I will admit that it's probably a stretch to equate number of bits per
pixel with actual capability. However, any camera that delivers a raw
mode image is delivering a range that is at least one and possibly two
stop beyond what can be represented in a JPEG. I call that 9-10 stops.
Not nearly so automatic but PW Pro has provided specific support for
exposure composites for at least a couple of years.
Chuck Norcutt
Winsor Crosby wrote:
> You really can't make that jump. There are lots of things that prevent
> it. Just one example is digital noise. One of the criticisms of the
> Kodak SLR/N and SLR/C is the noise. The reason for the noise is that
> they have chosen a wide dynamic range curve for the camera and you find
> noise lurking in all the shadows. Most other makers use a curve that
> covers the noise with shadow reducing the dynamic range. Noise
> reduction can lower the noise floor a bit and extend the dynamic range.
> Thom Hogan did a careful comparison of various DSLRs that took Nikon
> lenses in his subscription journal and found they ranged from about 7
> stops to 8 1/2 stops with the widest being the Kodak.
>
> Interestingly the new Photoshop CS2 makes the merging of varying
> exposures of the same scene much easier, almost automatic with a tool
> called HDR Merge. Reichmann discusses it on his site. Ideally you
> bracket exposure with a number of shots and open them in HDR Merge and
> then it does the job quickly without help from you. Looks very cool.
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