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rbrande: DScaler processes YUV values, and the gamma filter only remaps the luma value (Y). Currently, there isn't a filter that remaps all three values.


Nota bene: This would take a lot of CPU, if a filter were created.


What are you trying to do?
 

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Discussion Starter · #3 ·
dschmelzer,


Thanks for your response.


I have a projector (Hitach 5500) which has serious color cast problems at low IREs. It is not trivial to correct for this in the projector itself, so I wanted to correct it in the HTPC instead by altering the gamma curve:


For example, let's say that I have a gamma curve with G=2.5. Then, for each IRE there is a corresponding intensity, I, for each color, c, where c= Red, Green or Blue.


Thus, normally (assuming no bias):

I(c, IRE)=B*(IRE)^G


For example, for Green (with B=0.001 & G=2.5):


I(Green, IRE)=0, 0.316, 1.789,....., 100

for IRE=0, 10, 20,....., 100


However, I would like a modified relationship I* (more green at IRE 0 and 10):


I*(Green, IRE)=0.32, 0.35, 1.789,....., 100

for IRE=0, 10, 20,....., 100


Do you know if there is any software that can remapp the gamma values? Powerstrip's pop-up help hints to a non-linear gamma ramp by writing values to the registry (HKLM\\Software\\EnTech\\LUT). Not sure how to do this though.....
 

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I'm bumping this one up. Interesting problem, but really don't know what I can add to the discussion at this point.
 

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Is there a program that will convert the table generated in Displaymate for Dcslaer-or do I have to do it by hand?


joel
 
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