https://github.com/cybertk/android-fb2png
http://blog.youkuaiyun.com/qq_28992301/article/details/52727342
http://blog.youkuaiyun.com/sinc00/article/details/44979923
Device Side
Download prebuilt version fb2png from here: http://code.google.com/p/android-fb2png/downloads/
Push to device/emulator and grant execute permission
adb push fb2png /data/local/
adb shell chmod 755 /data/local/fb2png
Capture screen and save to /data/local/fbdump.png
adb shell /data/local/fb2png /data/local/fbdump.png
Pull the screenshot back
adb pull /data/local/fbdump.png
Then you can view it with your favorite image viewer