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I need help, please. I'm trying to select and crop the overlapping area of two images with the Python Pillow library.

I have the upper-left pixel coordinate of the two pictures. With these, I can find out which one is located above the other.

I wrote a function, taking two images as arguments:

def function(img1, img2):
    x1 = 223 #x coordinate of the first image
    y1 = 197 #y coordinate of the first image
    x2 = 255 #x coordinate of the second image
    y2 = 197 #y coordinate of the second image

    dX = x1 - x2
    dY = y1 - y2

    if y1 <= y2: #if the first image is above the other
        upper = img1
        lower = img2
        flag = False
    else:
        upper = img2
        lower = img1
        flag = True

    if dX <= 0: #if the lower image is on the left
        box = (abs(dX), abs(dY), upper.size[0], upper.size[1])
        a = upper.crop(box)
        box = (0, 0, upper.size[0] - abs(dX), upper.size[1] - abs(dY))
        b = lower.crop(box)
    else:
        box = (0, abs(dY), lower.size[0] - abs(dX), upper.size[1])
        a = upper.crop(box)
        box = (abs(dX), 0, lower.size[0], upper.size[1] - abs(dY))
        b = lower.crop(box)

    if flag:
        return b,a #switch the two images again
    else:
        return a,b

I know for sure that the result is wrong (It's a school assignment). Thanks for your help.

Amedeo Di Gaetano
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1 Answers1

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First of all, I don't quite get what do you mean by one picture being "above" the other (shouldn't that be a z-position?), but take a look at this: How to make rect from the intersection of two? , the first answer might be a good lead. :)

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bitworks
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  • I'm sorry, I can't write English very well. By "above" I meant overlap. I'm working on a two dimensional ground, but I need to use pillow. Also, thanks for your answer but I need the coordinates of the two opposing vertices of the two selected rectangles – Amedeo Di Gaetano Sep 14 '16 at 10:05