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/* Various functions relating to tone curve adjustment.
*
* Author: John Cupitt
* Written on: 18/7/1995
* 17/9/96 JC
* - restrictions on Ps, Pm, Ph relaxed
* - restrictions on S, M, H relaxed
* 25/7/01 JC
* - patched for im_extract_band() change
* 11/7/04
* - generalised to im_tone_build_range() ... so you can use it for any
* image, not just LabS
* 26/3/10
* - cleanups
* - gtkdoc
*/
/*
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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 <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/vips7compat.h>
/**
* im_tone_map:
* @in: input image
* @out: output image
* @lut: look-up table
*
* Map the first channel of @in through @lut. If @in is IM_CODING_LABQ, unpack
* to LABS, map L and then repack.
*
* @in should be a LABS or LABQ image for this to work
* sensibly.
*
* See also: im_maplut().
*
* Returns: 0 on success, -1 on error
*/
int
im_tone_map( IMAGE *in, IMAGE *out, IMAGE *lut )
{
IMAGE *t[8];
if( im_check_hist( "im_tone_map", lut ) ||
im_open_local_array( out, t, 8, "im_tone_map", "p" ) )
return( -1 );
/* If in is IM_CODING_LABQ, unpack.
*/
if( in->Coding == IM_CODING_LABQ ) {
if( im_LabQ2LabS( in, t[0] ) )
return( -1 );
}
else
t[0] = in;
/* Split into bands.
*/
if( im_extract_band( t[0], t[1], 0 ) )
return( -1 );
if( t[0]->Bands > 1 ) {
if( im_extract_bands( t[0], t[2], 1, t[0]->Bands - 1 ) )
return( -1 );
}
/* Map L.
*/
if( im_maplut( t[1], t[3], lut ) )
return( -1 );
/* Recombine bands.
*/
if( t[0]->Bands > 1 ) {
if( im_bandjoin( t[3], t[2], t[4] ) )
return( -1 );
}
else
t[4] = t[3];
/* If input was LabQ, repack.
*/
if( in->Coding == IM_CODING_LABQ ) {
if( im_LabS2LabQ( t[4], t[5] ) )
return( -1 );
}
else
t[5] = t[4];
return( im_copy( t[4], out ) );
}
/**
* im_tone_analyse:
* @in: input image
* @out: output image
* @Ps: shadow point (eg. 0.2)
* @Pm: mid-tone point (eg. 0.5)
* @Ph: highlight point (eg. 0.8)
* @S: shadow adjustment (+/- 30)
* @M: mid-tone adjustment (+/- 30)
* @H: highlight adjustment (+/- 30)
*
* As im_tone_build(), but analyse the histogram of @in and use it to
* pick the 0.1% and 99.9% points for @Lb and @Lw.
*
* See also: im_tone_build().
*
* Returns: 0 on success, -1 on error
*/
int
im_tone_analyse(
IMAGE *in,
IMAGE *out,
double Ps, double Pm, double Ph,
double S, double M, double H )
{
IMAGE *t[4];
int low, high;
double Lb, Lw;
if( im_open_local_array( out, t, 4, "im_tone_map", "p" ) )
return( -1 );
/* If in is IM_CODING_LABQ, unpack.
*/
if( in->Coding == IM_CODING_LABQ ) {
if( im_LabQ2LabS( in, t[0] ) )
return( -1 );
}
else
t[0] = in;
/* Should now be 3-band short.
*/
if( im_check_uncoded( "im_tone_analyse", t[0] ) ||
im_check_bands( "im_tone_analyse", t[0], 3 ) ||
im_check_format( "im_tone_analyse", t[0], IM_BANDFMT_SHORT ) )
return( -1 );
if( im_extract_band( t[0], t[1], 0 ) ||
im_clip2fmt( t[1], t[2], IM_BANDFMT_USHORT ) )
return( -1 );
if( im_mpercent( t[2], 0.1 / 100.0, &high ) ||
im_mpercent( t[2], 99.9 / 100.0, &low ) )
return( -1 );
Lb = 100 * low / 32768;
Lw = 100 * high / 32768;
im_diag( "im_tone_analyse", "set Lb = %g, Lw = %g", Lb, Lw );
return( im_tone_build( out, Lb, Lw, Ps, Pm, Ph, S, M, H ) );
}
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