Hi, Stephen ..

On Nov 29, 2008, at 8:55 AM, hart@nasw.org wrote:

>> The second thing is that I have been trying to sneak up on the
>> foreground and background and refocus for each so I don't end up with
>> a fuzzy distance or foreground.
>>
>> Doug
>
> That's a whole 'nother algorithm, developed first, I think, at NASA
> for moon-rock photos. I believe that Photoshop CS4 has that
> capability (or some future version will).

Well, it looks like CS3 has got it already.

> (Earlier versions have high-dynamic-range stacking capability, and
> panorama stitching.) But you can also use software such as Helicon
> Focus and ImageJ (with the appropriate plugin). Um, there's another
> popular title that's Windows-only, but I don't have it on the tip
> of my tongue. Image stacking after eliminating out-of-focus areas
> is used in insect photography sometimes.

Naturally. There is always a bug in software.
>
> You'll know, Doug, that there are some problems that arise here. As
> you change focus, the geometry of the photo changes somewhat.
> Without thinking about it a bit, I don't know how this would affect
> landscapes, but it's a big issue in closeup photos. NASA had other
> software to correct the geometry of their lenses as they stitched.

Yeah. I expected that, but it doesn't seem to have showed up, and I
have viewed it a full size, which seems to be about a quarter mile
wide, and not found evidence of it. Maybe I just didn't try focusing
close enough. I think I'll try that sometime. Maybe in the Spring
when there are flowers for the foreground.

Well, I guess I"ll get off the OT now. Anybody still using Golive? I
haven't gotten into Dreamweaver yet. Waiting for something better to
come along. Oh, where, o where has my little app gone?

... Doug


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