image_trans 图像去黑色背景

image_trans.py

# -*- coding: utf-8 -*-
# !/usr/bin/env python

import sys
from PIL import Image, ImageDraw

file_name = sys.argv[1]

def binarizing(img,threshold): # input: gray image
    pixdata = img.load()
    w, h = img.size
    for y in range(h):
        for x in range(w):
            if pixdata[x, y] > threshold:
                pixdata[x, y] = 0
            else:
                pixdata[x, y] = 255
    return img

def main():  
    image = Image.open(file_name)  
    image = image.convert("L")   
    binarizing(image, 30)  
    image.save("trans_"+file_name)  

if __name__ == '__main__':  
    main()