Am 27.01.2011 04:54, schrieb Graeme Gill: > Possibly. It would be interesting to identify three points: two either > side of a discontinuity, and one right inside it, Using a profile created from Elena's ofps2.ti3 data I did take a closer look at a short line crossing one of the discontinuities (a straight line in the source sRGB space, which is then converted with perceptual intent to CMYK). And it seems to happen at a location where CMYK colorants are crossing very steeply. Note that the 101 CMYK points below spawn only a couple of dE in total! So possibly limiting the 1st derivatives may be a key to success? Regards, Gerhard CMYK: 147.589056 255.000000 211.444246 89.639688 147.449397 255.000000 210.761833 89.712065 147.308818 255.000000 210.074727 89.782636 147.170518 255.000000 209.391281 89.855917 147.034468 255.000000 208.700696 89.937364 146.901143 255.000000 208.023385 90.017281 146.765950 255.000000 207.336725 90.093578 146.627302 255.000000 206.645558 90.169091 146.489000 255.000000 205.962169 90.242415 146.353461 255.000000 205.280502 90.320620 146.215817 255.000000 204.597959 90.396720 146.081621 255.000000 203.968098 90.452620 145.949232 255.000000 203.354775 90.501377 145.810954 255.000000 202.670778 90.574248 145.672124 255.000000 201.972192 90.651061 145.531704 255.000000 201.290138 90.721289 145.391961 255.000000 200.610167 90.794034 144.182603 255.000000 199.057745 93.181536 142.836807 255.000000 197.390225 95.886130 141.479385 255.000000 195.713618 98.610302 140.123599 255.000000 194.036280 101.328329 138.768033 255.000000 192.360995 104.041099 137.419200 255.000000 190.699474 106.738508 135.991107 255.000000 189.001333 109.540815 133.657102 255.000000 186.854668 113.670524 131.345426 255.000000 184.735313 117.744530 129.055728 255.000000 182.633536 121.791799 126.781979 255.000000 180.531665 125.823717 124.525324 255.000000 178.442086 129.829509 122.211695 255.000000 176.320001 133.908049 119.917316 255.000000 174.210671 137.963117 117.609610 255.000000 172.087952 142.042274 115.306966 255.000000 169.975948 146.109491 113.026311 255.000000 167.872001 150.145138 110.838269 255.000000 165.896934 153.972360 108.629399 255.000000 163.923790 157.808097 106.319631 255.000000 161.810632 161.882351 103.999040 255.000000 159.688147 165.968016 101.689057 255.000000 157.569032 170.045755 99.382821 255.000000 155.461212 174.107905 97.126022 255.000000 153.371874 178.116895 94.910014 255.000000 151.320790 182.046916 93.548516 255.000000 149.655968 184.747269 92.316971 255.000000 148.170133 187.160532 91.677646 255.000000 147.076950 188.593787 92.242144 255.000000 146.631504 188.169886 92.716109 255.000000 146.242452 187.783530 93.298697 255.000000 145.777325 187.347602 93.778586 255.000000 145.384752 186.955806 94.367943 255.000000 144.911438 186.518649 94.952626 255.000000 144.444399 186.079403 95.539136 255.000000 143.975065 185.636496 96.119132 255.000000 143.549055 185.107810 96.655231 255.000000 143.263182 184.267993 97.193897 255.000000 142.973358 183.431315 97.732562 255.000000 142.683533 182.586854 98.320924 255.000000 142.365907 181.698598 98.922702 255.000000 142.045640 180.797356 99.459961 255.000000 141.757177 179.959140 100.054316 255.000000 141.439588 179.063712 100.709509 255.000000 141.091611 178.115308 101.293238 255.000000 140.780182 177.230329 101.911235 255.000000 140.453769 176.316943 102.564583 255.000000 140.107411 175.368235 103.214919 255.000000 139.761912 174.413771 103.894318 255.000000 139.477953 173.398066 104.620464 255.000000 139.249432 172.318824 105.341088 255.000000 139.021750 171.244494 106.077424 255.000000 138.792396 170.157694 106.911463 255.000000 138.545068 168.961785 107.660458 255.000000 138.315507 167.870494 108.507466 255.000000 138.064328 166.663841 109.248458 255.000000 137.833337 165.571516 110.106763 255.000000 137.580914 164.356675 110.973400 255.000000 137.327208 163.129303 111.822266 255.000000 137.076218 161.916984 112.681465 255.000000 136.819130 160.696892 113.459545 255.000000 136.462129 159.515640 114.217251 255.000000 136.063525 158.328681 114.876571 255.000000 135.692870 157.252430 115.136869 255.000000 135.432072 156.603978 115.426243 255.000000 135.153801 155.918372 115.721726 255.000000 134.870501 155.221065 116.011637 255.000000 134.588929 154.528382 116.335387 255.000000 134.294104 153.800065 116.625809 255.000000 134.013744 153.117463 116.929221 255.000000 133.728261 152.411349 117.252326 255.000000 133.433799 151.682330 117.577618 255.000000 133.139903 150.957309 117.908354 255.000000 132.844907 150.224762 118.244034 255.000000 132.549426 149.494801 118.626113 255.000000 132.230007 148.697238 118.951057 255.000000 131.936211 147.968618 119.261596 255.000000 131.647459 147.255021 119.625807 255.000000 131.352506 146.456192 120.002946 255.000000 131.072871 145.649662 120.401646 255.000000 130.807412 144.843558 120.843805 255.000000 130.523299 143.989684 121.280416 255.000000 130.238598 143.137523 121.706807 255.000000 129.957912 142.289783 122.130124 255.000000 129.678641 141.449747 CIELAB numbers resulting from softproof: 35.536612 10.253407 8.588838 35.531993 10.289458 8.522461 35.525190 10.326883 8.456049 35.518293 10.363600 8.389875 35.511013 10.399475 8.322734 35.503784 10.434761 8.256445 35.496596 10.470825 8.189692 35.489532 10.507643 8.122524 35.482636 10.544354 8.055323 35.475551 10.580153 7.988108 35.468584 10.616517 7.920860 35.462709 10.652525 7.859384 35.457225 10.688257 7.800620 35.450320 10.725022 7.734385 35.443096 10.761987 7.666564 35.436393 10.799260 7.600700 35.429662 10.836143 7.535014 35.440762 10.868077 7.441352 35.462915 10.913448 7.344791 35.567485 11.102700 7.250909 35.685287 11.279161 7.214756 35.812241 11.450015 7.207985 35.951771 11.580591 7.177563 36.121906 11.619116 7.095966 36.373795 11.690774 7.027561 36.624217 11.762486 6.960854 36.811292 11.819631 6.947351 36.935711 11.891293 7.008322 37.043508 12.002570 6.985327 37.178690 12.168376 6.942854 37.312205 12.333985 6.899755 37.393132 12.496392 6.875480 37.343933 12.650321 6.896518 37.211179 12.659072 6.832382 37.070685 12.641777 6.757998 36.929313 12.625570 6.684488 36.896335 12.665721 6.615757 36.731782 12.735819 6.597360 36.580841 12.665540 6.516897 36.417064 12.540413 6.415430 36.255344 12.415878 6.314391 36.113015 12.320144 6.230710 35.987979 12.256859 6.220574 35.864440 12.194201 6.229447 35.788496 12.101897 6.198255 35.776484 12.128652 6.147188 35.769927 12.134006 6.095506 35.761916 12.122220 6.028268 35.756772 12.116082 5.971776 35.748399 12.103863 5.903639 35.740444 12.092237 5.836116 35.732436 12.080373 5.768086 35.740607 12.095923 5.712688 35.770852 12.146033 5.664809 35.801008 12.196696 5.616588 35.831364 12.247758 5.568306 35.862725 12.300055 5.516033 35.894543 12.352675 5.462972 35.924784 12.403005 5.414736 35.956451 12.454747 5.362167 35.989409 12.507817 5.304951 36.020810 12.559183 5.253266 36.052919 12.611097 5.199122 36.086155 12.664696 5.142001 36.119511 12.718707 5.084916 36.157214 12.774783 5.029673 36.198742 12.832352 4.975781 36.240118 12.890233 4.922130 36.275773 12.943794 4.876221 36.280472 12.943952 4.812306 36.263691 12.935970 4.747105 36.244791 12.925413 4.674562 36.228732 12.918728 4.609805 36.209414 12.907359 4.536567 36.190064 12.896126 4.462672 36.170996 12.885165 4.389839 36.151329 12.874181 4.316113 36.131087 12.873434 4.238046 36.134110 12.913385 4.157002 36.140707 12.957436 4.083282 36.149819 13.000494 4.041645 36.158644 13.044242 3.996662 36.167790 13.089013 3.951128 36.176822 13.133703 3.906075 36.185453 13.178556 3.858175 36.194014 13.222170 3.813995 36.202887 13.266802 3.768537 36.211683 13.311965 3.721150 36.220212 13.356491 3.673748 36.228706 13.400988 3.625943 36.238801 13.425859 3.568431 36.250805 13.436175 3.497613 36.262762 13.449061 3.434240 36.275125 13.463060 3.372467 36.288755 13.474771 3.304247 36.303025 13.484968 3.236860 36.316829 13.491665 3.169371 36.330461 13.496067 3.096409 36.344431 13.501415 3.023685 36.358577 13.507511 2.952143 36.372518 13.513477 2.881106
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Attachment:
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