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klausdoege
Germany
389 Posts |
 Posted - Jul 31 2011 : 04:37:22
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Hello,
I believe, the function IERGB2CIELAB returns no correct results.
The value RGB(255,255,255), returns LAB(249,0,0).
LAB(255,0,0) is correct however.
Actually also LAB(100,0,0 must it, is.
Maybe, you can check that.
Greetings
Klaus
Klaus |
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fab
1310 Posts |
Posted - Aug 01 2011 : 00:19:16
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Hello,
you should get LAB(250,0,0) instead of LAB(249,0,0). Anyway it is still wrong.
This problem will be fixed in next minor release, with following change in hyieutils.pas, function IERGB2CIELAB:
instead of:
result.L := trunc(L*2.50);
write:
result.L := trunc(L*2.55);
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klausdoege
Germany
389 Posts |
Posted - Aug 01 2011 : 06:39:29
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O.K. thanks,
then I correct that in my source code until then.
Klaus |
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klausdoege
Germany
389 Posts |
Posted - Sep 02 2011 : 06:07:20
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Hello,
I have enforced the alteration.
the result looks already well.
But RGB(255,255,255) is not Lab(255,0,0) but Lab(254,0,0)
Another small miscalculation is there maybe?
regards
Klaus |
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fab
1310 Posts |
Posted - Sep 05 2011 : 10:21:50
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Hello,
in my tests IERGB2CIELAB(CreateRGB(255,255,255)) returns TCIELAB(255,0,0), which seems correct to me. |
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klausdoege
Germany
389 Posts |
Posted - Sep 12 2011 : 05:03:35
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Yes I has tried it, so it is OK.
But in my application, it is wrong.
There, I must seek again.
Thanks.
Klaus |
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function IERGB2CIELAB = Wrong ?
