XDR imaging stand for “Extended Dynamic Range”. It is very similar to HDR imaging, but with a notable difference. In XDR, you take a single exposure of the scene, and process it over and under proper exposure in Photoshop or a similar program, adjusting your exposure at different levels. You then take these multiple copies of the original photo, and merge them to achieve an extended range of tones in the final image.
Using XDR techniques, you can take a fairly bland photo, and “tweak” it using the same options as with HDR. You won’t get the same range in XDR as you will in HDR. But using only a single exposure of the scene, you eliminate alot of “softness” and “wobble” that accompanies many true HDR images.
Here is an example of an XDR image, using a single exposure, and 2 processed copies of that exposure…one over one under:
You can see that this image does not have quite the surreal range as a true HDR image, but is still well extended beyond the possibilities of a single exposure. It is also quite sharp and distinct, since each layer is an exact copy of the original, save for brightness compensation.