[Image-SIG] grayscale image: find darkest pixel and delete lighter ones

[Eduardo Ismael]

Hi!
I wonder if it is possible to do something like the following with the Python Imaging library:

for pixel in image:
    get how close to black it is
register what would be the darkest shade found in the image
delete pixels lighter than the darkest.

I'm asking because I scanned a bunch of pages from a book to .jpg. The images are in grayscale, and some pages have tables with gray background "underneath" black text, and I wanted to get rid of the background.

Thanks,

Eduardo

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