This plugin will resize big images to a smaller size and remove the original image after resizing it to save diskspace.
This plugin let's you upload images to the gallery. It will resize to big images and remove the original by default. It will also convert BMP files to JPEG file formats to save disk space.
You can configure the settings under "Media -> Image handler". Here you can set the default values for the resizing and converting to BMP. On the media upload page you can select if the original needs to be resized or not, this will temporarly override the default setting. This is the long description. No limit, and you can use Markdown (as well as in the following sections).