William Skaggs wrote:
I've been thinking about three things that are highly desired but
have been waiting for the migration to gegl: support for 16 bits,
layer groups, and procedural layers. It seems to me that all of
them can be achieved in GIMP 2 without major infrastructure changes,
not perhaps in the most ideal way, but not in a kludgy way either.
Given that the switch to gegl will probably entail a long development
cycle, it may be worth considering what can be done in the meantime
with GIMP 2.
In this email I will discuss the 16-bit-depth issue, and leave the others for later.
The basic idea for supporting 16 bits is to treat a 16-bit layer as two 8-bit layers, a "main" layer for the high byte and an "auxiliary" layer for the low byte. The auxiliary layer would never be visible, would not appear in the Layers dialog, and would always move together with the main layer.
The thing that makes this approach feasible is that for most purposes the low byte of a 16-bit layer is invisible to the user. As a starting point, then, it can simply be ignored in computing the projection. (Some composition modes, particularly "divide", may ultimately want to make use of it, though.)
The program would then be to build 16-bit support gradually into tools and filters. It needn't be done all at once, because a lack of 16 bit support simply means ignoring the low byte of the input, which is not a disaster in the great majority of cases.
There are really only two things, as far as I can see, that would need to be done right at the start: change the Layers dialog so that auxiliary layers don't appear, and change the layer-moving commands so that main and auxiliary layers move together. Everything else could be added over time, and nothing in GIMP would be seriously broken during the process.
I look forward to feedback :-).
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