[Bf-compositor] Question regarding changes to blending modes

[Kévin Dietrich]

@Troy: Care to spare some links ? 

And your math is almost the same: (A || B) <= 1 ? screen : lighten; The
only thing is that values above one will get the max value of A or B,
depending on which is the greatest. 

Also here I'm not dealing with 32-bit floats, I'm trying to find a
better way to handle Hue, Sat, Val and Col blend operations to not use
RGB <-> HSV conversions which are flawed by design and produce artfacts.


Le 2014-06-08 00:56, Troy Sobotka a écrit : 

> On Jun 7, 2014 3:20 AM, "Bartek Skorupa (priv)" <bartekskorupa at bartekskorupa.com> wrote:
>>
>> The way I see it:
>> Math is the same, but color spaces are different, so we come up with different results. 
> 
> The math is frequently different. 
> 
> Screen for example in scene referred models is typically:
> A or B <= 1.0 A+B-AB ? max(A,B) 
> 
> max() is often used in place of display referred 1.0 contexts. IIRC, there are a few HDR tools that use whatever the chosen white point value in scene referred is. 
> 
> There is a good amount of forum chatter on this subject at some of the Nuke and other such forums. 
> 
> With respect,
> TJS 
> 
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