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Average Layer
May 24, 2008 - 08:58 — oeller
This script is intended for a series of photographs with (on each photgraph different) unwanted objects on it, e.g. a large place with moving people.
Update!
V1.1 works with rectangular selections! The plugin creates a new layer or a new image consisting of the arithmetical, geometrical or harmonic mean of every pixel, thereby creating a 'ghost effect' of the moving objects. If rather you want to remove objects, choose the 'cutoff' function, which removes outlier pixels after sorting the RGB values. This is also known as winsorizing. Also median and mode remove outliers, but less efficiently.For best results, try to cutoff only on dark, bright or on both sides. Working on selections only greatly improves speed. Just make a rectangular selection in your image and then call the "Average Layer" script.
This was inspired by reports of a friend of mine on a Photoshop plugin, which also removes unwanted objects from a series of photographs. I haven't seen it myself nor do I know the algorithm behind it. If someone knows better algorithms than winsorizing means, tips are welcome!
Prerequisites
You need Scipy, a scientific computing package for python. Get it at the Scipy homepage.
Example
Before:
After arithmetical mean with 67% cutoff (dark outlier pixels):
Some shades are still left, one might correct this quite easily with other tools.
| Attachment | Size |
|---|---|
| Iron_Teddy_1.jpg | 5.14 KB |
| Iron_Teddy_Arithmetical_Mean_Cutoff_dark.jpg | 1.69 KB |
| average_layer.py | 8.7 KB |
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Comments
error in median filter?
Tried your nice plugin with 3 sample shots. The result was that "median" filter crashed with error text:
File "C:\Program Files\GIMP-2.0\lib\gimp\2.0\plug-ins\average_layer.py", line 205, in do_the_workworking_class.export()
File "C:\Program Files\GIMP-2.0\lib\gimp\2.0\plug-ins\average_layer.py", line 183, in export
self.write_out(meanlayer, self.meanarray)
File "C:\Program Files\GIMP-2.0\lib\gimp\2.0\plug-ins\average_layer.py", line 95, in write_out
assert(byte_image.size == self.selection_width * self.selection_height * self.bpp)
AssertionError
-> heeelp...
Edit: it seems that this line returns an empty array:
self.meanarray=median(self.sarray)Image size?
I cannot reproduce this error.
Are your images all of the exact same size?
oeller
installation
I've just copied both of your scripts (collect layer, average layer) to my plugins-folder. While collect-layer works, I can't find the average-layer-plugin, neither under filters ... nor under Xtns/PythonFu/Console/Browse. Any idea? Thanks in advance!
(WinXP, Gimp 2.4.5)
Installation
You should find it under /Filters/Layer Effects. If still not found, check executable bit (at least on unix/linux). Hope this helps!
:-(
No, it doesn't appear in the filters menu and could not be found by pythonfu-console-browser. I'm working on WinXP, so is there any equivalent to this "executable bit" in the Win-world? Ok, let's see if some other Win-user drops by.
Btw, a big applause for your script!! I've often heard about this PS-plugin so it's really great to have s.th. similiar for our Gimp!
Installation
1. What's your python version?
2. Thx for the compliments! :)
installation
#1 Python 2.5.2, works fine with your collect-layer and some other py-scripts
#2 my pleasure!
Installation prerequisites
You need the scipy package installed!
Download at: www.scipy.org
Its perfect, thank you.
Its perfect, thank you.
success with scipy
Excellent, that's it! Thx!