gronod/argyllcms
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 11 Wiki Activity
Files
main
argyllcms/xicc/fakeCMY.c
T
gronod 45bdf51201 Initial commit of v3.5.0
2026-08-20 20:28:40 +01:00

536 lines
15 KiB
C
Raw Permalink Blame History

/*
* Create a synthetic .ti3 file for a CMY "device",
* that exactly maps to the surface points and neutral
* axis of the CMYK profile it is derived from.
*
* Author: Graeme W. Gill
* Date: 2004/6/27
* Version: 1.00
*
* Copyright 2004 Graeme W. Gill
* Please refer to License.txt file for details.
*/
/* TTBD:
*
* Add a flag to create RGB instead, by simply inverting the CMY values
* when writing to the .ti3 file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <fcntl.h>
#include <string.h>
#include <math.h>
#include "copyright.h"
#include "aconfig.h"
#include "numlib.h"
#include "icc.h"
#include "conv.h"
#include "xicc.h"
#include "cgats.h"
#include "targen.h"
#define EXTRA_NEUTRAL 50 /* Crude way of increasing weighting */
/* ---------------------------------------- */
void usage(char *diag) {
fprintf(stderr,"Create a fake CMY data file from a CMYK profile, Version %s\n",ARGYLL_VERSION_STR);
fprintf(stderr,"Author: Graeme W. Gill, licensed under the AGPL Version 3\n");
fprintf(stderr,"usage: fakeCMY [option] profile.icm fake.ti3\n");
if (diag != NULL)
fprintf(stderr,"Diagnostic: %s\n",diag);
fprintf(stderr," -v verbose\n");
fprintf(stderr," -r res set surface point resolution (default 3)\n");
fprintf(stderr," -l tlimit set total ink limit, 0 - 400%% (estimate by default)\n");
fprintf(stderr," -L klimit set black ink limit, 0 - 100%% (estimate by default)\n");
fprintf(stderr," -g output fake RGB values instead of CMY\n");
fprintf(stderr,"profile%s CMYK ICC input profile to use\n",ICC_FILE_EXT);
fprintf(stderr,"outfile.ti3 Name for output .ti3 file\n");
exit(1);
}
/* Fake up a vector direction clip in Lab space */
static void visect(
icxLuBase *luo, /* xicc lookup object */
double *pout, /* PCS result (may be NULL) */
double *dout, /* Device result (may be NULL) */
double *orig, /* Origin of vector (PCS) */
double *vec /* Input vector (PCS) */
) {
int i;
int rv;
double sum, step, inc[3]; /* 1 Delta E increment */
double try[3]; /* Trial PCS */
double res[4]; /* Trial result device values */
for (sum = 0.0, i = 0; i < 3; i++) {
double tt = vec[i] - orig[i];
sum += tt * tt;
}
sum = sqrt(sum);
for (i = 0; i < 3; i++) {
inc[i] = (vec[i] - orig[i])/sum;
}
//printf("~1 orig %f %f %f, vec %f %f %f\n",orig[0],orig[1],orig[2],vec[0],vec[1],vec[3]);
//printf("~1 inc %f %f %f\n",inc[0],inc[1],inc[2]);
/* Increment in vector direction until we clip */
for (i = 0; i < 3; i++)
try[i] = 0.5 * (orig[i] + vec[i]);
for (step = 20.0;;) {
rv = luo->inv_lookup(luo, res, try);
if (rv > 1)
error ("inv_lookup failed");
//printf("~1 trial %f %f %f returned %d\n",try[0],try[1],try[2],rv);
if (rv == 1) {
if (step <= 0.1)
break;
/* Back off, and use smaller steps */
for (i = 0; i < 3; i++)
try[i] -= step * inc[i];
step *= 0.5;
}
for (i = 0; i < 3; i++)
try[i] += step * inc[i];
}
if (dout != NULL)
for (i = 0; i < 3; i++)
dout[i] = res[i];
/* Lookup the clipped PCS */
if (pout != NULL)
luo->lookup(luo, pout, res);
}
int main(int argc, char *argv[]) {
int fa,nfa; /* argument we're looking at */
int verb = 0;
int dorgb = 0; /* Create fake RGB values */
double tlimit = -1.0; /* Total ink limit */
double klimit = -1.0; /* Black ink limit */
int tres = 3; /* Resolution of suface grid */
int gres = tres+2; /* Resolution of grey points */
static char in_name[MAXNAMEL+1];
static char out_name[MAXNAMEL+1];
icmFile *rd_fp;
icc *rd_icco;
icmErr err = { 0, { '\000'} };
int rv = 0;
icColorSpaceSignature ins, outs; /* Type of input and output spaces */
xicc *xicco;
icxLuBase *luo;
icxInk ink; /* Ink parameters */
fxpos *fxlist = NULL; /* Fixed point list for full spread */
int fxlist_a = 0; /* Fixed point list allocation */
int fxno = 0; /* The number of fixed points */
int gc[MXTD]; /* Grid coordinate */
cgats *ocg; /* output cgats structure */
time_t clk = time(0);
struct tm *tsp = localtime(&clk);
char *atm = asctime(tsp); /* Ascii time */
int i, j;
error_program = argv[0];
if (argc < 2)
usage("Not enough arguments");
/* Process the arguments */
for (fa = 1;fa < argc;fa++) {
nfa = fa; /* skip to nfa if next argument is used */
if (argv[fa][0] == '-') { /* Look for any flags */
char *na = NULL; /* next argument after flag, null if none */
if (argv[fa][2] != '\000')
na = &argv[fa][2]; /* next is directly after flag */
else {
if ((fa+1) < argc) {
if (argv[fa+1][0] != '-') {
nfa = fa + 1;
na = argv[nfa]; /* next is seperate non-flag argument */
}
}
}
/* Verbosity */
if (argv[fa][1] == 'v') {
verb = 1;
}
/* Ink limits */
else if (argv[fa][1] == 'l') {
fa = nfa;
if (na == NULL) usage("No parameter after flag -l");
tlimit = atoi(na)/100.0;
}
else if (argv[fa][1] == 'L') {
fa = nfa;
if (na == NULL) usage("No parameter after flag -L");
klimit = atoi(na)/100.0;
}
/* Resolution */
else if (argv[fa][1] == 'r') {
fa = nfa;
if (na == NULL) usage("No parameter after flag -r");
tres = atoi(na);
}
/* RGB ? */
else if (argv[fa][1] == 'g') {
dorgb = 1;
}
else if (argv[fa][1] == '?')
usage(NULL);
else
usage("Unknown flag");
}
else
break;
}
if (fa >= argc || argv[fa][0] == '-') usage("Expected input profile name");
strncpy(in_name,argv[fa++],MAXNAMEL); in_name[MAXNAMEL] = '\000';
if (fa >= argc || argv[fa][0] == '-') usage("Expected output .ti3 name");
strncpy(out_name,argv[fa++],MAXNAMEL); out_name[MAXNAMEL] = '\000';
/* Open up the file for reading */
if ((rd_fp = new_icmFileStd_name(&err,in_name,"r")) == NULL)
error ("Read: Can't open file '%s' (0x%x, '%s')",in_name,err.c,err.m);
if ((rd_icco = new_icc(&err)) == NULL)
error ("Read: Creation of ICC object failed (0x%x, '%s')",err.c,err.m);
/* Read the header and tag list */
if ((rv = rd_icco->read(rd_icco,rd_fp,0)) != 0)
error ("Read: %d, %s",rv,rd_icco->e.m);
/* Wrap with an expanded icc */
if ((xicco = new_xicc(rd_icco)) == NULL)
error ("Creation of xicc failed");
/* Setup ink limit */
/* Set the default ink limits if not set on command line */
icxDefaultLimits(xicco, &ink.tlimit, tlimit, &ink.klimit, klimit);
if (verb) {
if (ink.tlimit >= 0.0)
printf("Total ink limit assumed is %3.0f%%\n",100.0 * ink.tlimit);
if (ink.klimit >= 0.0)
printf("Black ink limit assumed is %3.0f%%\n",100.0 * ink.klimit);
}
ink.c.Ksmth = ICXINKDEFSMTH; /* Default smoothing */
ink.c.Kskew = ICXINKDEFSKEW; /* default curve skew */
ink.c.Kstle = 0.5; /* Min K at white end */
ink.c.Kstpo = 0.5; /* Start of transition is at white */
ink.c.Kenle = 0.5; /* Max K at black end */
ink.c.Kenpo = 0.5; /* End transition at black */
ink.c.Kshap = 1.0; /* Linear transition */
gres = tres + 2;
/* Get a Device to PCS conversion object */
if ((luo = xicco->get_luobj(xicco, ICX_CLIP_NEAREST, icmFwd, icAbsoluteColorimetric, icSigLabData, icmLuOrdNorm, NULL, &ink)) == NULL) {
error ("%d, %s",rd_icco->e.c, rd_icco->e.m);
}
/* Get details of conversion */
luo->spaces(luo, &ins, NULL, &outs, NULL, NULL, NULL, NULL, NULL);
if (ins != icSigCmykData) {
error("Expecting CMYK device");
}
/* Make a default allocation */
fxlist_a = 4;
if ((fxlist = (fxpos *)malloc(sizeof(fxpos) * fxlist_a)) == NULL)
error ("Failed to malloc fxlist");
/* init coords */
for (j = 0; j < 3; j++)
gc[j] = 0;
/* Add CMY grid surface points */
for (;;) { /* Generate all grid points */
/* Check if this position is on the CMY surface */
for (j = 0; j < 3; j++) {
if (gc[j] == 0 || gc[j] == (tres-1))
break;
}
if (j < 3) { /* On the surface, so add a point */
/* Make sure there is room */
if (fxno >= fxlist_a) {
fxlist_a *= 2;
if ((fxlist = (fxpos *)realloc(fxlist, sizeof(fxpos) * fxlist_a)) == NULL)
error ("Failed to malloc fxlist");
}
for (j = 0; j < 3; j++)
fxlist[fxno].p[j] = gc[j]/(tres-1.0);
fxlist[fxno].p[3] = 0.0; /* K = 0 */
fxno++;
}
/* Increment grid index and position */
for (j = 0; j < 3; j++) {
gc[j]++;
if (gc[j] < tres)
break; /* No carry */
gc[j] = 0;
}
if (j >= 3)
break; /* Done grid */
}
/* Add neutral axis points */
for (i = 1; i < ((EXTRA_NEUTRAL * gres)-1); i++) {
/* Make sure there is room */
if (fxno >= fxlist_a) {
fxlist_a *= 2;
if ((fxlist = (fxpos *)realloc(fxlist, sizeof(fxpos) * fxlist_a)) == NULL)
error ("Failed to malloc fxlist");
}
for (j = 0; j < 3; j++)
fxlist[fxno].p[j] = i/((EXTRA_NEUTRAL * gres)-1.0);
fxlist[fxno].p[3] = 0.0; /* K = 0 */
fxno++;
}
/* Convert CMY values into CMY0 Lab values */
for (i = 0; i < fxno; i++) {
if ((rv = luo->lookup(luo, fxlist[i].v, fxlist[i].p)) > 1)
error ("%d, %s",rd_icco->e.c,rd_icco->e.m);
//printf("~1 initial lookup %f %f %f -> %f %f %f\n", fxlist[i].p[0], fxlist[i].p[1], fxlist[i].p[2], fxlist[i].v[0], fxlist[i].v[1], fxlist[i].v[2]);
}
/* A CMYK black will be deeper than CMY0, so we need to figure out */
/* how to scale the initial values to fully occupy the CMYK gamut. */
/* Figure out the general scale at the black end */
{
double dval[4];
double wt[3] = { 100.0, 0, 0 }; /* Approximate white PCS */
double ac[3] = { 50.0, 0, 0 }; /* Adjustment center */
double lab_wt[3]; /* Media Whitepoint PCS */
double xyz_wt[3]; /* Media Whitepoint PCS */
icmXYZNumber XYZ_WT;
double k_bk[3]; /* K black PCS */
double cmyk_bk[3]; /* CMYK black PCS */
double toAbs[3][3];
double fromAbs[3][3];
/* Discover the Lab of the CMYK media */
for (j = 0; j < 4; j++)
dval[j] = 0.0;
luo->lookup(luo, lab_wt, dval);
icmLab2XYZ(&icmD50, xyz_wt, lab_wt);
icmAry2XYZ(XYZ_WT, xyz_wt);
/* Create the XYZ chromatic transform from relative to absolute and back */
icmChromAdaptMatrix(ICM_CAM_BRADFORD, XYZ_WT, icmD50, toAbs);
icmChromAdaptMatrix(ICM_CAM_BRADFORD, icmD50, XYZ_WT, fromAbs);
/* Discover the Lab of the CMY black and CMYK black */
for (j = 0; j < 3; j++)
dval[j] = 0.0;
dval[j] = 1.0;
luo->lookup(luo, k_bk, dval);
visect(luo, cmyk_bk, NULL, wt, k_bk);
if (verb)
printf("K black %f %f %f, CMYK black %f %f %f\n", k_bk[0], k_bk[1], k_bk[2], cmyk_bk[0], cmyk_bk[1], cmyk_bk[2]);
/* Scale the CMY values that will be influenced by the K component to a darker */
/* black. */
for (i = 0; i < fxno; i++) {
/* Treat grey axis points differently */
if (fxlist[i].p[0] != 0.0
&& fxlist[i].p[0] == fxlist[i].p[1]
&& fxlist[i].p[0] == fxlist[i].p[2]) {
double xyz[3]; /* Temporary */
double lab[3]; /* Temporary */
//printf("~1 scaled neutral L value from %f",fxlist[i].v[0]);
/* Scale L value from K to CMYK black */
fxlist[i].v[0] = lab_wt[0] + (fxlist[i].v[0] - lab_wt[0]) *
(cmyk_bk[0] - lab_wt[0])/(k_bk[0] - lab_wt[0]);
//printf(" to %f\n",fxlist[i].v[0]);
#ifdef NEVER
/* Make a & b values same as CMYK black */
/* Pivot around white point */
fxlist[i].v[1] = wt[1] + (cmyk_bk[1] - wt[1]) *
(fxlist[i].v[0] - wt[0])/(cmyk_bk[0] - wt[0]);
fxlist[i].v[2] = wt[2] + (cmyk_bk[2] - wt[2]) *
(fxlist[i].v[0] - wt[0])/(cmyk_bk[0] - wt[0]);
#else
/* Convert absolute target Lab to relative Lab */
icmLab2XYZ(&icmD50, xyz, fxlist[i].v);
icmMulBy3x3(xyz, fromAbs, xyz);
icmXYZ2Lab(&icmD50, lab, xyz);
/* Make sure the equivalent relative value is neutral */
lab[1] = lab[2] = 0.0;
/* Convert back to absolute Lab */
icmLab2XYZ(&icmD50, xyz, lab);
icmMulBy3x3(xyz, toAbs, xyz);
icmXYZ2Lab(&icmD50, lab, xyz);
//printf("~1 corrected neutral value from Lab %f %f %f to %f %f %f\n", fxlist[i].v[0], fxlist[i].v[1], fxlist[i].v[2], lab[0], lab[1], lab[2]);
for (j = 0; j < 3; j++)
fxlist[i].v[j] = lab[j];
#endif
} else {
for (j = 0; j < 3; j++) {
if (fxlist[i].p[j] == 0.0)
break; /* Not a dark color */
}
if (j >= 3) {
/* Scale by CMYK/K black vector */
for (j = 0; j < 3; j++) {
fxlist[i].v[j] = lab_wt[j] + (fxlist[i].v[j] - lab_wt[j]) *
(cmyk_bk[j] - lab_wt[j])/(k_bk[j] - lab_wt[j]);
}
}
//printf("[%4.2f %4.2f %4.2f] %f %f %f becomes",
//fxlist[i].p[0], fxlist[i].p[1], fxlist[i].p[2], fxlist[i].v[0], fxlist[i].v[1], fxlist[i].v[2]);
/* Now clip non-neutrals to the gamut surface */
visect(luo, fxlist[i].v, NULL, ac, fxlist[i].v);
//printf("%f %f %f\n", fxlist[i].v[0], fxlist[i].v[1], fxlist[i].v[2]);
}
}
}
if (verb) {
for (i = 0; i < fxno; i++) {
if (dorgb) {
printf("Point %d = %f %f %f -> %f %f %f\n",i,
1.0 - fxlist[i].p[0], 1.0 - fxlist[i].p[1], 1.0 - fxlist[i].p[2],
fxlist[i].v[0], fxlist[i].v[1], fxlist[i].v[2]);
} else {
printf("Point %d = %f %f %f -> %f %f %f\n",i,
fxlist[i].p[0], fxlist[i].p[1], fxlist[i].p[2],
fxlist[i].v[0], fxlist[i].v[1], fxlist[i].v[2]);
}
}
}
/* Setup output cgats file */
{
char buf[1000];
cgats_set_elem *setel; /* Array of set value elements */
ocg = new_cgats(); /* Create a CGATS structure */
ocg->add_other(ocg, "CTI3"); /* our special type is Calibration Target Information 3 */
ocg->add_table(ocg, tt_other, 0); /* Start the first table */
ocg->add_kword(ocg, 0, "DESCRIPTOR", "Argyll Calibration Target chart information 3",NULL);
if (dorgb)
ocg->add_kword(ocg, 0, NULL, NULL, "Fake RGB device data for profile or RGB->CMYK link");
else
ocg->add_kword(ocg, 0, NULL, NULL, "Fake CMY device data for profile or CMY->CMYK link");
ocg->add_kword(ocg, 0, "ORIGINATOR", "Argyll fakeCMY", NULL);
atm[strlen(atm)-1] = '\000'; /* Remove \n from end */
ocg->add_kword(ocg, 0, "CREATED",atm, NULL);
ocg->add_kword(ocg, 0, "DEVICE_CLASS","OUTPUT", NULL);
if (dorgb)
ocg->add_kword(ocg, 0, "COLOR_REP","RGB_LAB", NULL);
else
ocg->add_kword(ocg, 0, "COLOR_REP","CMY_LAB", NULL);
if (!dorgb) {
if (tlimit >= 0) {
sprintf(buf,"%.0f",tlimit * 100.0);
ocg->add_kword(ocg, 0, "TOTAL_INK_LIMIT",buf, NULL);
}
if (klimit >= 0) {
sprintf(buf,"%.0f",klimit * 100.0);
ocg->add_kword(ocg, 0, "BLACK_INK_LIMIT",buf, NULL);
}
}
/* Fields we want */
ocg->add_field(ocg, 0, "SAMPLE_ID", nqcs_t);
if (dorgb) {
ocg->add_field(ocg, 0, "RGB_R", r_t);
ocg->add_field(ocg, 0, "RGB_G", r_t);
ocg->add_field(ocg, 0, "RGB_B", r_t);
} else {
ocg->add_field(ocg, 0, "CMY_C", r_t);
ocg->add_field(ocg, 0, "CMY_M", r_t);
ocg->add_field(ocg, 0, "CMY_Y", r_t);
}
ocg->add_field(ocg, 0, "LAB_L", r_t);
ocg->add_field(ocg, 0, "LAB_A", r_t);
ocg->add_field(ocg, 0, "LAB_B", r_t);
if ((setel = (cgats_set_elem *)malloc(sizeof(cgats_set_elem) * 7)) == NULL)
error("Malloc failed!");
/* Write out test values. */
for (i = 0; i < fxno; i++) {
sprintf(buf, "%d", i+1);
setel[0].c = buf;
if (dorgb) {
setel[1].d = 100.0 * (1.0 - fxlist[i].p[0]);
setel[2].d = 100.0 * (1.0 - fxlist[i].p[1]);
setel[3].d = 100.0 * (1.0 - fxlist[i].p[2]);
} else {
setel[1].d = 100.0 * fxlist[i].p[0];
setel[2].d = 100.0 * fxlist[i].p[1];
setel[3].d = 100.0 * fxlist[i].p[2];
}
setel[4].d = fxlist[i].v[0];
setel[5].d = fxlist[i].v[1];
setel[6].d = fxlist[i].v[2];
ocg->add_setarr(ocg, 0, setel);
}
free(setel);
if (ocg->write_name(ocg, out_name))
error("Write error : %s",ocg->e.m);
ocg->del(ocg);
}
luo->del(luo);
xicco->del(xicco);
rd_icco->del(rd_icco);
rd_fp->del(rd_fp);
return 0;
}
Reference in New Issue View Git Blame Copy Permalink