This thesis explores relighting of a single photograph using a computer.
The method explored is a three step process. The first step attempts to reproduce the original illumination, which is then used to neutralize the illumination of the photograph. The modulated photograph now represent the texture of the scene.
After neutralization of the original lighting a new illumination is computed, and the final step modulates the texture photograph using this new illumination.
Input to the system is the geometry of the scene, and an High Dynamic Range(HDR)photo. The first step is processed using a global illumination simulation. This simulator can be in the form of a ray tracer or a radiosity solver. Several approaches to handling lighting is tried in this step.
Finally a new illumination is rendered using graphics hardware, and used to modulate the texture photo in real-time. The user can then interactively modify light-sources.