drewes....@gmail.com wrote:

> I'm new to python and I have 30.000 pictures.
> I need to crop, let's say 100, parts of 256x256, randomly out of every
> picture.
> 
> I cant find an answer in the net, would be nice if someone could help me
> out!

You can walk over the files with

https://docs.python.org/dev/library/os.html#os.walk

find out the image size and process the image with pillow

http://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.size
http://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.crop

using

https://docs.python.org/dev/library/random.html

to determine what part of an image you want to pick.

Now write some code and come back here if you run into problems you cannot 
solve yourself.

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