"To download and install, go to use System, Administration, Synaptic Package Manager. Type in your password when prompted. Click on Seach and type in nautilus-image-converter. Once it has been found, right click on it and select "Mark for Installation". Click Apply and wait for the download and installation. The file is only 279kB, so it won't take long.
"Once the installation is completed, using the Nautilus File Manager, you'll be able to right click on an image, select "Resize image..." or "Rotate image..." and do various thing to it. The most obvious being to resize or rotate images!"