Why use Python for image processing, if we could use WIMP (http://en.wikipedia.org/wiki/WIMP_(computing)) or WYSIWYG (http://en.wikipedia.org/wiki/WYSIWYG) to achieve the same goal? This is used because we want to create an automated system to process images in real time without human support, thus, optimizing the image pipeline.
Note that the PIL coordinate system assumes that the (0,0) coordinate is in the upper-left corner.
Image module has a useful class and instance methods to perform basic operations over a loaded image object (
im = Image.open(filename): This opens a file and loads the image into
im.crop(box): This crops the image inside the coordinates defined by
boxdefines left, ...