You can use JPEGView to open and make changes to different types of pictures, such as: BMP, JPG, TIFF, TGA, GIF, CRW, PNG, RW2, CR2, DCR. This small utility is portable, which means you don’t have to install it in order to use it, you can just carry it around on an USB stick or drive (or CD/DVD).

Here are the key features:

• It has a very simple, clean design
• In order to maximize the space allocated to the picture, the buttons will hide automatically when idle
• Basic functions you’d expect from a picture viewer/editor: flip horizontally or vertically, rotate to any arbitrary angle, zoom out & in, cut, copy, paste, adjust color, contrast and sharpness, etc
• View a movie made out of the pictures contained in a folder
• Support for SSE2
• You can apply the changes in real time while you’re watching the pictures

Download JPEGView if you need a robust image viewer capable of doing basic edits to improve the quality of your pictures.