Hi, Yes, lcms does support planar data. The only condition is the output buffer has to have space enough to hold all planes CONTIGUOUS.
So, your example would work if you use a big array char chOutput[3+3+3+3]; Then, after cmsDoTransform, you have the array filled with CCCMMMYYYKKK. The format specifier is TYPE_CMYK_8_PLANAR. Besides... do you have tried your code? it seems it should work untouched. Just change the definition of output buffer and then cmsDoTransform(hTransform, chInput, chOutput, 3); Hope this helps, Mart� Maria The little cms project http://www.littlecms.com [EMAIL PROTECTED] ----- Original Message ----- From: "Ilja Fiers" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, February 26, 2003 2:05 PM Subject: [Lcms-user] Question using planar configuration > Hello Marti & all lcms users, > > First of all, thanks for a great product, it is very well written and > usefull! I have got a question about using the lcms engine in planar > configuration. What i would like to do is offer the engine RGB data, and get > a planar result back. But maybe i misinterpreted the word planar. A code > example would be easyest i think.. Would the following be possible: > > //========================================================================== > ================================ > > // RGB value on input is 3 pixels, rgb 20,30,40, rgb 50, 60,70, rgb 200, > 210, 200 > // so, data format is RGBRGBRGB in one chunk of data > > unsigned char chInput[9] = {20,100,40, 50,70,60, 200,0,220}; > > // output format is a separate array for c, m, y and k..., all of them three > bytes in this case > > char chOutputC[3]; > char chOutputM[3]; > char chOutputY[3]; > char chOutputK[3]; > > // rest of the abbreviated code > > hInProfile = cmsOpenProfileFromFile("in.icc", "r"); > hOutProfile = cmsOpenProfileFromFile("out.icc", "r"); > hTransform = cmsCreateTransform(hInProfile, TYPE_RGB_8, hOutProfile, > TYPE_CMYK_8_PLANAR, INTENT_PERCEPTUAL, 0); > > // do the transformation in one step... > cmsDoTransform(hTransform, chInput, ?????, 3); // transform 3 pixels... > > //========================================================================== > ================================ > > Of course, this would be possible by converting the data to CMYKCMYKCMYK > format using lcms, and then copying it myself to the separate planes. > However, i think this would give me a speed penalty (does it?) since the > engine might be optimised to do such a conversion directly. > So, my question is: how do i offer the output data to the engine, if this is > at all possible, and what output type do i request from cmsCreateTransform?? > > Thanks for any suggestions.. > > Ilja Fiers > > > > > ------------------------------------------------------- > This SF.NET email is sponsored by: > SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See! > http://www.vasoftware.com > _______________________________________________ > Lcms-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/lcms-user > > ------------------------------------------------------- This SF.NET email is sponsored by: SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See! http://www.vasoftware.com _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
