Hi Øyvind, On Thu, Jun 26, 2008 at 10:01 PM, Øyvind Kolås <[EMAIL PROTECTED]> wrote: > On Thu, Jun 26, 2008 at 12:05 PM, yahvuu <[EMAIL PROTECTED]> wrote: >> Øyvind Kolås schrieb: >>> Making the blur filter assume the >>> buffer abyss (the region outside the defined image) to be transparent >>> and extend the defined region by the kernel radius gives what I expect >>> as the result from blurring it, a rectangle with a fuzzy edge. >> >> GIMP allows to blur a layer without getting fuzzy edges. >> How will GEGL serve this use case? > > Formulated like that, this is GIMPs problem not GEGLs problem, one way > to achieve this is to crop the resulting image to the pre-extended > extents, I suspect that the result on the edges by doing this, will be > roughly equivalent to what you get in GIMP when blurring a > layer/rectangular selection etc. > > Another option is to define a new operation that doesn't grow, that > also encodes the edge/abyss behavior (I hve written som GEGL > operations based on random sampling of the neighbourhood that discards > the random sample if it falls outside the defined area and does > another random one instead). > > Another option that hasn't been fully explored that might prove more > fruitful is allowing GeglBuffers to define the abyss/edge behavior. > Whether the abyss is transparent blank (or opaque black for no alpha) > like it is now or it mirrors/extends pixel data.
I believe tiling/wrapping would be more useful than mirroring. Right now, I know two applications, tiling and texturing, where tiled edge behaviour would help; Offhand, I cannot think of any way to employ mirroring abyss behaviour at all. Are there any? David _______________________________________________ Gegl-developer mailing list [email protected] https://lists.XCF.Berkeley.EDU/mailman/listinfo/gegl-developer
