[Sidefx-houdini-list] cop's log 2 lin

Peter Robbinson probbins at sympatico.ca
Fri Jan 9 13:04:28 EST 2009


I wouldn't expect a log image in a game engine, and it will likely be 8 
bit as well won't it?
When you MMB on one of the cop nodes, what's it telling you?

PeterR

Ben Schrijvers wrote:
> No I'm looking at a Z-buffer of our game engine.
> Not even sure if it's really a log image and the coder went already home 
> or are getting drunk downstairs :-)
>
> I've found that it looks a lot better when I do:
> 1 / (1-image)
>
> cheers,
> benS
>
>
> Andrew D Lyons wrote:
>   
>> Is this the kind of image you are dealing with?
>>
>> http://www.imagemagick.org/www/motion-picture.html
>>
>> I'd guess you would need to know the black point,white point, and
>> gamma with which the image were encoded...
>>
>> Cheers
>>
>>
>>
>> 2009/1/9 Ben Schrijvers <ben.schrijvers at guerrilla-games.com>:
>>   
>>     
>>> Hi there,
>>>
>>> In COP's how do I convert from a log image to a linear image?
>>>
>>> I've found a log(x) function in the Function Cop but somehow that gives
>>> me negative values.
>>> But that probably the wrong way around in that it's lin to log.
>>> So what's the inverse? Obviously I've got now idea what I'm talking about...
>>>
>>> cheers,
>>> benS
>>>
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>>>       
>>
>>   
>>     
>
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>   

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