On Fri, Jul 15, 2011 at 11:42 AM, robert rottermann <rob...@redcor.ch>wrote:
> **
> On 15.07.2011 17:56, Benjamin Root wrote:
>
>
>
> On Fri, Jul 15, 2011 at 10:49 AM, robert <rob...@redcor.ch> wrote:
>
>> Hi there,
>> I am all new to mathlib world..
>>
>> What I try to do is plotting some charts over an image.
>> I would be very grateful, if somebody could provide me with an example.
>> thanks
>> robert
>>
>>
> Welcome Robert,
>
> This is fairly straight-forward. If you have a image file, you can plot it
> like so:
>
> >>> import matplotlib.pyplot as plt
> >>> imData = plt.imread("foobar.png")
> >>> plt.imshow(imData)
>
> Now, the tricky issue is that the coordinate system for the plot may be a
> bit backwards than you might want for normal plotting. The (0, 0)
> coordinate will be in the upper-left instead of the lower-left. Plus, the
> axis limits will be in pixels. This may or may not be an issue depending on
> what you plan to plot on top of the image. And, of course, unless you are
> in interactive mode, you will need to do a "plt.show()" call when you are
> finished building the plot and want to display it to the screen.
>
> I hope this helps and let us know if you have any other questions!
> Ben Root
>
> thank a lot Ben,
> it feels really good when you get answers that fast ..
> one more question: can I as imData what dimensions it has?
>
> thanks
> robert
>
>
That is quite straight-forward:
>>> print imData.shape
matplotlib uses NumPy for its numerical data arrays. You might want to read
up on its documentation here:
http://docs.scipy.org/doc/numpy/user/
http://docs.scipy.org/doc/numpy/reference/
I hope this helps!
Ben Root
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