On Sat, 2008-11-01 at 01:02 +1030, David Gowers wrote: > Hi Adam, > > On Fri, Oct 31, 2008 at 9:51 PM, Adam C Powell IV <hazelsct@xxxxxxxxxx> wrote: > > Greetings, > > > > I am working on an image processing plug-in (which I'll offer for > > upstream contribution BSD-licensed), and would really like to have a > > couple of primitives that I can't find. > > > > One is finding "islands" in an image: take a channel and create new > > layers each with one contiguous region in the channel. So if the > > channel has ten islands, create ten new layers, each with one of the > > islands. Since this could be unwieldy (too many new layers), one new > > layer with one island would suffice; one could then process that island > > layer, subtract it from the original, and move on. > > > > Another is integrals: zero, first and second moments, or alternatively, > > integrals/sums of channel intensity, x- and y-weighted intensity, and > > x^2, y^2 and xy-weighted intensity. This lets me fit an ellipse to an > > island, and then display major and minor axes. > > > > Finally, opening and storing data files. I'd like to be able to create > > a CSV file with statistics of the islands: size, centroid, aspect ratio > > (major/minor axis ratio), major axis orientation. One could then > > further process these statistics in a spreadsheet or other program. > > > > I can do the first two in scheme, though it would be slow, but tolerable > > for my needs. I don't see a script-fu primitive which would let me do > > the last. > > > > If there are other packages which can do this, that would be helpful. > > But having it in the same program/UI as GIMP, with all of its other > > image manipulation tools, and with its presence across platforms, would > > be even better. I'd love to have your ideas. > > It sounds like you might find working with the combination of > Gimp-Python, NumPy and SciPy more effective. > integration,definitely. Islands, possibly (a browse through > http://scipy.org/scipy/scipy/browser/trunk might help you to find out. > And Python has a CSV module as standard. Okay, thanks for the suggestion. The downsides seem to be: I and others need to install these as well as GIMP to use it, I need to learn Python (yes, I'm one of the tiny handful remaining who know scheme but not python :-), and converting from a GIMP image to something which NumPy/SciPy can quickly sum might not be straightforward. > I had the impression that writing external files was not supported by > Script-Fu; I'm sure Kevin Cozens could tell you. Okay, I look forward to hearing from him. Hmm, I suppose if the output is small enough, this could return it as a list, and one could run it in the script-fu console then copy-and-paste the return value... > Hope that helps, Yes, thanks much. -Adam -- GPG fingerprint: D54D 1AEE B11C CE9B A02B C5DD 526F 01E8 564E E4B6 Engineering consulting with open source tools http://www.opennovation.com/
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