Re: [Lcms-user] How does a transformation work

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Am Freitag, 29. Dezember 2023, 14:01:40 CET schrieb mar...@li...:
> Hi,
> 
> From your explanation, it seems to me that the transformation you want has 
nothing to do with color management. You
> know nothing about the L* of your grayscale and need only some scaling. I 
would rather use simple math in this case:
> 
> Gray_out = (Gray_in * 40) /51 + 40;
> 
> You could just use a for() loop. This is going to be faster that using any 
color management routines.

Hmm. It just was a test to understand how it (may) works.
The profile I create is used in the muPDF library to create a greyscale out 
from a PDF document. I would expect, any kind of PDF could be rasterized into 
a greyscale raster this way.

Cheers,
Jürgen