246 lines
5.3 KiB
C
246 lines
5.3 KiB
C
/* Turn XYZ files into displayable rgb.
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*
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* Author: J-P. Laurent
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* Modified:
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* 15/11/94 JC
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* - error message added
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* - out->Type set to IM_TYPE_RGB
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* - memory leak fixed
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* 16/11/94 JC
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* - uses im_wrapone()
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* 15/2/95 JC
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* - oops! now uses PEL, not float for output pointer
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* 2/1/96 JC
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* - sometimes produced incorrect result at extrema
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* - reformatted
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* - now uses IM_RINT() and clip()
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* 18/9/96 JC
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* - some speed-ups ... 3x faster
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* - slightly less accurate, but who cares
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* - added out-of-mem check for table build
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* 21/9/12
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* - redone as a class
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* - sRGB only, support for other RGBs is now via lcms
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* 6/11/12
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* - added 16-bit option
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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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#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 <math.h>
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#include <vips/vips.h>
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#include "colour.h"
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typedef struct _VipsXYZ2sRGB {
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VipsColourCode parent_instance;
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int depth;
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} VipsXYZ2sRGB;
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typedef VipsColourCodeClass VipsXYZ2sRGBClass;
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G_DEFINE_TYPE( VipsXYZ2sRGB, vips_XYZ2sRGB, VIPS_TYPE_COLOUR_CODE );
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/* Process a buffer of data.
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*/
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static void
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vips_XYZ2sRGB_line_8( VipsPel *q, float *p, int width )
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{
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int i;
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for( i = 0; i < width; i++ ) {
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float X = p[0];
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float Y = p[1];
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float Z = p[2];
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float R, G, B;
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int r, g, b;
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int or;
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vips_col_XYZ2scRGB( X, Y, Z, &R, &G, &B );
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vips_col_scRGB2sRGB_8( R, G, B, &r, &g, &b, &or );
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p += 3;
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q[0] = r;
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q[1] = g;
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q[2] = b;
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q += 3;
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}
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}
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static void
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vips_XYZ2sRGB_line_16( unsigned short *q, float *p, int width )
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{
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int i;
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for( i = 0; i < width; i++ ) {
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float X = p[0];
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float Y = p[1];
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float Z = p[2];
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float R, G, B;
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int r, g, b;
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int or;
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vips_col_XYZ2scRGB( X, Y, Z, &R, &G, &B );
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vips_col_scRGB2sRGB_16( R, G, B, &r, &g, &b, &or );
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p += 3;
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q[0] = r;
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q[1] = g;
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q[2] = b;
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q += 3;
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}
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}
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static void
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vips_XYZ2sRGB_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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VipsXYZ2sRGB *XYZ2sRGB = (VipsXYZ2sRGB *) colour;
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if( XYZ2sRGB->depth == 16 )
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vips_XYZ2sRGB_line_16( (unsigned short *) out, (float *) in[0],
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width );
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else
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vips_XYZ2sRGB_line_8( (VipsPel *) out, (float *) in[0], width );
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}
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static int
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vips_XYZ2sRGB_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsXYZ2sRGB *XYZ2sRGB = (VipsXYZ2sRGB *) object;
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VipsColour *colour = VIPS_COLOUR( XYZ2sRGB );
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switch( XYZ2sRGB->depth ) {
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case 16:
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colour->interpretation = VIPS_INTERPRETATION_RGB16;
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colour->format = VIPS_FORMAT_USHORT;
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break;
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case 8:
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colour->interpretation = VIPS_INTERPRETATION_sRGB;
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colour->format = VIPS_FORMAT_UCHAR;
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break;
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default:
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vips_error( class->nickname,
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"%s", _( "depth must be 8 or 16" ) );
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return( -1 );
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}
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if( VIPS_OBJECT_CLASS( vips_XYZ2sRGB_parent_class )->build( object ) )
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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_XYZ2sRGB_class_init( VipsXYZ2sRGBClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsColourClass *colour_class = VIPS_COLOUR_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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object_class->nickname = "XYZ2sRGB";
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object_class->description = _( "convert an XYZ image to sRGB" );
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object_class->build = vips_XYZ2sRGB_build;
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colour_class->process_line = vips_XYZ2sRGB_line;
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VIPS_ARG_INT( class, "depth", 130,
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_( "Depth" ),
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_( "Output device space depth in bits" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsXYZ2sRGB, depth ),
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8, 16, 8 );
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}
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static void
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vips_XYZ2sRGB_init( VipsXYZ2sRGB *XYZ2sRGB )
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{
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VipsColour *colour = VIPS_COLOUR( XYZ2sRGB );
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VipsColourCode *code = VIPS_COLOUR_CODE( XYZ2sRGB );
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/* Just the default, can be overridden, see above.
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*/
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colour->coding = VIPS_CODING_NONE;
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colour->interpretation = VIPS_INTERPRETATION_sRGB;
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colour->format = VIPS_FORMAT_UCHAR;
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colour->bands = 3;
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code->input_coding = VIPS_CODING_NONE;
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code->input_bands = 3;
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code->input_format = VIPS_FORMAT_FLOAT;
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XYZ2sRGB->depth = 8;
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}
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/**
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* vips_XYZ2sRGB:
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* @in: input image
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* @out: output image
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*
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* Optional arguments:
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*
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* @depth: depth of output image in bits
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*
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* Convert an XYZ image to sRGB. Set @depth to 16 to get 16-bit output.
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*
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* See also: im_LabS2LabQ(), im_XYZ2sRGB(), im_rad2float().
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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_XYZ2sRGB( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "XYZ2sRGB", ap, in, out );
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va_end( ap );
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return( result );
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}
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