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 explain. 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 any changes. 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 the PDB. -- Bill
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