On Saturday 26 July 2003 5:44 am, Adam D. Moss wrote:
> Joao S. O. Bueno wrote:
> > My idea is that in the end, the custom layer formulas get
> > recorded in a gimp directory, just like brushes and patterns.
>
> How are they recorded in the XCF file? (I may have missed
> that part of the thread.)
Parasites. So the only difference to current XCF files would be anm
extra layer_mode number.
> > So, a set
> >
> > ofrather itneresting formulas would be shipped with the Gimp (or
> > with the patch).
>
> Users won't apply patches -- I doubt that more than a couple of
> percent of users are even actually building from source (especially
> for 2.0).
yes..that is why I'd be very pleased to see it in 2.0 (but even if I
get it ready, it will be so close to freeze date, that maybe the
mainteners reject it), or at least for 2.2 .
> >>Hey, maybe you can fit into it effect layers. ;] Well, probably
> >>not, they are not simple operations to layers below them. Depends
> >>if you want to apply filter to the result, which is just the call
> >>idea, or to the layer data only,
> >
> > Actually, thta already happens.
> > The formulas are simply. The input operands are the letters
> > describing a channel, followed by "1" if the channel belongs to
> > the image bellow, or "2" if it belongs to the actual layer. And
> > letter+D makes the destiantion channel.
> > So something like:
> > RD=R2*R2; GD=G2*G2; BD=B2*B2;
> > will actually square the values of each channel. Since they are
> > treated as normalized (i.e. from 0 to 1), it's akim to using the
> > curves tool to enhance contrast sharply.
>
> (Well, contrast enhancement would be more like a sigmoid
> function -- what you describe here is basically gamma adjustment
> for a fixed gamma value.)
Ok, gamma them. Sorry, I am not versed in the mathematic
fundamentals of thes corrections. However I will implement an
exponentiatio operand - so one may use other gammas as well. But
it�will have to use F.P. so expect it to be _slow_ .
> I think that what GSR is really asking for in effect layers
> is stuff like 'blur layers', 'pixelize layers', etc, which
> basically is what everyone really wants. :) These require
> a decorrelation between the positions of pixels of different
> drawables though -- I made a working prototype of this
> during 1.1.x and it wasn't pretty.
Yes...no way to do taht just hacking in the paint-funcs already
existing.
> > On the technical side - I will need to code in some string
> > manipulation now.
> > Are there API's for string deeply hidden ing gtk/gimplib?
>
> Not as such -- but if you're using GTK/gimplib then you're
> already using glib, which has some great string manipulation
> functions (go look them up).
Thanx. I will. :-)
> --Adam
JS
-><-
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