News123, 03.03.2010 01:38:
I created a grayscale image with PIL.

Now I would like to write a C function, which reads a;most all pixels
and will modify a few of them.

My current approach is:
- transform the image to a string()
- create a byte array huge enough to contain the resulting image
- call my c_function, which copies over the entire image in order
    to modify a few pixels
How can I achieve this with the least amount of copies?

Take a look at Cython instead, it will allow you to access PIL's image buffer directly, instead of copying the data. It will also simplify and speed up your C wrapper code.

Stefan

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