From Lunarpages Web Hosting Wiki
The Image Manager allows you to view and modify images in your account. You can change the size of your images, convert their file type, or just view them with the Image Manager.
To access the Image Manager, log into cPanel, and scroll down to the Advanced section and click on the Image Manager icon. You will find the following options:
- Thumbnailer - Allows you to view a small (thumbnail sized) version of any images in a directory on your site.
- Image Scaler - Lets you to change the size of an image on your site.
- Convert Image Format (jpg,gif,bmp,etc) - Allows you to change the format of an image to another file type. Such as changing a .jpg to a .bmp.