235 lines
6.9 KiB
C
235 lines
6.9 KiB
C
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/* Definitions for VIPS colour package.
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*
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* J.Cupitt, 8/4/93
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* 15/7/96 JC
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* - C++ stuff added
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* 20/2/98 JC
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* - new display calibration added
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* 26/9/05
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* - added IM_ prefix to colour temps
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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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#ifndef IM_COLOUR_H
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#define IM_COLOUR_H
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#ifdef __cplusplus
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extern "C" {
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#endif /*__cplusplus*/
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#include <vips/util.h>
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/* Convert degrees->rads and vice-versa.
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*/
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#define IM_RAD( r ) (((r) / 360.0) * 2.0 * IM_PI)
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#define IM_DEG( a ) (((a) / (2.0 * IM_PI)) * 360.0)
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/* Areas under curves for Dxx. 2 degree observer.
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*/
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#define IM_D93_X0 (89.7400)
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#define IM_D93_Y0 (100.0)
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#define IM_D93_Z0 (130.7700)
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#define IM_D75_X0 (94.9682)
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#define IM_D75_Y0 (100.0)
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#define IM_D75_Z0 (122.5710)
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/* D65 temp 6504.
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*/
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#define IM_D65_X0 (95.0470)
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#define IM_D65_Y0 (100.0)
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#define IM_D65_Z0 (108.8827)
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#define IM_D55_X0 (95.6831)
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#define IM_D55_Y0 (100.0)
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#define IM_D55_Z0 (92.0871)
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#define IM_D50_X0 (96.4250)
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#define IM_D50_Y0 (100.0)
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#define IM_D50_Z0 (82.4680)
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/* A temp 2856k.
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*/
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#define IM_A_X0 (109.8503)
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#define IM_A_Y0 (100.0)
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#define IM_A_Z0 (35.5849)
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/* B temp 4874k.
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*/
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#define IM_B_X0 (99.0720)
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#define IM_B_Y0 (100.0)
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#define IM_B_Z0 (85.2230)
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/* C temp 6774k.
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*/
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#define IM_C_X0 (98.0700)
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#define IM_C_Y0 (100.0)
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#define IM_C_Z0 (118.2300)
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#define IM_E_X0 (100.0)
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#define IM_E_Y0 (100.0)
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#define IM_E_Z0 (100.0)
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#define IM_D3250_X0 (105.6590)
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#define IM_D3250_Y0 (100.0)
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#define IM_D3250_Z0 (45.8501)
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/* Two kinds of display. A DISP_BARCO does gamma correction etc etc for us and
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* needs only a colour space transform, a DISP_DUMB is an ordinary display and
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* needs a full range of corrections.
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*/
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enum im_col_disp_type {
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DISP_BARCO = 0,
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DISP_DUMB
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};
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/* Structure for holding information about a display device. See the BARCO
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* papers for details on the fields.
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*/
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struct im_col_display {
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char *d_name; /* Display name */
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enum im_col_disp_type d_type; /* Display type */
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float d_mat[3][3]; /* XYZ -> luminance matrix */
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float d_YCW; /* Luminosity of reference white */
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float d_xCW; /* x, y for reference white */
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float d_yCW;
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float d_YCR; /* Light o/p for reference white */
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float d_YCG;
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float d_YCB;
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int d_Vrwr; /* Pixel values for ref. white */
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int d_Vrwg;
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int d_Vrwb;
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float d_Y0R; /* Residual light for black pixel */
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float d_Y0G;
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float d_Y0B;
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float d_gammaR; /* Gamma values for the three guns */
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float d_gammaG;
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float d_gammaB;
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float d_B; /* 'Background' (like brightness) */
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float d_P; /* 'Picture' (like contrast) */
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};
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/* Structure for holding the lookup tables for XYZ<=>rgb conversion.
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* Also holds the luminance to XYZ matrix and the inverse one.
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*/
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struct im_col_tab_disp {
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float t_Yr2r[1501]; /* Conversion of Yr to r */
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float t_Yg2g[1501]; /* Conversion of Yg to g */
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float t_Yb2b[1501]; /* Conversion of Yb to b */
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float t_r2Yr[1501]; /* Conversion of r to Yr */
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float t_g2Yg[1501]; /* Conversion of g to Yg */
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float t_b2Yb[1501]; /* Conversion of b to Yb */
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float mat_XYZ2lum[3][3]; /* XYZ to Yr, Yg, Yb matrix */
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float mat_lum2XYZ[3][3]; /* Yr, Yg, Yb to XYZ matrix */
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float rstep, gstep, bstep;
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float ristep, gistep, bistep;
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};
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/* Colour loading and conversion functions.
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*/
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void im_col_ab2Ch( float a, float b, float *C, float *h );
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void im_col_LCh2ab( float L, float C, float h, float *a, float *b );
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void im_col_XYZ2Lab( float X, float Y, float Z, float *L, float *a, float *b );
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void im_col_Lab2XYZ( float L, float a, float b, float *X, float *Y, float *Z );
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float im_col_pythagoras( float L1, float a1, float b1,
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float L2, float a2, float b2 );
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struct im_col_tab_disp *im_col_make_tables_RGB(
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IMAGE *im,
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struct im_col_display *d );
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int im_col_rgb2XYZ( struct im_col_display *d,
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struct im_col_tab_disp *table,
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int r, int g, int b,
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float *X, float *Y, float *Z );
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int im_col_XYZ2rgb(
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struct im_col_display *d, struct im_col_tab_disp *table,
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float X, float Y, float Z,
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int *r_ret, int *g_ret, int *b_ret,
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int *or_ret );
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float im_col_L2Lucs( float L );
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float im_col_Lucs2L( float Lucs );
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float im_col_C2Cucs( float C );
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float im_col_Cucs2C( float Cucs );
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float im_col_Ch2hucs( float C, float h );
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float im_col_Chucs2h( float C, float hucs );
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double im_col_ab2h( double a, double b );
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int im_ICC2display( char *filename, struct im_col_display *dpy );
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int im_XYZ2disp( IMAGE *, IMAGE *, struct im_col_display * );
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int im_Lab2disp( IMAGE *, IMAGE *, struct im_col_display * );
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int im_LabQ2disp( IMAGE *, IMAGE *, struct im_col_display * );
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int im_disp2XYZ( IMAGE *, IMAGE *, struct im_col_display * );
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int im_disp2Lab( IMAGE *, IMAGE *, struct im_col_display * );
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void *im_LabQ2disp_build_table( IMAGE *out, struct im_col_display *d );
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int im_LabQ2disp_table( IMAGE *in, IMAGE *out, void *table );
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int im_dE_fromdisp( IMAGE *, IMAGE *, IMAGE *, struct im_col_display * );
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int im_dECMC_fromdisp( IMAGE *, IMAGE *, IMAGE *, struct im_col_display * );
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int im_dE00_fromLab( IMAGE *, IMAGE *, IMAGE * );
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/* Colour display values and arrays
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&im_col_screen_white, index 0
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&im_col_SPARC_white, index 1
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&im_col_D65_white, index 2
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&im_col_barco_white, index 3
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&im_col_mitsubishi, index 4
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&im_col_relative, index 5
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&ultra2, index 6
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&srgb_profile, index 7
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*/
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struct im_col_display *im_col_displays( int );
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struct im_col_display *im_col_display_name( const char * );
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/* Render intents for icc wrappers.
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*/
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#define IM_INTENT_PERCEPTUAL (0)
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#define IM_INTENT_RELATIVE_COLORIMETRIC (1)
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#define IM_INTENT_SATURATION (2)
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#define IM_INTENT_ABSOLUTE_COLORIMETRIC (3)
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int im_icc_present( void );
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int im_icc_transform( IMAGE *in, IMAGE *out,
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const char *input_profile_filename,
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const char *output_profile_filename,
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int intent );
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int im_icc_import( IMAGE *in, IMAGE *out,
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const char *input_profile_filename, int intent );
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int im_icc_import_embedded( IMAGE *in, IMAGE *out, int intent );
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int im_icc_export( IMAGE *in, IMAGE *out,
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const char *output_profile_filename, int intent );
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int im_icc_export_depth( IMAGE *in, IMAGE *out, int depth,
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const char *output_profile_filename, int intent );
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int im_icc_ac2rc( IMAGE *in, IMAGE *out, const char *profile_filename );
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#ifdef __cplusplus
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}
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#endif /*__cplusplus*/
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#endif /*IM_COLOUR_H*/
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