python生成透时图片and 写文字

import Image  
from get_png import getpng  
  
def transparent(infile):  
    #open png,covert it into 'RGBA mode',resize it,get data then make a datalist  
    datalist=list(Image.open(infile,'r').convert('RGBA').resize((1000,1000),Image.BILINEAR).getdata())  
    #color(0,0,0,0) is transparent  
    newim=Image.new("RGBA",(1000,1000),(0,0,0,0))  
    for x in range(1000):  
        for y in range(1000):  
            #color(255,255,255,255) is 'white'  
            if datalist[1000*y+x]==(255,255,255,255):  
                newim.putpixel((x,y),(255,255,255,255))  
            else:  
                pass  
    newim.save("1000_1000.png")  
    return "1000_1000.png"

以上生成了透明文件

import Image
import ImageDraw
import ImageFont

#增加水印.直接写入文件.
def watermask(qq_screencapture_file):
    print(qq_screencapture_file)
    #写入两行文件.
    sign_text1 = u'版权声明：本文为博主原创，未经允许不得转载。'
    sign_text2 = u'博主地址：http://www.www.www'
    #字体必须大于等于19才可以输出汉字，过小可能该库渲染不起来，具体原因不清楚。
    font = ImageFont.truetype('simhei.ttf',19)
    img = Image.open(qq_screencapture_file)
    #获得图片长和宽,将文字写到最底下.
    width,height = img.size
    #img = Image.new("RGBA",(300,200),(0,0,0))
    draw = ImageDraw.Draw(img)
    #draw.text( (0,50), u'你好,世界!', font=font)
    # draw.text( (0,50), unicode(txt,'UTF-8'))
    draw.text((20,height-50),sign_text1,fill='#ff0000', font=font)
    draw.text((20,height-30),sign_text2,fill='#ff0000', font=font)
    del draw
    #正好qq图片是png的.
    img.save(qq_screencapture_file, "PNG")
    print("finish.")

以上写入了文字