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// Copyright (C) 1998-2003 Marti Maria
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// This is a sample on how to build a profile for decoding ITU T.42/Fax JPEG
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// streams. The profile has an additional ability in the input direction of
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// gamut compress values between 85 < a < -85 and -75 < b < 125. This conforms
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// the default range for ITU/T.42 -- See RFC 2301, section 6.2.3 for details
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// These functions does convert the encoding of ITUFAX to floating point
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void ITU2Lab(WORD In[3], LPcmsCIELab Lab)
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Lab -> L = (double) In[0] / 655.35;
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Lab -> a = (double) 170.* (In[1] - 32768.) / 65535.;
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Lab -> b = (double) 200.* (In[2] - 24576.) / 65535.;
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void Lab2ITU(LPcmsCIELab Lab, WORD Out[3])
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Out[0] = (WORD) floor((double) (Lab -> L / 100.)* 65535. + 0.5);
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Out[1] = (WORD) floor((double) (Lab -> a / 170.)* 65535. + 32768. + 0.5);
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Out[2] = (WORD) floor((double) (Lab -> b / 200.)* 65535. + 24576. + 0.5);
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// These are the samplers-- They are passed as callbacks to cmsSample3DGrid()
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// then, cmsSample3DGrid() will sweel whole Lab gamut calling these functions
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// once for each node. In[] will contain the Lab PCS value to convert to ITUFAX
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// on InputDirection, or the ITUFAX value to convert to Lab in OutputDirection
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// You can change the number of sample points if desired, the algorithm will
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// remain same. 33 points gives good accurancy, but you can reduce to 22 or less
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// is space is critical
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#define GRID_POINTS 33
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int InputDirection(register WORD In[], register WORD Out[], register LPVOID Cargo)
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cmsLabEncoded2Float(&Lab, In);
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cmsClampLab(&Lab, 85, -85, 125, -75); // This function does the necessary gamut remapping
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int OutputDirection(register WORD In[], register WORD Out[], register LPVOID Cargo)
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cmsFloat2LabEncoded(Out, &Lab);
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// The main entry point. Just create a profile an populate it with required tags.
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// note that cmsOpenProfileFromFile("itufax.icm", "w") will NOT delete the file
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// if already exists. This is for obvious safety reasons.
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int main(int argc, char *argv[])
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cmsHPROFILE hProfile;
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fprintf(stderr, "Creating itufax.icm...");
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unlink("itufax.icm");
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hProfile = cmsOpenProfileFromFile("itufax.icm", "w");
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AToB0 = cmsAllocLUT();
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BToA0 = cmsAllocLUT();
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cmsAlloc3DGrid(AToB0, GRID_POINTS, 3, 3);
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cmsAlloc3DGrid(BToA0, GRID_POINTS, 3, 3);
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cmsSample3DGrid(AToB0, InputDirection, NULL, 0);
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cmsSample3DGrid(BToA0, OutputDirection, NULL, 0);
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cmsAddTag(hProfile, icSigAToB0Tag, AToB0);
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cmsAddTag(hProfile, icSigBToA0Tag, BToA0);
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cmsSetColorSpace(hProfile, icSigLabData);
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cmsSetPCS(hProfile, icSigLabData);
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cmsSetDeviceClass(hProfile, icSigColorSpaceClass);
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cmsAddTag(hProfile, icSigProfileDescriptionTag, "ITU T.42/Fax JPEG CIEL*a*b*");
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cmsAddTag(hProfile, icSigCopyrightTag, "No Copyright, use freely.");
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cmsAddTag(hProfile, icSigDeviceMfgDescTag, "Little cms");
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cmsAddTag(hProfile, icSigDeviceModelDescTag, "ITU T.42/Fax JPEG CIEL*a*b*");
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cmsCloseProfile(hProfile);
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fprintf(stderr, "Done.\n");
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samples/itufax.c
