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Hi Ninanoki

A bit confused about your question.   If you have the info panel open to the color sample values and they are display in Lab and 16 bit as shown in this image:

[ATTACH]69712[/ATTACH]

then to convert from the 15 bit values to the smaller lab values

1) Divide the 15 bit L value by 327.68

2) Divide the "a" and "b" values by 128

That will give you the small Lab values with

L range 0 to 100

a,b values in the range -128 to 127

That is just straight forward mathematical scaling from one range to another.

Hope that helps.  If note, add more specific step by step to you post for more clarity on what you did.