用python简单处理图片（3）：添加水

from PIL import Image, ImageDraw,ImageFont
im = Image.open("d:/pic/lena.jpg").convert('RGBA')
txt=Image.new('RGBA', im.size, (0,0,0,0))
fnt=ImageFont.truetype("c:/Windows/fonts/Tahoma.ttf", 20)
d=ImageDraw.Draw(txt)
d.text((txt.size[0]-80,txt.size[1]-30), "cnBlogs",font=fnt, fill=(255,255,255,255))
out=Image.alpha_composite(im, txt)
out.show()

from PIL import Image
im = Image.open("d:/pic/lena.jpg")
mark=Image.open("d:/logo_small.gif")
layer=Image.new('RGBA', im.size, (0,0,0,0))
layer.paste(mark, (im.size[0]-150,im.size[1]-60))
out=Image.composite(layer,im,layer)
out.show()