Originally posted by: fuzzybabybunny
Originally posted by: Looney
What do you mean you used 2 images?
In a lot of scenics the camera's sensor physically can't record the drastic differences in light and dark areas of the scene. Like the picture Odin posted, if he only made one shot that shot would have:
1. Had the sky filled with detail, but the darker ground would have been way too dark and featureless.
OR
2. Had the dark areas full of detail, but the sky would have been completely blown out and too bright, making it featureless.
Blending two pictures, one exposed for the highlights and one exposed for the darker areas, and selectively blending them together (#1 + #2) , lets you have the bright areas and dark areas filled with detail in the same picture.