With Photoscape you have a complete set of utilities for photographic edition, it includes from conversion among formats (it supports RAW) till the creation of photomontage.
It includes a graphic visualizer and different controls to define brightness values, color saturation, contrast and more. You may correct the annoying red-eye effect and apply a series of filters, masks and effects to "play" with your pictures.
An interesting characteristic this powerful photo editor offers is the capacity of applying modifications over image groups, which will facilitate, for example, to rename or re-dimension multiple graphic files.