The Image Resizer is a very handy tool to quickly resize images. This tool is very lightweight, so you don't have to use a separate photo editor software.
The download of this tool is at http://www.bricelam.net/ImageResizer/.
If you run ImageResizerSetup-3.0.exe /? in a command prompt you get a nice dialog showing you all the possible options.
To install the image resizer silently you have to run this command:
ImageResizerSetup-3.0.exe /install /quiet /norestart
if you want to remover background so use this app
BeantwoordenVerwijderenBackground Remover