL } },
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{ YXY, LABS, { vips_Yxy2XYZ, vips_XYZ2Lab, vips_Lab2LabS, NULL } },
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{ YXY, scRGB, { vips_Yxy2XYZ, vips_XYZ2scRGB, NULL } },
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{ YXY, sRGB, { vips_Yxy2XYZ, vips_XYZ2scRGB, vips_scRGB2sRGB, NULL } },
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{ YXY, RGB16, { vips_Yxy2XYZ, vips_XYZ2scRGB, vips_scRGB2RGB16, NULL } },
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};
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/* Is an image in a supported colourspace.
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*/
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/**
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* vips_colourspace_issupported:
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* @in: input image
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*
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* Test if @image is in a colourspace that vips_colourspace() can process. For
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* example, #VIPS_INTERPRETATION_RGB images are not in a well-defined
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* colourspace, but #VIPS_INTERPRETATION_sRGB ones are.
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*
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* Returns: %TRUE if @image is in a supported colourspace.
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*/
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gboolean
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vips_colourspace_issupported( const VipsImage *image )
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{
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VipsInterpretation interpretation;
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int i;
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/* Treat RGB and RGB16 as sRGB. If you want some other treatment,
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* you'll need to use the icc funcs.
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*
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* sRGB2XYZ can handle 8 and 16-bit images.
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*/
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interpretation = vips_image_guess_interpretation( image );
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if( interpretation == VIPS_INTERPRETATION_RGB ||
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interpretation == VIPS_INTERPRETATION_RGB16 )
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interpretation = VIPS_INTERPRETATION_sRGB;
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for( i = 0; i < VIPS_NUMBER( vips_colour_routes ); i++ )
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if( vips_colour_routes[i].from == interpretation )
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return( TRUE );
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return( FALSE );
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}
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typedef struct _VipsColourspace {
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VipsOperation parent_instance;
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VipsImage *in;
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VipsImage *out;
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VipsInterpretation space;
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} VipsColourspace;
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typedef VipsOperationClass VipsColourspaceClass;
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G_DEFINE_TYPE( VipsColourspace, vips_colourspace, VIPS_TYPE_OPERATION );
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static int
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vips_colourspace_build( VipsObject *object )
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{
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VipsColourspace *colourspace = (VipsColourspace *) object;
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int i, j;
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VipsImage *x;
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VipsImage **t;
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VipsInterpretation interpretation;
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t = (VipsImage **) vips_object_local_array( object, MAX_STEPS );
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/* Verify that all input args have been set.
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*/
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if( VIPS_OBJECT_CLASS( vips_colourspace_parent_class )->
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build( object ) )
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return( -1 );
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interpretation = vips_image_guess_interpretation( colourspace->in );
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/* Treat RGB and RGB16 as sRGB. If you want some other treatment,
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* you'll need to use the icc funcs.
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*
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* sRGB2XYZ can handle 8 and 16-bit images.
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*/
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if( interpretation == VIPS_INTERPRETATION_RGB ||
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interpretation == VIPS_INTERPRETATION_RGB16 )
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interpretation = VIPS_INTERPRETATION_sRGB;
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/* No conversion necessary.
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*/
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if( interpretation == colourspace->space ) {
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g_object_set( colourspace, "out", vips_image_new(), NULL );
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return( vips_image_write( colourspace->in, colourspace->out ) );
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}
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x = colourspace->in;
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for( i = 0; i < VIPS_NUMBER( vips_colour_routes ); i++ )
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if( vips_colour_routes[i].from == interpretation &&
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vips_colour_routes[i].to == colourspace->space )
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break;
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if( i == VIPS_NUMBER( vips_colour_routes ) ) {
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vips_error( "vips_colourspace",
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_( "no known route between '%s' and '%s'" ),
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vips_enum_nick( VIPS_TYPE_INTERPRETATION,
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interpretation ),
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vips_enum_nick( VIPS_TYPE_INTERPRETATION,
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colourspace->space ) );
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return( -1 );
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}
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for( j = 0; vips_colour_routes[i].route[j]; j++ ) {
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if( vips_colour_routes[i].route[j]( x, &t[j], NULL ) )
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return( -1 );
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x = t[j];
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}
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g_object_set( colourspace, "out", vips_image_new(), NULL );
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if( vips_image_write( x, colourspace->out ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_colourspace_class_init( VipsColourspaceClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "colourspace";
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vobject_class->description = _( "convert to a new colourspace" );
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vobject_class->build = vips_colourspace_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsColourspace, in ) );
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VIPS_ARG_IMAGE( class, "out", 2,
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_( "Output" ),
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_( "Output image" ),
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VIPS_ARGUMENT_REQUIRED_OUTPUT,
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G_STRUCT_OFFSET( VipsColourspace, out ) );
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VIPS_ARG_ENUM( class, "space", 6,
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_( "Space" ),
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_( "Destination colour space" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsColourspace, space ),
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VIPS_TYPE_INTERPRETATION, VIPS_INTERPRETATION_sRGB );
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}
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static void
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vips_colourspace_init( VipsColourspace *colourspace )
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{
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}
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/**
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* vips_colourspace:
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* @in: input image
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* @out: output image
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* @space: convert to this colour space
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*
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* This operation looks at the interpretation field of @in and runs
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* a set of colourspace conversion functions to move it to @space.
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*
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* For example, given an image tagged as #VIPS_INTERPRETATION_YXY, running
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* vips_colourspace() with @space set to #VIPS_INTERPRETATION_LAB will
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* convert with vips_Yxy2XYZ() and vips_XYZ2Lab().
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*
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* See also: vips_colourspace_issupported(),
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* vips_image_guess_interpretation().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_colourspace( VipsImage *in, VipsImage **out,
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VipsInterpretation space, ... )
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{
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va_list ap;
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int result;
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va_start( ap, space );
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result = vips_call_split( "colourspace", ap, in, out, space );
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va_end( ap );
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return( result );
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}
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