[Numpy-discussion] get information/position of value from matrix

[ioannis syntychakis]

hallo, can anybody help me with this;

I think i have to post in this mail list because i think i have to use numpy
to do it.

I have a grayscale (L mode) image. On some places on the image i want to
calculate the average pixel value (i know how to do that).
But i want to let the user of the program choose the place! So i want that
the user get a square on his mouseclick en be able to select the square
where python has to calculate the averagepigelvalue.

any ideas how i would do this?

thanks in advance everybody

2010/4/8 Michael Gilbert <michael.s.gilbert at gmail.com>

> On Thu, 8 Apr 2010 09:06:16 +0200, ioannis syntychakis wrote:
> > thanks for all your answers.
> > Now i can get al the values above the 150, but i would also like to have
> > their positions in de matrix.
> >
> > excample:
> >
> > [[1. 4. 5. 6. 7. 1
> >   2. 5. 7. 8. 9. 3
> >   3. 5. 7. 1. 3. 7]]
> >
> > so, if i now look for values above the 8. the ouput should be; 1 value on
> > position (4,1) (beginnning from 0)
>
> a == 8
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