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