Japanify.py

#! /usr/bin/python
import Image

#Created by vvdr12
#Fully open license.  Have fun.
#change threshold value in 'def contrastpoints' for higher/lower line density.
#put a 'test.jpg' file in the same folder as the code.

#_functions______________________________________________

def contrastpoints(x,j,img):
	threshold=20
	contrast=[]
	i=0
	l2=1
	while l2==1:
			
		r1=img[i,j][0]
		b1=img[i,j][1]
		g1=img[i,j][2]
		ave1=((r1+b1+g1)/3)

		r2=img[(i+1),j][0]
		b2=img[(i+1),j][1]
		g2=img[(i+1),j][2]
		ave2=((r2+b2+g2)/3)
		
		r3=img[(i+2),j][0]
		b3=img[(i+2),j][1]
		g3=img[(i+2),j][2]
		ave3=((r3+b3+g3)/3)
		
		r4=img[(i+3),j][0]
		b4=img[(i+3),j][1]
		g4=img[(i+3),j][2]
		ave4=((r4+b4+g4)/3)

		if abs(ave2-ave1)>threshold:
			if abs(ave1-ave3)>(threshold/2):
				contrast.append(i)

		i=i+1		
		if i==(x-3):
			l2=0
	return contrast

#_Page_Setup____________________________________________

source = Image.open("test.jpg")
img = source.load()
print source.format
print source.size
print source.mode

x = source.size[0]
y = source.size[1]



#_______________________________________________________


i=0
j=0#set to 500 for short test run
k=0
l=0
m=0 #contrast func
l1=1
contrast=contrastpoints(x,j,img) #contrast func
print "\n", j, "/", y
while (l1==1):
	
	if len(contrast)>m: #contrast func
		if i>=contrast[m]:
			img[i,j]=(0,0,0)
			m=m+1
	
	i=i+1
	if i==(x-1):
		contrast=contrastpoints(x,j,img) #contrast func
		m=0 #contrast func
		i=0

		k=k+1
		if k==1:
			k=0

			j=j+1
			print j, "/",y		
			if j==y: #set to 510 for short test run
				l1=0
			

	
source.save("japanify.png")