1//--------------------------------------------------------------------------------- 2// 3// Little Color Management System 4// Copyright (c) 1998-2010 Marti Maria Saguer 5// 6// Permission is hereby granted, free of charge, to any person obtaining 7// a copy of this software and associated documentation files (the "Software"), 8// to deal in the Software without restriction, including without limitation 9// the rights to use, copy, modify, merge, publish, distribute, sublicense, 10// and/or sell copies of the Software, and to permit persons to whom the Software 11// is furnished to do so, subject to the following conditions: 12// 13// The above copyright notice and this permission notice shall be included in 14// all copies or substantial portions of the Software. 15// 16// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 18// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23// 24//--------------------------------------------------------------------------------- 25// 26 27#include "lcms2_internal.h" 28 29// inter PCS conversions XYZ <-> CIE L* a* b* 30/* 31 32 33 CIE 15:2004 CIELab is defined as: 34 35 L* = 116*f(Y/Yn) - 16 0 <= L* <= 100 36 a* = 500*[f(X/Xn) - f(Y/Yn)] 37 b* = 200*[f(Y/Yn) - f(Z/Zn)] 38 39 and 40 41 f(t) = t^(1/3) 1 >= t > (24/116)^3 42 (841/108)*t + (16/116) 0 <= t <= (24/116)^3 43 44 45 Reverse transform is: 46 47 X = Xn*[a* / 500 + (L* + 16) / 116] ^ 3 if (X/Xn) > (24/116) 48 = Xn*(a* / 500 + L* / 116) / 7.787 if (X/Xn) <= (24/116) 49 50 51 52 PCS in Lab2 is encoded as: 53 54 8 bit Lab PCS: 55 56 L* 0..100 into a 0..ff byte. 57 a* t + 128 range is -128.0 +127.0 58 b* 59 60 16 bit Lab PCS: 61 62 L* 0..100 into a 0..ff00 word. 63 a* t + 128 range is -128.0 +127.9961 64 b* 65 66 67 68Interchange Space Component Actual Range Encoded Range 69CIE XYZ X 0 -> 1.99997 0x0000 -> 0xffff 70CIE XYZ Y 0 -> 1.99997 0x0000 -> 0xffff 71CIE XYZ Z 0 -> 1.99997 0x0000 -> 0xffff 72 73Version 2,3 74----------- 75 76CIELAB (16 bit) L* 0 -> 100.0 0x0000 -> 0xff00 77CIELAB (16 bit) a* -128.0 -> +127.996 0x0000 -> 0x8000 -> 0xffff 78CIELAB (16 bit) b* -128.0 -> +127.996 0x0000 -> 0x8000 -> 0xffff 79 80 81Version 4 82--------- 83 84CIELAB (16 bit) L* 0 -> 100.0 0x0000 -> 0xffff 85CIELAB (16 bit) a* -128.0 -> +127 0x0000 -> 0x8080 -> 0xffff 86CIELAB (16 bit) b* -128.0 -> +127 0x0000 -> 0x8080 -> 0xffff 87 88*/ 89 90// Conversions 91void CMSEXPORT cmsXYZ2xyY(cmsCIExyY* Dest, const cmsCIEXYZ* Source) 92{ 93 cmsFloat64Number ISum; 94 95 ISum = 1./(Source -> X + Source -> Y + Source -> Z); 96 97 Dest -> x = (Source -> X) * ISum; 98 Dest -> y = (Source -> Y) * ISum; 99 Dest -> Y = Source -> Y; 100} 101 102void CMSEXPORT cmsxyY2XYZ(cmsCIEXYZ* Dest, const cmsCIExyY* Source) 103{ 104 Dest -> X = (Source -> x / Source -> y) * Source -> Y; 105 Dest -> Y = Source -> Y; 106 Dest -> Z = ((1 - Source -> x - Source -> y) / Source -> y) * Source -> Y; 107} 108 109static 110cmsFloat64Number f(cmsFloat64Number t) 111{ 112 const cmsFloat64Number Limit = (24.0/116.0) * (24.0/116.0) * (24.0/116.0); 113 114 if (t <= Limit) 115 return (841.0/108.0) * t + (16.0/116.0); 116 else 117 return pow(t, 1.0/3.0); 118} 119 120static 121cmsFloat64Number f_1(cmsFloat64Number t) 122{ 123 const cmsFloat64Number Limit = (24.0/116.0); 124 125 if (t <= Limit) { 126 return (108.0/841.0) * (t - (16.0/116.0)); 127 } 128 129 return t * t * t; 130} 131 132 133// Standard XYZ to Lab. it can handle negative XZY numbers in some cases 134void CMSEXPORT cmsXYZ2Lab(const cmsCIEXYZ* WhitePoint, cmsCIELab* Lab, const cmsCIEXYZ* xyz) 135{ 136 cmsFloat64Number fx, fy, fz; 137 138 if (WhitePoint == NULL) 139 WhitePoint = cmsD50_XYZ(); 140 141 fx = f(xyz->X / WhitePoint->X); 142 fy = f(xyz->Y / WhitePoint->Y); 143 fz = f(xyz->Z / WhitePoint->Z); 144 145 Lab->L = 116.0*fy - 16.0; 146 Lab->a = 500.0*(fx - fy); 147 Lab->b = 200.0*(fy - fz); 148} 149 150 151// Standard XYZ to Lab. It can return negative XYZ in some cases 152void CMSEXPORT cmsLab2XYZ(const cmsCIEXYZ* WhitePoint, cmsCIEXYZ* xyz, const cmsCIELab* Lab) 153{ 154 cmsFloat64Number x, y, z; 155 156 if (WhitePoint == NULL) 157 WhitePoint = cmsD50_XYZ(); 158 159 y = (Lab-> L + 16.0) / 116.0; 160 x = y + 0.002 * Lab -> a; 161 z = y - 0.005 * Lab -> b; 162 163 xyz -> X = f_1(x) * WhitePoint -> X; 164 xyz -> Y = f_1(y) * WhitePoint -> Y; 165 xyz -> Z = f_1(z) * WhitePoint -> Z; 166 167} 168 169static 170cmsFloat64Number L2float2(cmsUInt16Number v) 171{ 172 return (cmsFloat64Number) v / 652.800; 173} 174 175// the a/b part 176static 177cmsFloat64Number ab2float2(cmsUInt16Number v) 178{ 179 return ((cmsFloat64Number) v / 256.0) - 128.0; 180} 181 182static 183cmsUInt16Number L2Fix2(cmsFloat64Number L) 184{ 185 return _cmsQuickSaturateWord(L * 652.8); 186} 187 188static 189cmsUInt16Number ab2Fix2(cmsFloat64Number ab) 190{ 191 return _cmsQuickSaturateWord((ab + 128.0) * 256.0); 192} 193 194 195static 196cmsFloat64Number L2float4(cmsUInt16Number v) 197{ 198 return (cmsFloat64Number) v / 655.35; 199} 200 201// the a/b part 202static 203cmsFloat64Number ab2float4(cmsUInt16Number v) 204{ 205 return ((cmsFloat64Number) v / 257.0) - 128.0; 206} 207 208 209void CMSEXPORT cmsLabEncoded2FloatV2(cmsCIELab* Lab, const cmsUInt16Number wLab[3]) 210{ 211 Lab->L = L2float2(wLab[0]); 212 Lab->a = ab2float2(wLab[1]); 213 Lab->b = ab2float2(wLab[2]); 214} 215 216 217void CMSEXPORT cmsLabEncoded2Float(cmsCIELab* Lab, const cmsUInt16Number wLab[3]) 218{ 219 Lab->L = L2float4(wLab[0]); 220 Lab->a = ab2float4(wLab[1]); 221 Lab->b = ab2float4(wLab[2]); 222} 223 224static 225cmsFloat64Number Clamp_L_doubleV2(cmsFloat64Number L) 226{ 227 const cmsFloat64Number L_max = (cmsFloat64Number) (0xFFFF * 100.0) / 0xFF00; 228 229 if (L < 0) L = 0; 230 if (L > L_max) L = L_max; 231 232 return L; 233} 234 235 236static 237cmsFloat64Number Clamp_ab_doubleV2(cmsFloat64Number ab) 238{ 239 if (ab < MIN_ENCODEABLE_ab2) ab = MIN_ENCODEABLE_ab2; 240 if (ab > MAX_ENCODEABLE_ab2) ab = MAX_ENCODEABLE_ab2; 241 242 return ab; 243} 244 245void CMSEXPORT cmsFloat2LabEncodedV2(cmsUInt16Number wLab[3], const cmsCIELab* fLab) 246{ 247 cmsCIELab Lab; 248 249 Lab.L = Clamp_L_doubleV2(fLab ->L); 250 Lab.a = Clamp_ab_doubleV2(fLab ->a); 251 Lab.b = Clamp_ab_doubleV2(fLab ->b); 252 253 wLab[0] = L2Fix2(Lab.L); 254 wLab[1] = ab2Fix2(Lab.a); 255 wLab[2] = ab2Fix2(Lab.b); 256} 257 258 259static 260cmsFloat64Number Clamp_L_doubleV4(cmsFloat64Number L) 261{ 262 if (L < 0) L = 0; 263 if (L > 100.0) L = 100.0; 264 265 return L; 266} 267 268static 269cmsFloat64Number Clamp_ab_doubleV4(cmsFloat64Number ab) 270{ 271 if (ab < MIN_ENCODEABLE_ab4) ab = MIN_ENCODEABLE_ab4; 272 if (ab > MAX_ENCODEABLE_ab4) ab = MAX_ENCODEABLE_ab4; 273 274 return ab; 275} 276 277static 278cmsUInt16Number L2Fix4(cmsFloat64Number L) 279{ 280 return _cmsQuickSaturateWord(L * 655.35); 281} 282 283static 284cmsUInt16Number ab2Fix4(cmsFloat64Number ab) 285{ 286 return _cmsQuickSaturateWord((ab + 128.0) * 257.0); 287} 288 289void CMSEXPORT cmsFloat2LabEncoded(cmsUInt16Number wLab[3], const cmsCIELab* fLab) 290{ 291 cmsCIELab Lab; 292 293 Lab.L = Clamp_L_doubleV4(fLab ->L); 294 Lab.a = Clamp_ab_doubleV4(fLab ->a); 295 Lab.b = Clamp_ab_doubleV4(fLab ->b); 296 297 wLab[0] = L2Fix4(Lab.L); 298 wLab[1] = ab2Fix4(Lab.a); 299 wLab[2] = ab2Fix4(Lab.b); 300} 301 302// Auxiliar: convert to Radians 303static 304cmsFloat64Number RADIANS(cmsFloat64Number deg) 305{ 306 return (deg * M_PI) / 180.; 307} 308 309 310// Auxiliar: atan2 but operating in degrees and returning 0 if a==b==0 311static 312cmsFloat64Number atan2deg(cmsFloat64Number a, cmsFloat64Number b) 313{ 314 cmsFloat64Number h; 315 316 if (a == 0 && b == 0) 317 h = 0; 318 else 319 h = atan2(a, b); 320 321 h *= (180. / M_PI); 322 323 while (h > 360.) 324 h -= 360.; 325 326 while ( h < 0) 327 h += 360.; 328 329 return h; 330} 331 332 333// Auxiliar: Square 334static 335cmsFloat64Number Sqr(cmsFloat64Number v) 336{ 337 return v * v; 338} 339// From cylindrical coordinates. No check is performed, then negative values are allowed 340void CMSEXPORT cmsLab2LCh(cmsCIELCh* LCh, const cmsCIELab* Lab) 341{ 342 LCh -> L = Lab -> L; 343 LCh -> C = pow(Sqr(Lab ->a) + Sqr(Lab ->b), 0.5); 344 LCh -> h = atan2deg(Lab ->b, Lab ->a); 345} 346 347 348// To cylindrical coordinates. No check is performed, then negative values are allowed 349void CMSEXPORT cmsLCh2Lab(cmsCIELab* Lab, const cmsCIELCh* LCh) 350{ 351 cmsFloat64Number h = (LCh -> h * M_PI) / 180.0; 352 353 Lab -> L = LCh -> L; 354 Lab -> a = LCh -> C * cos(h); 355 Lab -> b = LCh -> C * sin(h); 356} 357 358// In XYZ All 3 components are encoded using 1.15 fixed point 359static 360cmsUInt16Number XYZ2Fix(cmsFloat64Number d) 361{ 362 return _cmsQuickSaturateWord(d * 32768.0); 363} 364 365void CMSEXPORT cmsFloat2XYZEncoded(cmsUInt16Number XYZ[3], const cmsCIEXYZ* fXYZ) 366{ 367 cmsCIEXYZ xyz; 368 369 xyz.X = fXYZ -> X; 370 xyz.Y = fXYZ -> Y; 371 xyz.Z = fXYZ -> Z; 372 373 // Clamp to encodeable values. 374 if (xyz.Y <= 0) { 375 376 xyz.X = 0; 377 xyz.Y = 0; 378 xyz.Z = 0; 379 } 380 381 if (xyz.X > MAX_ENCODEABLE_XYZ) 382 xyz.X = MAX_ENCODEABLE_XYZ; 383 384 if (xyz.X < 0) 385 xyz.X = 0; 386 387 if (xyz.Y > MAX_ENCODEABLE_XYZ) 388 xyz.Y = MAX_ENCODEABLE_XYZ; 389 390 if (xyz.Y < 0) 391 xyz.Y = 0; 392 393 if (xyz.Z > MAX_ENCODEABLE_XYZ) 394 xyz.Z = MAX_ENCODEABLE_XYZ; 395 396 if (xyz.Z < 0) 397 xyz.Z = 0; 398 399 400 XYZ[0] = XYZ2Fix(xyz.X); 401 XYZ[1] = XYZ2Fix(xyz.Y); 402 XYZ[2] = XYZ2Fix(xyz.Z); 403} 404 405 406// To convert from Fixed 1.15 point to cmsFloat64Number 407static 408cmsFloat64Number XYZ2float(cmsUInt16Number v) 409{ 410 cmsS15Fixed16Number fix32; 411 412 // From 1.15 to 15.16 413 fix32 = v << 1; 414 415 // From fixed 15.16 to cmsFloat64Number 416 return _cms15Fixed16toDouble(fix32); 417} 418 419 420void CMSEXPORT cmsXYZEncoded2Float(cmsCIEXYZ* fXYZ, const cmsUInt16Number XYZ[3]) 421{ 422 fXYZ -> X = XYZ2float(XYZ[0]); 423 fXYZ -> Y = XYZ2float(XYZ[1]); 424 fXYZ -> Z = XYZ2float(XYZ[2]); 425} 426 427 428// Returns dE on two Lab values 429cmsFloat64Number CMSEXPORT cmsDeltaE(const cmsCIELab* Lab1, const cmsCIELab* Lab2) 430{ 431 cmsFloat64Number dL, da, db; 432 433 dL = fabs(Lab1 -> L - Lab2 -> L); 434 da = fabs(Lab1 -> a - Lab2 -> a); 435 db = fabs(Lab1 -> b - Lab2 -> b); 436 437 return pow(Sqr(dL) + Sqr(da) + Sqr(db), 0.5); 438} 439 440 441// Return the CIE94 Delta E 442cmsFloat64Number CMSEXPORT cmsCIE94DeltaE(const cmsCIELab* Lab1, const cmsCIELab* Lab2) 443{ 444 cmsCIELCh LCh1, LCh2; 445 cmsFloat64Number dE, dL, dC, dh, dhsq; 446 cmsFloat64Number c12, sc, sh; 447 448 dL = fabs(Lab1 ->L - Lab2 ->L); 449 450 cmsLab2LCh(&LCh1, Lab1); 451 cmsLab2LCh(&LCh2, Lab2); 452 453 dC = fabs(LCh1.C - LCh2.C); 454 dE = cmsDeltaE(Lab1, Lab2); 455 456 dhsq = Sqr(dE) - Sqr(dL) - Sqr(dC); 457 if (dhsq < 0) 458 dh = 0; 459 else 460 dh = pow(dhsq, 0.5); 461 462 c12 = sqrt(LCh1.C * LCh2.C); 463 464 sc = 1.0 + (0.048 * c12); 465 sh = 1.0 + (0.014 * c12); 466 467 return sqrt(Sqr(dL) + Sqr(dC) / Sqr(sc) + Sqr(dh) / Sqr(sh)); 468} 469 470 471// Auxiliary 472static 473cmsFloat64Number ComputeLBFD(const cmsCIELab* Lab) 474{ 475 cmsFloat64Number yt; 476 477 if (Lab->L > 7.996969) 478 yt = (Sqr((Lab->L+16)/116)*((Lab->L+16)/116))*100; 479 else 480 yt = 100 * (Lab->L / 903.3); 481 482 return (54.6 * (M_LOG10E * (log(yt + 1.5))) - 9.6); 483} 484 485 486 487// bfd - gets BFD(1:1) difference between Lab1, Lab2 488cmsFloat64Number CMSEXPORT cmsBFDdeltaE(const cmsCIELab* Lab1, const cmsCIELab* Lab2) 489{ 490 cmsFloat64Number lbfd1,lbfd2,AveC,Aveh,dE,deltaL, 491 deltaC,deltah,dc,t,g,dh,rh,rc,rt,bfd; 492 cmsCIELCh LCh1, LCh2; 493 494 495 lbfd1 = ComputeLBFD(Lab1); 496 lbfd2 = ComputeLBFD(Lab2); 497 deltaL = lbfd2 - lbfd1; 498 499 cmsLab2LCh(&LCh1, Lab1); 500 cmsLab2LCh(&LCh2, Lab2); 501 502 deltaC = LCh2.C - LCh1.C; 503 AveC = (LCh1.C+LCh2.C)/2; 504 Aveh = (LCh1.h+LCh2.h)/2; 505 506 dE = cmsDeltaE(Lab1, Lab2); 507 508 if (Sqr(dE)>(Sqr(Lab2->L-Lab1->L)+Sqr(deltaC))) 509 deltah = sqrt(Sqr(dE)-Sqr(Lab2->L-Lab1->L)-Sqr(deltaC)); 510 else 511 deltah =0; 512 513 514 dc = 0.035 * AveC / (1 + 0.00365 * AveC)+0.521; 515 g = sqrt(Sqr(Sqr(AveC))/(Sqr(Sqr(AveC))+14000)); 516 t = 0.627+(0.055*cos((Aveh-254)/(180/M_PI))- 517 0.040*cos((2*Aveh-136)/(180/M_PI))+ 518 0.070*cos((3*Aveh-31)/(180/M_PI))+ 519 0.049*cos((4*Aveh+114)/(180/M_PI))- 520 0.015*cos((5*Aveh-103)/(180/M_PI))); 521 522 dh = dc*(g*t+1-g); 523 rh = -0.260*cos((Aveh-308)/(180/M_PI))- 524 0.379*cos((2*Aveh-160)/(180/M_PI))- 525 0.636*cos((3*Aveh+254)/(180/M_PI))+ 526 0.226*cos((4*Aveh+140)/(180/M_PI))- 527 0.194*cos((5*Aveh+280)/(180/M_PI)); 528 529 rc = sqrt((AveC*AveC*AveC*AveC*AveC*AveC)/((AveC*AveC*AveC*AveC*AveC*AveC)+70000000)); 530 rt = rh*rc; 531 532 bfd = sqrt(Sqr(deltaL)+Sqr(deltaC/dc)+Sqr(deltah/dh)+(rt*(deltaC/dc)*(deltah/dh))); 533 534 return bfd; 535} 536 537 538// cmc - CMC(l:c) difference between Lab1, Lab2 539cmsFloat64Number CMSEXPORT cmsCMCdeltaE(const cmsCIELab* Lab1, const cmsCIELab* Lab2, cmsFloat64Number l, cmsFloat64Number c) 540{ 541 cmsFloat64Number dE,dL,dC,dh,sl,sc,sh,t,f,cmc; 542 cmsCIELCh LCh1, LCh2; 543 544 if (Lab1 ->L == 0 && Lab2 ->L == 0) return 0; 545 546 cmsLab2LCh(&LCh1, Lab1); 547 cmsLab2LCh(&LCh2, Lab2); 548 549 550 dL = Lab2->L-Lab1->L; 551 dC = LCh2.C-LCh1.C; 552 553 dE = cmsDeltaE(Lab1, Lab2); 554 555 if (Sqr(dE)>(Sqr(dL)+Sqr(dC))) 556 dh = sqrt(Sqr(dE)-Sqr(dL)-Sqr(dC)); 557 else 558 dh =0; 559 560 if ((LCh1.h > 164) && (LCh1.h < 345)) 561 t = 0.56 + fabs(0.2 * cos(((LCh1.h + 168)/(180/M_PI)))); 562 else 563 t = 0.36 + fabs(0.4 * cos(((LCh1.h + 35 )/(180/M_PI)))); 564 565 sc = 0.0638 * LCh1.C / (1 + 0.0131 * LCh1.C) + 0.638; 566 sl = 0.040975 * Lab1->L /(1 + 0.01765 * Lab1->L); 567 568 if (Lab1->L<16) 569 sl = 0.511; 570 571 f = sqrt((LCh1.C * LCh1.C * LCh1.C * LCh1.C)/((LCh1.C * LCh1.C * LCh1.C * LCh1.C)+1900)); 572 sh = sc*(t*f+1-f); 573 cmc = sqrt(Sqr(dL/(l*sl))+Sqr(dC/(c*sc))+Sqr(dh/sh)); 574 575 return cmc; 576} 577 578// dE2000 The weightings KL, KC and KH can be modified to reflect the relative 579// importance of lightness, chroma and hue in different industrial applications 580cmsFloat64Number CMSEXPORT cmsCIE2000DeltaE(const cmsCIELab* Lab1, const cmsCIELab* Lab2, 581 cmsFloat64Number Kl, cmsFloat64Number Kc, cmsFloat64Number Kh) 582{ 583 cmsFloat64Number L1 = Lab1->L; 584 cmsFloat64Number a1 = Lab1->a; 585 cmsFloat64Number b1 = Lab1->b; 586 cmsFloat64Number C = sqrt( Sqr(a1) + Sqr(b1) ); 587 588 cmsFloat64Number Ls = Lab2 ->L; 589 cmsFloat64Number as = Lab2 ->a; 590 cmsFloat64Number bs = Lab2 ->b; 591 cmsFloat64Number Cs = sqrt( Sqr(as) + Sqr(bs) ); 592 593 cmsFloat64Number G = 0.5 * ( 1 - sqrt(pow((C + Cs) / 2 , 7.0) / (pow((C + Cs) / 2, 7.0) + pow(25.0, 7.0) ) )); 594 595 cmsFloat64Number a_p = (1 + G ) * a1; 596 cmsFloat64Number b_p = b1; 597 cmsFloat64Number C_p = sqrt( Sqr(a_p) + Sqr(b_p)); 598 cmsFloat64Number h_p = atan2deg(b_p, a_p); 599 600 601 cmsFloat64Number a_ps = (1 + G) * as; 602 cmsFloat64Number b_ps = bs; 603 cmsFloat64Number C_ps = sqrt(Sqr(a_ps) + Sqr(b_ps)); 604 cmsFloat64Number h_ps = atan2deg(b_ps, a_ps); 605 606 cmsFloat64Number meanC_p =(C_p + C_ps) / 2; 607 608 cmsFloat64Number hps_plus_hp = h_ps + h_p; 609 cmsFloat64Number hps_minus_hp = h_ps - h_p; 610 611 cmsFloat64Number meanh_p = fabs(hps_minus_hp) <= 180.000001 ? (hps_plus_hp)/2 : 612 (hps_plus_hp) < 360 ? (hps_plus_hp + 360)/2 : 613 (hps_plus_hp - 360)/2; 614 615 cmsFloat64Number delta_h = (hps_minus_hp) <= -180.000001 ? (hps_minus_hp + 360) : 616 (hps_minus_hp) > 180 ? (hps_minus_hp - 360) : 617 (hps_minus_hp); 618 cmsFloat64Number delta_L = (Ls - L1); 619 cmsFloat64Number delta_C = (C_ps - C_p ); 620 621 622 cmsFloat64Number delta_H =2 * sqrt(C_ps*C_p) * sin(RADIANS(delta_h) / 2); 623 624 cmsFloat64Number T = 1 - 0.17 * cos(RADIANS(meanh_p-30)) 625 + 0.24 * cos(RADIANS(2*meanh_p)) 626 + 0.32 * cos(RADIANS(3*meanh_p + 6)) 627 - 0.2 * cos(RADIANS(4*meanh_p - 63)); 628 629 cmsFloat64Number Sl = 1 + (0.015 * Sqr((Ls + L1) /2- 50) )/ sqrt(20 + Sqr( (Ls+L1)/2 - 50) ); 630 631 cmsFloat64Number Sc = 1 + 0.045 * (C_p + C_ps)/2; 632 cmsFloat64Number Sh = 1 + 0.015 * ((C_ps + C_p)/2) * T; 633 634 cmsFloat64Number delta_ro = 30 * exp( -Sqr(((meanh_p - 275 ) / 25))); 635 636 cmsFloat64Number Rc = 2 * sqrt(( pow(meanC_p, 7.0) )/( pow(meanC_p, 7.0) + pow(25.0, 7.0))); 637 638 cmsFloat64Number Rt = -sin(2 * RADIANS(delta_ro)) * Rc; 639 640 cmsFloat64Number deltaE00 = sqrt( Sqr(delta_L /(Sl * Kl)) + 641 Sqr(delta_C/(Sc * Kc)) + 642 Sqr(delta_H/(Sh * Kh)) + 643 Rt*(delta_C/(Sc * Kc)) * (delta_H / (Sh * Kh))); 644 645 return deltaE00; 646} 647 648// This function returns a number of gridpoints to be used as LUT table. It assumes same number 649// of gripdpoints in all dimensions. Flags may override the choice. 650int _cmsReasonableGridpointsByColorspace(cmsColorSpaceSignature Colorspace, cmsUInt32Number dwFlags) 651{ 652 int nChannels; 653 654 // Already specified? 655 if (dwFlags & 0x00FF0000) { 656 // Yes, grab'em 657 return (dwFlags >> 16) & 0xFF; 658 } 659 660 nChannels = cmsChannelsOf(Colorspace); 661 662 // HighResPrecalc is maximum resolution 663 if (dwFlags & cmsFLAGS_HIGHRESPRECALC) { 664 665 if (nChannels > 4) 666 return 7; // 7 for Hifi 667 668 if (nChannels == 4) // 23 for CMYK 669 return 23; 670 671 return 49; // 49 for RGB and others 672 } 673 674 675 // LowResPrecal is lower resolution 676 if (dwFlags & cmsFLAGS_LOWRESPRECALC) { 677 678 if (nChannels > 4) 679 return 6; // 6 for more than 4 channels 680 681 if (nChannels == 1) 682 return 33; // For monochrome 683 684 return 17; // 17 for remaining 685 } 686 687 // Default values 688 if (nChannels > 4) 689 return 7; // 7 for Hifi 690 691 if (nChannels == 4) 692 return 17; // 17 for CMYK 693 694 return 33; // 33 for RGB 695} 696 697 698cmsBool _cmsEndPointsBySpace(cmsColorSpaceSignature Space, 699 cmsUInt16Number **White, 700 cmsUInt16Number **Black, 701 cmsUInt32Number *nOutputs) 702{ 703 // Only most common spaces 704 705 static cmsUInt16Number RGBblack[4] = { 0, 0, 0 }; 706 static cmsUInt16Number RGBwhite[4] = { 0xffff, 0xffff, 0xffff }; 707 static cmsUInt16Number CMYKblack[4] = { 0xffff, 0xffff, 0xffff, 0xffff }; // 400% of ink 708 static cmsUInt16Number CMYKwhite[4] = { 0, 0, 0, 0 }; 709 static cmsUInt16Number LABblack[4] = { 0, 0x8080, 0x8080 }; // V4 Lab encoding 710 static cmsUInt16Number LABwhite[4] = { 0xFFFF, 0x8080, 0x8080 }; 711 static cmsUInt16Number CMYblack[4] = { 0xffff, 0xffff, 0xffff }; 712 static cmsUInt16Number CMYwhite[4] = { 0, 0, 0 }; 713 static cmsUInt16Number Grayblack[4] = { 0 }; 714 static cmsUInt16Number GrayWhite[4] = { 0xffff }; 715 716 switch (Space) { 717 718 case cmsSigGrayData: if (White) *White = GrayWhite; 719 if (Black) *Black = Grayblack; 720 if (nOutputs) *nOutputs = 1; 721 return TRUE; 722 723 case cmsSigRgbData: if (White) *White = RGBwhite; 724 if (Black) *Black = RGBblack; 725 if (nOutputs) *nOutputs = 3; 726 return TRUE; 727 728 case cmsSigLabData: if (White) *White = LABwhite; 729 if (Black) *Black = LABblack; 730 if (nOutputs) *nOutputs = 3; 731 return TRUE; 732 733 case cmsSigCmykData: if (White) *White = CMYKwhite; 734 if (Black) *Black = CMYKblack; 735 if (nOutputs) *nOutputs = 4; 736 return TRUE; 737 738 case cmsSigCmyData: if (White) *White = CMYwhite; 739 if (Black) *Black = CMYblack; 740 if (nOutputs) *nOutputs = 3; 741 return TRUE; 742 743 default:; 744 } 745 746 return FALSE; 747} 748 749 750 751// Several utilities ------------------------------------------------------- 752 753// Translate from our colorspace to ICC representation 754 755cmsColorSpaceSignature CMSEXPORT _cmsICCcolorSpace(int OurNotation) 756{ 757 switch (OurNotation) { 758 759 case 1: 760 case PT_GRAY: return cmsSigGrayData; 761 762 case 2: 763 case PT_RGB: return cmsSigRgbData; 764 765 case PT_CMY: return cmsSigCmyData; 766 case PT_CMYK: return cmsSigCmykData; 767 case PT_YCbCr:return cmsSigYCbCrData; 768 case PT_YUV: return cmsSigLuvData; 769 case PT_XYZ: return cmsSigXYZData; 770 771 case PT_LabV2: 772 case PT_Lab: return cmsSigLabData; 773 774 case PT_YUVK: return cmsSigLuvKData; 775 case PT_HSV: return cmsSigHsvData; 776 case PT_HLS: return cmsSigHlsData; 777 case PT_Yxy: return cmsSigYxyData; 778 779 case PT_MCH1: return cmsSigMCH1Data; 780 case PT_MCH2: return cmsSigMCH2Data; 781 case PT_MCH3: return cmsSigMCH3Data; 782 case PT_MCH4: return cmsSigMCH4Data; 783 case PT_MCH5: return cmsSigMCH5Data; 784 case PT_MCH6: return cmsSigMCH6Data; 785 case PT_MCH7: return cmsSigMCH7Data; 786 case PT_MCH8: return cmsSigMCH8Data; 787 788 case PT_MCH9: return cmsSigMCH9Data; 789 case PT_MCH10: return cmsSigMCHAData; 790 case PT_MCH11: return cmsSigMCHBData; 791 case PT_MCH12: return cmsSigMCHCData; 792 case PT_MCH13: return cmsSigMCHDData; 793 case PT_MCH14: return cmsSigMCHEData; 794 case PT_MCH15: return cmsSigMCHFData; 795 796 default: return (cmsColorSpaceSignature) (-1); 797 } 798} 799 800 801int CMSEXPORT _cmsLCMScolorSpace(cmsColorSpaceSignature ProfileSpace) 802{ 803 switch (ProfileSpace) { 804 805 case cmsSigGrayData: return PT_GRAY; 806 case cmsSigRgbData: return PT_RGB; 807 case cmsSigCmyData: return PT_CMY; 808 case cmsSigCmykData: return PT_CMYK; 809 case cmsSigYCbCrData:return PT_YCbCr; 810 case cmsSigLuvData: return PT_YUV; 811 case cmsSigXYZData: return PT_XYZ; 812 case cmsSigLabData: return PT_Lab; 813 case cmsSigLuvKData: return PT_YUVK; 814 case cmsSigHsvData: return PT_HSV; 815 case cmsSigHlsData: return PT_HLS; 816 case cmsSigYxyData: return PT_Yxy; 817 818 case cmsSig1colorData: 819 case cmsSigMCH1Data: return PT_MCH1; 820 821 case cmsSig2colorData: 822 case cmsSigMCH2Data: return PT_MCH2; 823 824 case cmsSig3colorData: 825 case cmsSigMCH3Data: return PT_MCH3; 826 827 case cmsSig4colorData: 828 case cmsSigMCH4Data: return PT_MCH4; 829 830 case cmsSig5colorData: 831 case cmsSigMCH5Data: return PT_MCH5; 832 833 case cmsSig6colorData: 834 case cmsSigMCH6Data: return PT_MCH6; 835 836 case cmsSigMCH7Data: 837 case cmsSig7colorData:return PT_MCH7; 838 839 case cmsSigMCH8Data: 840 case cmsSig8colorData:return PT_MCH8; 841 842 case cmsSigMCH9Data: 843 case cmsSig9colorData:return PT_MCH9; 844 845 case cmsSigMCHAData: 846 case cmsSig10colorData:return PT_MCH10; 847 848 case cmsSigMCHBData: 849 case cmsSig11colorData:return PT_MCH11; 850 851 case cmsSigMCHCData: 852 case cmsSig12colorData:return PT_MCH12; 853 854 case cmsSigMCHDData: 855 case cmsSig13colorData:return PT_MCH13; 856 857 case cmsSigMCHEData: 858 case cmsSig14colorData:return PT_MCH14; 859 860 case cmsSigMCHFData: 861 case cmsSig15colorData:return PT_MCH15; 862 863 default: return (cmsColorSpaceSignature) (-1); 864 } 865} 866 867 868cmsUInt32Number CMSEXPORT cmsChannelsOf(cmsColorSpaceSignature ColorSpace) 869{ 870 switch (ColorSpace) { 871 872 case cmsSigMCH1Data: 873 case cmsSig1colorData: 874 case cmsSigGrayData: return 1; 875 876 case cmsSigMCH2Data: 877 case cmsSig2colorData: return 2; 878 879 case cmsSigXYZData: 880 case cmsSigLabData: 881 case cmsSigLuvData: 882 case cmsSigYCbCrData: 883 case cmsSigYxyData: 884 case cmsSigRgbData: 885 case cmsSigHsvData: 886 case cmsSigHlsData: 887 case cmsSigCmyData: 888 case cmsSigMCH3Data: 889 case cmsSig3colorData: return 3; 890 891 case cmsSigLuvKData: 892 case cmsSigCmykData: 893 case cmsSigMCH4Data: 894 case cmsSig4colorData: return 4; 895 896 case cmsSigMCH5Data: 897 case cmsSig5colorData: return 5; 898 899 case cmsSigMCH6Data: 900 case cmsSig6colorData: return 6; 901 902 case cmsSigMCH7Data: 903 case cmsSig7colorData: return 7; 904 905 case cmsSigMCH8Data: 906 case cmsSig8colorData: return 8; 907 908 case cmsSigMCH9Data: 909 case cmsSig9colorData: return 9; 910 911 case cmsSigMCHAData: 912 case cmsSig10colorData: return 10; 913 914 case cmsSigMCHBData: 915 case cmsSig11colorData: return 11; 916 917 case cmsSigMCHCData: 918 case cmsSig12colorData: return 12; 919 920 case cmsSigMCHDData: 921 case cmsSig13colorData: return 13; 922 923 case cmsSigMCHEData: 924 case cmsSig14colorData: return 14; 925 926 case cmsSigMCHFData: 927 case cmsSig15colorData: return 15; 928 929 default: return 3; 930 } 931} 932