Impasto discussion

[Boudewijn Rempt]

On Friday 09 July 2010, Matthew Woehlke wrote:
> Boudewijn Rempt wrote:
> > On Wednesday 07 July 2010, JL VT wrote:
> >> As the attached diagram explains, when the user stacks many layers,
> >> what's visible to him is the OVERLAP of the layer's colors, while,
> >> intuitively, a stack of impasto layers should look like the SUM of all
> >> the thickness in each layer.
> > 
> > That's worrying me a bit, because I think that very soon when painting
> > all pixels will have max height. I guess that's why Corel Painter only
> > has one impasto layer.
> 
> Eh? Maybe you have a different version than I, but in mine, each layer
> has its own impasto. (Yes, you can reach max height. Ideally we should
> strive to avoid that, probably by using at least 16-bpp, maybe even f32,
> at least in the composition step.)

As far as I can tell from my copy of Corel Painter (version X, I think), 
there's one impasto effect layer that can be turned on and off, and painting 
with an impasto brush affects that layer no matter which color layer I am on.

-- 
Boudewijn Rempt | http://www.valdyas.org