I use a number of software packages for viewing and editing images, the most obvious being Photoshop. However, I’m also a big fan of Irfanview,  written by Irfan Skiljan of Jajce, Bosnia. The first version of Irfanview was released as long ago as 1996 and the current version is 4.3. This is a brilliant little program with a wealth of features. You can view and save a whole host of file formats as well as performing basic editing tasks such as resizing, cropping and sharpening. Not only thus but you can add plugin-in filters that allow you to edit colour curves and apply filters to your images. It even does batch-processing. Not only is this remarkable program very powerful, but it’s also free, although the author does suggest you might want to make a donation. The download is also very compact, at just 1.4MB!