[Bf-compositor] Clamping (Mix, Math, RGB Curves)

[Troy Sobotka]

On May 23, 2014 1:56 PM, "Bartek Skorupa (priv)" <
bartekskorupa at bartekskorupa.com> wrote:

> When I say: "clamp blacks" I always mean: set every value below 0.0 to
0.0.
> When I say: "clamp whites" I always mean: set every value above 1.0 to
1.0.
> Every compositing artist will know what I mean.

If we can generate a clamp / scale node, I am all for it.

I am saying there is no concept of white in a scene referred model, and as
such, you have to be careful as to not write nodes that break the system.

It is that simple. No white. No brighter than white. So sorry, “Every
artist...” is actually “Every artist unfamiliar with HDR work.”

So a clamp node _must_ not make the erroneous assumption that 1.0 means
anything special, and rather provide for an arbitrary value range.

If this all seems like speaking an alien language, it is precisely why I
chimed in and said “Whoa.”

There are already nodes that are broken because of erroneous assumptions.
It would be a shame to make more.

With respect,
TJS
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