Image magick crop image 2, convert image to pdf

This command crop all image at size 720x1100 out of original mobile 720x1280 (vertical).
This often happen when you take screen shot in mobile device, it also show header of image like android status bar...
You also can enter fullscreen mode in mobile before take screenshot but it take time and u can't do in all situation.

for file in *.jpg; do convert -crop 720x1100+0+180 $file  $(basename $file .jpg)_croped.jpg; done

- for file in *.jpg: loop through all jpg file in current folder.
- convert : one of imagemagick command
- -crop (crop image)
- 720x1100: size to crop
- +0+180 : start position to crop: here i crop about 180pixels bellow header.
- basename : bash function to get name of filename (eg: extension .jpg)

after 

Convert image to PDF:
http://catlingmindswipe.blogspot.com/2013/11/how-to-convert-jpg-to-pdf-using.html
http://catlingmindswipe.blogspot.com/2013/11/how-to-convert-jpg-to-pdf-using.html
(Note: this task may be take time because if you have about 50MB of image to convert, your computer have heavy graphic task)

For crop video use ffmpeg follow this guide:
http://superuser.com/questions/510985/how-can-i-crop-a-video-to-a-part-of-the-view
or use this tool:
https://launchpad.net/~stebbins/+archive/ubuntu/handbrake-releases