davea at ieee.org
Fri Oct 16 05:15:02 CEST 2009
Anthra Norell wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Dylan
> Palmboom wrote:
>> Does anyone know what python libraries are available to do the
>> 1. I would like to take a photograph of an object with a colour. In this
>> case, it is a sheet of sponge.
>> 2. Feed this image into a function in a python library and let the
>> "automatically scan" this image's
>> pixel colours, and return an average of all the pixels' colours
>> in the
>> 3. I could then use the rgb values to set a colour swatch for the
>> Please let me know if you have any ideas. It would be appreciated.
>> In the meantime, I will search Google and see what I can find.
> image.histogram () returns a list of pixel counts: red: index 0 - 255,
> green: 256 - 511, blue: 512 - 767. Figure out the median for each
> color and there you go.
> This would obviously not work well with pictures containing a wide
> range of colors, such as a landscape, but then color-averaging a
> colorful picture wouldn't make much sense anyway. You seem to be
> working with uniformly colored objects for which the method should
> work well, as you'll get a narrow range of values with high counts in
> each color band.
You should look at PIL, the Python Imaging Library. Or if you're
writing a GUI program, there's undoubtedly a jpeg decoder built into
whatever library you're using. For example, if you're using wxPython,
you might want to look at wx.Image, and wx.JPEGHandler.
PIL -- http://www.pythonware.com/products/pil/
wxPython -- http://www.wxpython.org/
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