On 10/27/07, Valerie VK <[EMAIL PROTECTED]> wrote:
> > Okay I want to clear this up:
> > GEGL *is* coded (see www.gegl.org), and already in use by a few
> > different applications.
> Much apologies. I was always under the impression that while there
> is a working version, more work could have been used for adding
> features and such. I blame my lack of understanding of what GEGL is
> supposed to Do, as opposed to what it will Allow Gimp to do.
> > It works. Getting it working fast and bugfree, though (for instance,
> > good caching behaviour), will be driven by use in GIMP, which will
> > help to locate slow and buggy areas of GEGL.
> This makes sense.
> > Initial integration will probably be a fussy business, rather than a
> > particularly large one -- making sure that a) it's used right and b)
> > the parts that should use it, do use it.
> Basically, what's needed is a roadmap of how GEGL will be integrated?
> Complete with a definition of all the parts that need to use it, and
> how?
> Maybe this should be developed before a Gimp roadmap is defined? This
> way developers would have a better idea of how much work will need to
> be done to integrate GEGL, and how it can be distributed into different
> releases.

Yes, that would be a good idea. It's easy to get lost in the GIMP
code, so a way to limit what developers need to look at would probably
attract more developers.

> > It's worth a minute to point out the notable, and deserved, absence of
> > adjustment layers from this list.  People have had a few discussions
> > (here? certainly on bugzilla.) about this topic, and it arose that:
> > a) Adjustment layers are generally an ugly, complicated idea
> > b) They are also an unnecessary idea -- the combination of layer
> > effects and layer grouping can produce the same effects in a much more
> > sensible way.
> Thanks for the explanation! I actually had no idea what the difference
> between adjustment layers and layer effects is supposed to be, so didn't
> dare to add it twice. ;)
Actually I think I didn't explain the difference between adjustment
layers and layer effects.

Adjustment layer: a layer that modifies the layers below it, without
actually contributing pixel data. An adjustment layer as used in
Photoshop, has a mask, but no pixel data.
http://www.phong.com/tutorials/adjust/ provides some examples,
including eg. Curves adjustment.

Layer effect: an effect attached to a layer -- for example, "Drop
shadow" is a layer effect provided by Photoshop. Takes the layer pixel
data and applies some effect to it. May have a mask, and does not have
its own pixel data, so the only difference is the way it's attached to
a specific layer.
Peter suggested here:
that layer effects could be thought of (and displayed as) a stack
per-layer, sitting underneath the layer.
Gimp-developer mailing list

Reply via email to