Hi,
If you want a comparative with Windows ICM2,
there is a test already coded in the testbed program.
Here is how to activate it:
- Locate the file testcms.c in "Testbed" project. In the first few lines you will see the line #define ICM_COMPARATIVE 1 commented out. Uncomment it.
- Then in the directory "testbed", there is a profile called " sRGBSpac.icm". This is a LUT-based sRGB space. In order to operate ICM2, this profile should be installed, so right-click it and select "install". This would copy the profile into color directory and make it visible to ICM2. Then you can compile the testbed and execute it. After the normal checks, it will launch a performance comparison.
Keep in mind ICM has a "quick and no so accurate" method that lcms has not, so in order to match equal conditions, ICM should operate in BEST_MODE.
In my development platform, (AMD Athlon 64 4000+, VC7.1) lcms is way faster than ICM. Here are the results:
Comparative with MS-Windows ICM (8 bits per sample): Windows ICM is transforming full spectrum...done. [7531 tics, 7.531 sec.] lcms is transforming full spectrum...done. [2875 tics, 2.875 sec.]
Comparative with MS-Windows ICM (16 bits per sample): Windows ICM is transforming full spectrum...done. [6063 tics, 6.063 sec.] lcms is transforming full spectrum...done. [3109 tics, 3.109 sec.]
Also, there is another conditional #define to check performance. #define CHECK_SPEED 1
Here it gives me:
lcms is transforming full spectrum...done. [4203 tics, 4.203 sec, 7.61361 Mb/sec.]
But note I am seeting VC7.1 at full optimization, and USE_ASSEMBLER in lcms.h
lcms versions prior to 1.13 are quite slow, 1.13 and specially 1.14 are much better on performance.
Hope this helps, -- Marti Maria The littlecms project. www.littlecms.com
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