test_for_black_bar.py

# python test_for_black_bar.py 06da390c-606f-4adf-961d-444968ced5af_5.png debug/aeee37b5-28f6-4be7-af2e-9cafb763072f_3.png  $(ls -d -1 debug/* | sort -R | tail -n 1000)

from PIL import Image
import sys
import math

for _file in sys.argv[1:]:

    im = Image.open(_file).convert('L')


    #print im.format, im.size, im.mode

    px = im.load()


    left = px[15, 9]
    center = px[16,9]
    right = px[17,9]
    #print "left %s, center %s, right %s" % (left, center, right)

    # values are low (dark) to high (light) so a high, low, high sequence 
    # of pixels is what a line looks like

    # if left and right are within 10% 
    # AND
    # if center is 25% less than left and right
    # that looks like a line

    if 0.90 * right < left < 1.10 * right:
        if center < 0.75 * right:
            print "Possible 'joined' photo %s" % _file