The following is an unprocessed image straight from the camera, an image that has been balanced and brightness/contrast adjusted, and finally the image processed by a retinex filter. Note the dramatic effect of the retinex filter on the girl in the shadows of the doorway and the reflection on the window pane. Image processing by GIMP 2.2.7.

raw (52K) balanced (56K) retinex (77K)

Another example of the impact of retinex:

Original image scaled down to 300 pixels high Same image after default retinex high

CA 100Lee Ling