Nathan Wajsman wrote:
> I would not think so either (the aperture used was f11, BTW). Exposure was
> constant as well, except for one thing--I had left the camera on auto ISO, so
> it could be that ISO was changed from 160 to 320 for some of the images.
>
So we have a couple of possible causes. Further experiment may result in
technique without the problem. but what if I have taken a panorama that
is important to me and difficult, expensive, whatever, to recreate?
As usual, Moosie is interested in ways to correct image problems after
the fact. There is A solution to this problem, if not THE solution.
In the PS Photomerge function, there is an option to keep all the
separate images as layers, rather than flatten them. The layers then
have masks to reveal/conceal each other. Painting the masks with a soft,
large, low flow brush can pretty easily blend sky colors to give
seamless transitions. Without the sky clues, I don't think anyone would
notice anything in the sand, such as Chuck said he noticed.
In this particular panorama, there's one obvious awkward detail overlap
spot on the far right, just past the last buildings and cranes and just
above the right side of the yellow umbrella. It might work out well with
the same technique, but with smaller brush, or might need a bit of touch-up.
> I suspect that it might have been this, plus the natural change in the color
> of the sky as you rotate 360 degrees, that is responsible.
>
That doesn't seem right to me. The same spot in the sky should be the
same color/brightness whether viewed through the left or right side of
the lens. Assuming the images are taken reasonably quickly, there
shouldn't be changes at boundaries from this source. There are some
overall changes, not at boundaries, that I think are attributable to
this source.
I'm also interested in how the sky between buildings seems to have a
different brightness and gradient than elsewhere. That could be a result
of the Auto-ISO changing exposure where the building make subject
brightness lower.
Moose
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|