Re: [Gimp-user] spread pixels colors at selection border

[Ofnuts <ofnuts laposte net>]

On 08/21/2013 02:54 PM, Kokopalen wrote:
> El 21/08/2013 13:09, "pitibonom" <forums gimpusers com> escribió:
> > Hi :)
> >
> > Does anyone know wether it's possible to spread the pixels colors
> considering
> > the normal vector of the selection curve ?
> Maybe you could implement a script to do the following:
> - Border selection with a width of 1 pixel.
> - Copy.
> - Paste as new layer.
> - Scale this new layer to be one pixel bigger.
> - Paste as new layer, scale to be two pixels bigger.
> - Paste as new layer, scale to be three pixels bigger.
> - ... Repeat as many times as needed.
> - Flatten the image or combine layers.
>
> Not sure if that is something similar to what you want to do, but it would
> be curious to see how it looks like :).

I would do it differently, using a path (which is very easily obtained 
from the selection):

- walk the path by fixed steps:
- at each step:
 -- sample the color on the path
 -- compute the normal segment (with length=width) at the point a 
half-step before (which is the "after" of the previous step)
 -- compute the normal segment at the point a half-step after
 -- create a quadrangle path from these two segments
 -- create  a selection from that path
 -- bucket-fill with the color sampled above

Might be a bit slow :)