On Wed, Apr 29, 2009 at 4:10 AM, Martin Nordholts <enselic@xxxxxxxxx> wrote: > yahvuu wrote: >> Hi all, >> >> Alchemie foto\grafiche schrieb: >> >>> The possibility to add "CUSTOM " layer modes [..] >>> >> >> that sounds interesting. Just curious: i wonder how custom layer modes >> differ from filters that take a second layer as input (e.g. LIC)? >> i mean, other than that filters currently work destructively. >> > > Hi, > > A layer mode is a formula for blending two pixels together, producing a > result pixel. That is, the set of all layer modes is a subset of the set > of all filters that blends two layers together, producing a result layer. > > There is one exception to this nice classification of layer modes; an > output pixel when using the Dissolve layer mode does not only depend on > two pixels, also on the position of these pixels. > > Spontaneously I don't think custom layer modes is a good idea. Might be > fun for programmers to play with, but graphic professionals? While this is generally true... when switching apps, with a strongly established workflow including an app-specific layer mode, I can see this being quite useful. OTOH, this could also be implemented by a drop-in replacement for layer merging that supports additional modes (ranging 0x80...0xfe in ID, perhaps), providing that contributing a new mode to such a GEGL op could be as painless and simple as writing the formula. And that method would be faster. Alternatively If you really need 'custom' layer modes, I see no reason why it cannot be applied as a layer effect, building a bit of GEGL graph from the existing layer modes and ops. So now that I've thought that out loud, My conclusion is: Could be quite helpful, we don't need full custom layer modes, If we support them in one way through layer effects, someone else could write a GEGL Op that implements formulaic customization separate to GIMP's codebase. David _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
