yahvuu schrieb:
> Hi all,
> On Sun, May 17, 2009 at 10:39 PM, Daniel Johannsen
> <d...@danieljohannsen.de> wrote:
>> Solution suggestion: A parent base layer determines alpha values for a
>> dependent stack of child layers above the base layer.
>> Then the last layer on top of the child stack e.g. could be the
>> "athmosphere color" for the silhouette of the base layer.
> i wonder, is what you're proposing the same as the 'group layers
> masks' described in
> https://lists.xcf.berkeley.edu/lists/gimp-developer/2009-April/022118.html ?
> Is this already covered by http://bugzilla.gnome.org/show_bug.cgi?id=51112 ?
> Do you envision a user interface for this? The UI Brainstorm always welcomes
> cool mock-ups: http://gimp-brainstorm.blogspot.com/
> greetings,
> peter
Hi to all,
yes your links point in the right direction. I agree, the term "layer 
group mask" hits the mark.
I only like to add, that in the layer group it is the alpha value of the 
lowest layer in the group
which provides the masking effect for the grouped layers above.
(And not a layer in the middle or on top of the group.)

I am not surprised, that this feature is used a lot in photoshop (here 
it is called "clipping mask").

Some examples in order to stress how important this is for the painting 

1)One can start with searching for a good composition by defining only 
Then, in dependency of the silhouette, you can add volume and texture 
layers above the silhouette.

2)Often the shapes are not known in advance. Then they are dependend of 
normally subsequent painting steps
like adding volume and texture layers. With layer group masks one can 
quickly correct all the layers of the object
only by manipulating the base shape layer.

3)Painting objects made of transparent materials like colored glass.
The layer group mask feature would look like the following:
* top layer: highlights (dependent)
* middle layer: glass texture (dependent)
* underlying layer: glass shape in the color of the glass with 50% 
opacity (defines the transparency for the dependent layers)

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