One of the original goals of tone mapping was to be able to reproduce a given scene or image onto a display device such that the brightness sensation of the image to a human viewer closely matches the real-world brightness sensation. However, a perfect match for this problem is never possible and thus the output image on a display is often built from a tradeoff between different image features. Choosing between features is often based on the necessary application, and given appropriate metrics for the application, one possible solution is to treat the issue as an optimization problem.