曾经很想有这样一个 app，它可以将微博上用户的微博用图片的形式自动保存起来，留此存照。前几个月的那段时间，微博上很 网页截屏的基本原理就是通过取得 webkit 渲染（render）的数据来生成图片的，我经过一段时间研究，找到了两个方法来解决这个问题。
两个工具都不错，个人比较喜欢使用 cutycapt 这个工具，它是直接提供一个命令行来生成网页截图的，而前者是通过 javascript 来调用底层 webkit 接品 (page.render 方法) 来实现的，两者的侧重点不一样。 并且 cutycapt 是将整个网截下来，phantomjs 是将浏览器当前视区的一屏截下来。
Cutycapt 的用法如下
qichunren@qichunren-desktop:~/github/cutycapt/CutyCapt$ ./CutyCapt
-----------------------------------------------------------------------------
Usage: CutyCapt --url=http://www.example.org/ --out=localfile.png
-----------------------------------------------------------------------------
--help Print this help page and exit
--url=<url> The URL to capture (http:...|file:...|...)
--out=<path> The target file (.png|pdf|ps|svg|jpeg|...)
--out-format=<f> Like extension in --out, overrides heuristic
--min-width=<int> Minimal width for the image (default: 800)
--min-height=<int> Minimal height for the image (default: 600)
--max-wait=<ms> Don't wait more than (default: 90000, inf: 0)
--delay=<ms> After successful load, wait (default: 0)
--user-style-path=<path> Location of user style sheet file, if any
--user-style-string=<css> User style rules specified as text
--header=<name>:<value> request header; repeatable; some can't be set
--method=<get|post|put> Specifies the request method (default: get)
--body-string=<string> Unencoded request body (default: none)
--body-base64=<base64> Base64-encoded request body (default: none)
--app-name=<name> appName used in User-Agent; default is none
--app-version=<version> appVers used in User-Agent; default is none
--user-agent=<string> Override the User-Agent header Qt would set
--javascript=<on|off> JavaScript execution (default: on)
--java=<on|off> Java execution (default: unknown)
--plugins=<on|off> Plugin execution (default: unknown)
--private-browsing=<on|off> Private browsing (default: unknown)
--auto-load-images=<on|off> Automatic image loading (default: on)
--js-can-open-windows=<on|off> Script can open windows? (default: unknown)
--js-can-access-clipboard=<on|off> Script clipboard privs (default: unknown)
--print-backgrounds=<on|off> Backgrounds in PDF/PS output (default: off)
--zoom-factor=<float> Page zoom factor (default: no zooming)
--zoom-text-only=<on|off> Whether to zoom only the text (default: off)
--http-proxy=<url> Address for HTTP proxy server (default: none)
-----------------------------------------------------------------------------
<f> is svg,ps,pdf,itext,html,rtree,png,jpeg,mng,tiff,gif,bmp,ppm,xbm,xpm
-----------------------------------------------------------------------------
http://cutycapt.sf.net - (c) 2003-2010 Bjoern Hoehrmann - bjoern@hoehrmann.de
qichunren@qichunren-desktop:~/github/cutycapt/CutyCapt$
phantomjs 截屏的用法如下：
qichunren@qichunren-desktop:~/github$ cd phantomjs/
qichunren@qichunren-desktop:~/github/phantomjs$ ls
bin ChangeLog ff.png iteye.png Makefile python src
capture.js examples hello.png LICENSE.BSD phantomjs.pro README.md
qichunren@qichunren-desktop:~/github/phantomjs$ ./bin/phantomjs examples/rasterize.js
Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat]
paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"
qichunren@qichunren-desktop:~/github/phantomjs$ ./bin/phantomjs examples/rasterize.js http://www.iteye.com iteye.png
qichunren@qichunren-desktop:~/github/phantomjs$