wartermark your image
《Windows网络程序设计》考试在几天前就结束了，第一次在试卷上写代码写到手痛，只能说考试很水很恶心！最近翻了一下zsh的文档，突然想自己写一个shell来玩一下，结果写了一点基本的东西（只完成了执行进程和信号控制）就写不下去了，总想着添加接口的问题，于是又去看lua(已是第二次!)、翻云风大神的Blog（很多都是看不懂的），决定还是应该深入了解一下lua。这些都是题外话，与主题无关！wheel...在这里图片在blog中是没有水印的，今天特意用python的PIL模块写了一个简陋的添加水印的脚本。PIL模块在很久之前就用过了，不过当时是拿来生成验证码，;-D。。。对于简单的图像处理来说，PIL足以应付了(虽然我更喜欢opencv ;))，只能感叹一下python的模块真的很管用！
用PIL生成水印图像很简单，把你的水印添加到源图像来生成目标图像，一个简单例子：
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
import Image
source_img = Image.open('source.png')
logo_img = Image.open('logo.png') # 要保证你的logo是透明的哟。。。废话！
source_img.paste(logo_img, (source_img.size[0] - logo_img.size[0],
source_img.size[1] - logo_img.size[1]), logo_img)
source_img.save('target.png', 'PNG')
看看效果：
这是源图像：
要添加的logo：
添加图像水印后：
还不错，继续pythonic，添加文字水印，也比较简单：
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
from PIL import Image, ImageDraw, ImageFont
TEXT_FONT = "/home/lazymonkey/.fonts/Fabada-regular.ttf" # 规定所使用的字体
FONT_SIZE = 14 # 设置14号字体
img = Image.open('source.png')
text = 'Hello world!'
watermark = Image.new("RGBA", (img.size[0], img.size[1]))
draw = ImageDraw.ImageDraw(watermark, "RGBA")
font = ImageFont.truetype(TEXT_FONT, FONT_SIZE)
draw.setfont(font)
draw.text((480, 560), text, 'Red')
img.paste(watermark, None, watermark)
img.save('target.png', 'PNG')
看看效果：
ok，封装一下：
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
'''
# {/ ． ．\}
# ( (oo) )
#+--------------oOOo---︶︶︶︶---oOOo------------------+
# FileName : wartermark.py
# Describe : take wartermark to your image
# Author : Lazy.monkey™
# Email : lazymonkey.me@gmail.com
# HomePage : lazymonkey.is-programmer.com
# Version : 0.0.1
# LastChange: 2012-05-21 15:57:55
#+------------------------------------Oooo--------------+
'''
'''
Notes : 0. 请设定输出为png图片格式，以得到最佳效果
1. 请设定字体为你系统内的字体
Usages: 0. python watermark.py source_img -l 'yourlogo' target_img
1. python watermark.py source_img -t 'text you want' target_img
'''
from PIL import Image, ImageDraw, ImageFont
from math import atan, degrees
import sys
import os
TEXT_FONT = "/home/lazymonkey/.fonts/Fabada-regular.ttf" # 规定所使用的字体
ALPHA = True
def usage():
if len(sys.argv) != 5:
sys.exit("Usage: %s <options> <intput-image <text or logo> <output-image>"
% os.path.basename(sys.argv[0]))
def logo4mark(filename, logo, outfilename):
img = Image.open(filename)
logo_img = Image.open(logo) # 要保证你的logo是透明的哟。。。废话！
img.paste(logo_img, (img.size[0] - logo_img.size[0],
img.size[1] - logo_img.size[1]), logo_img)
img.save(outfilename)
def text4mark(filename, text, outfilename):
img = Image.open(filename).convert("RGB")
watermark = Image.new("RGBA", (img.size[0], img.size[1]))
draw = ImageDraw.ImageDraw(watermark, "RGBA")
font_size = 0
##
# @brief 得到最佳字体大小
while True:
font_size += 1
nextfont = ImageFont.truetype(TEXT_FONT, font_size)
nexttextwidth, nexttextheight = nextfont.getsize(text)
if nexttextwidth+nexttextheight/3 > watermark.size[0]:
break
font = nextfont
textwidth, textheight = nexttextwidth, nexttextheight
draw.setfont(font)
draw.text(((watermark.size[0]-textwidth)/2,
(watermark.size[1]-textheight)/2), text)
watermark = watermark.rotate(degrees(atan(float(img.size[1])/
img.size[0])),
Image.BICUBIC)
if ALPHA is True: # 水印透明
mask = watermark.convert("L").point(lambda x: min(x, 55))
watermark.putalpha(mask)
img.paste(watermark, None, watermark)
img.save(outfilename)
if __name__ == "__main__":
usage()
if sys.argv[1] == '-l':
logo4mark(*sys.argv[2:])
if sys.argv[1] == '-t':
text4mark(*sys.argv[2:])
看看透明文字水印的效果：
2012年5月21日 19:23
为什么不试试 ImageMagick 呢？一行命令就能够解决哦亲～
2012年5月21日 20:27
@依云: 果然，你赢了。。。我这是没事瞎折腾啊！重复造轮子咯。。。:(
2012年5月21日 20:38
@lazymonkey: 喂，你就再去折腾下 ImageMagick 嘛，然后把最终的命令贴出来 ^_^
2012年5月21日 20:47
@依云: 呃。。。ImageMagick做水印已经有人写了，我没机会啊！:-D http://tuxtweaks.com/2009/08/howto-watermark-images-imagemagick-linux/
2012年5月21日 21:24
@lazymonkey: Thanks! 有时间研究下。
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