I've had a similar idea than yours, and implemented it right away. But
instead of changing zones with keystrokes, the zone can be selected
using the crosspoint of two perpendicular guides. I know this is ugly,
and maybe your idea about changing to next/previous zone is better.
Here it is:

http://www.box.net/public/arhs7a3h9m

I'm sorry but not direct link. I cannot register it to the gimp
registry, because of http errors. And a fine tutorial:

http://wiki.gimp.org/gimp/DrawingZones

Regards,
Manuel


2007/1/17, David Gowers <[EMAIL PROTECTED]>:
>
>
>
> On 1/18/07, Joao S. O. Bueno Calligaris <[EMAIL PROTECTED]> wrote:
> > Ok - I've read the request and got the idea.
> >
> > I have the followwing proposal:
> > what if one had a set of pre-loaded selections, and could switch back
> > and forth among then with a single keystroke - Do you (and others)
> > think it could  be as usefull/more usefull/just the same as these
> > proposed drawing zones?
> >
> > Why do I ask this?
> > Because implementing what you are asking requires some fiddling in the
> > core, and will complicate the interface with another kind of object,
> > besides selections, channels, layers, masks, guides, sample points
> > and the grid...
> >
> > Ok, you can imagine that what it brings of convenience for some it
> > brings of complication to certain user groups.
> >
> > The idea I propose, instead, would use already existing objects, like
> > this: one would store his drawing zones as a set of selections, each
> > in a separate image channel, and a simple script, with no imput
> > parameters, would replace the current selection with a selection in
> > the channel stack.
> >
> > Todo this manually, one would have to:
> > 1) select the channel tab in the layers/channels dock
> > 2) select the apropriate channel
> > 3) click on "channel to selection"
> > 4) change back to the layers tab on the dock
> > 5) select the actyual layer where one is drawing back
> > 6) start painting.
> >
> > Looking at this, it si a lot of work, and the drawing zones seems a
> > better idea.
> > However, a script fu can perform steps 1-5 with a single keystroke (if
> > one will select the next/same/previous channel on the stack that has
> > been previusly used). so it becomes:
> > 1) hit key that changes teh selection until the desired selection is
> > set
> > 2) start painting
> >
> > Which seems as practical as the drawing zones proposal.
> >
> > There is a final advantage in this proposal: it is ready for serving
> > _now_,a s writing such a script would take less than 30min.
> >
> > What do you say?
> >
> >         js
> >         -><-
>
> That sounds good. It allows some sort of status display (make the active
> zone the only visible channel) and is flexible.
> It misses one of the values of binary, mutually-exclusive selections, though
> -- they can all be stored in
> one channel, and if you decide a certain area should belong to a different
> zone, you only have to fill that area on one channel.
>
> In Python, this is fairly simple to implement:
>  * Name the channel like "10-Zonemap; Current: AA"
>    (layertattoo-Zonemap; current: XX)
>
>  * The cycle op extracts the 'current' specifier (ranging 00-ff -- ie a
> pixel intensity in hex) and chooses the next unique value found in the
> channel. It loads the zonemap into the selection and thresholds it
> accordingly.
>     Then it updates the channel name: "10-Zonemap; Current: CC"
>
> I want this, so I'll implement it today.
>
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>
>
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