wwp@yahoogroups.com:
Re: More on the scanning thing
Mike Morper 2004-Sep-26 16:40:00
Oops! My bad...
I just reread the message I sent last night... I was incorrect in the
ratio I noted below. A cylinder panoramic image needs to be not only
divisible by 96 horizontally, but by 4 vertically. So, the REAL ratio
is 96:4. Sorry for the confusion. Now back to your regularly scheduled
program. Note to self: no more emails after 10pm ;)
Bond,
There is no steadfast rule (that I am familiar with) when it comes to
stitching. Based on your description, it sounds like you shot your
images with the camera in a landscape orientation. If that is the case,
you're going to have about 25% overlap in your image pairs--keep that
in mind. Is that bad? No, you're OK.
What matters however, is your target output. If your vertical dimension
(scanned) is 420 pixels at 72 dpi, your final stitched output most
likely will be less than that. Why? Inevitably, you will have some
cropping to do over the stitched length of the composited image. So, if
you only want your cylinder-based image to be ~400 pixels high, then
scan around 420. My recommendation is to scan high, then sample down in
Photoshop (or whatever app you have) then create your pano from that
resulting file. Heck, you might decide that you like the image and want
to get it printed. I don't need to tell you what a 400 pixel tall image
(at 72 dpi) will look like printed. Instead, work in a high resolution
-- assume you want to print the image at 240 dpi.
The important thing to keep in mind is that the length the image must
be a ratio of 1:96. Otherwise, the two ends of the image will not wrap
correctly.
Hopefully this helps a bit...
Good luck!
PS - Here is a pano I did of the Golden Gate Bridge from the south
bluffs a few years ago. I never got around to cleaning this one up (so
banding in the overlapping images, etc).
http://homepage.mac.com/morps/site/photography/panoramic/ggbridge/
index.htm (300 pixels tall by the way)
On Sep 25, 2004, at 7:42 PM, E. Bond Francisco wrote:
>
> Hello everyone,
>
> A little more detail on the scanning question I asked earlier. I took a
> series of 12 photos -- 30 degrees each -- for a pano of the Golden Gate
> Bridge from the Marin Headlands. I was using an old old old Canon F1.
> Lens is a 50MM 1:1.8 lens.
>
> Now I have to scan them so I can stitch them together. I'm gonna use
> Photoshop CS to do this. If this were a standard shot for display on a
> computer screen, I'd be scanning to fit an average screen size of
> 800X600. Leaving some room for tool bars and menu headers, and the
> overage of most browser windows, I'd be scanning for a size of about
> 660X420 at 72 resolution.
>
> But somehow I get the feeling that this panoramic stuff doesn't
> necessarily go by those kinds of parameters. Any clues? What should I
> be using?
>
> Thanks,
>
> Bond
>
>
>
>
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