Re: [Gimp-user] why no difference of gaussians on layer masks? gimp 2.7.5

[Gary Aitken <gimp dreamchaser org>]

Hi Alexandre,

Yes, I'm aware that I can work around it as you mention, and have been 
doing so.  But it is a pain in the rear, and unless there is some 
over-riding reason for not allowing one to do this operation, it seems 
the gimp should allow it.

My main reason for posting was to see if it is a known issue and decided 
to be left as-is.  I don't see an open bug for it.  I suspect it may be 
a relic of implementation difficulties and so a capability which may be 
desirable but a bit awkward to implement.

Thanks,

Gary

On 1/21/2012 12:39 PM, Alexandre Prokoudine wrote:
> On Fri, Jan 20, 2012 at 11:02 PM, Gary Aitken wrote:
> > Hello all,
> >
> > gimp 2.7.5 on winXP, unfortunately.  New hardware problems on my freebsd
> > system.  grr.  Anyway...
> >
> > Why won't the gimp allow me to use a difference of gaussians on a layer
> > mask?  This seems like a perfectly fine thing to do for edge detection, and
> > indeed, other edge-detect algorithms work:
> >
> > For example:
> >   New layer mask, from grayscale copy of layer
> >   Filters / edge-detect / difference of gaussians says:
> >     Execution error for 'Difference of Gaussians':
> >     Can operate on layers only (but was called on channel or mask).
> > but
> >   Filters / edge-detect / Edge...
> >     works fine
> >
> > Is this a bug, or am I missing something?
> > Any insights would be appreciated,
>
> Hi Gary,
>
> Not sure about the technical side of this, but you should be able to
> perfectly work around that.
>
> 1. Enable display of the mask via right-click menu so that the mask is
> displayed instead of the layers's contents.
> 2. Layers>  New from Visible.
> 3. Apply your filter to that layer.
> 4. Copy all of the layer's contents and paste it into the mask.
> 5. Remove or disable the extra layer you created.
>
> Alexandre Prokoudine
> http://libregraphicsworld.org
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