#! /usr/bin/python

from PIL import Image
import Image, ImageTk, ImageDraw
import sys
import os



def PixelGood(pixel, threshold):
	return (pixel[1] > (pixel[0] + pixel[2]) and pixel[1] > threshold)


def rect_size(e):
	return (e[3] - e[1]) * (e[2] - e[0])

def GreyScale(pixel):
	greyscale = 0
	for i in range(0, len(pixel)):
		greyscale += pixel[i]
	greyscale = greyscale / len(pixel)
	return greyscale

def Process(threshold):
	
	xMin = image.size[0]
	xMax = 0
	yMin = image.size[1]
	yMax = 0

	for x in range(0, image.size[0]):
		for y in range(0, image.size[1]):
			if (PixelGood(pix[x, y], threshold)):
				if (x < xMin):
					xMin = x
				if (x > xMax):
					xMax = x
				if (y < yMin):
					yMin = y
				if (y > yMax):
					yMax = y

	test = Image.new("RGB", (xMax - xMin + 1, yMax - yMin + 1), "white")
	draw = ImageDraw.Draw(test)

	for x in range(xMin, xMax):
		for y in range(yMin, yMax):
			if (PixelGood(pix[x, y], threshold)):
				draw.rectangle([x-xMin, y-yMin, x-xMin, y-yMin], "black")
			else:
				draw.rectangle([x-xMin, y-yMin, x-xMin, y-yMin], "white")

	#test.show()
	#test.resize([test.size[0]*2, test.size[1]*2]).save(output_file)
	test.save(output_file)
	#os.system("convert " + str(output_file) + " -resize 40% " + str(output_file))
	sys.exit(0)



if (len(sys.argv) != 3):
	print("Usage " + str(sys.argv[0]) + " input output")

input_file = sys.argv[1]
output_file = sys.argv[2]

image = Image.open(input_file)

pix = image.load()

# This displays all good pixels in the image; testing



Process(80)