I've made a few tweaks to the "Edge" plug-in in the development branch,
in order to make it easier to use and understand, which I would like to
1) Changed the menu entry from "Edge" to "Sharp Edges". Having an
entry called "Edge" in the "Edge-detect" category is silly, and the
thing that distinguishes this plugin is that it detects edges
between neighboring pixels, that is, sharp edges.
2) Added an "invert" control, so that you can see the edges as dark
lines on a light background. Without this, the preview is almost
useless. I did some voodoo to make "invert" the default for
interactive use, but not to change the result when "edge" is called
from the PDB. The new "invert" argument is optional. If it is
omitted, a value of FALSE is used, which gives the same behavior as
the plug-in has had previously. Therefore, no existing script that
uses this plug-in should change its behavior.
3) Changed the default method to Prewitt, which I believe gives the
closest match to what users are hoping for. I renamed the
method-selector menu from "Algorithm" to "Method", and renamed the
Prewitt entry to "Default", also putting it at the top.
4) Removed the "wrap-style" radio buttons from the interface, on the
grounds that the choice between "Wrap", "Smear", and "Black" is
puzzling to users, and that almost always Smear is the only choice
that makes sense. (Smear means that the edge of the image or
selection does not get treated as an edge for edge-detection.
This option is still present in the pdb interface, though, without
I would like to follow up on this, unless anybody objects, by removing
the Sobel and Laplace entries from the Edge-detect menu (but not from
the PDB). Both of these methods are available in the Edge plug-in,
and neither is very useful for interactive usage. They are, however,
potentially quite useful in scripts, so I think they should stay in
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