Forum : Photosynth Lounge

Photogrammetric, Oblique Image Stitching, Pets Dressed in Clothes Photos… this is a place to chat and share stories with your fellow Photosynthers. Not all topics have to be about photography, this is a place to relax and chat about whatever you fancy.


Topic: A few quetions...

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drh681 (Over 1 year ago)
Is there an "ideal" file size for a synth?

The pano stack I uploaded was full size jpegs from my Canon 20D

I get the idea that the bigger the files, the more you can zoom into the image.

Is more small files better than fewer large files?

and lastly, in terms of lay-out and movement; can I generate something like a diverging path? 
Say move along a bridge then turn left and right in the same synth and continue the move in either direction?
drh681 (Over 1 year ago)
oops...

sorry I meant an "ideal" file size for the individual images that make up the synth.
TonyErnst (Over 1 year ago)
drh681 - First off Photosynth will handle the diverging path with no problem (assuming of course you take enough photos with overlap, etc).  Check out overhead view on this synth for an idea of what's possible: http://photosynth.net/view.aspx?cid=0473fc18-8c4d-405f-854c-ce245c678816

As far is the images, the only real ideal is that they be at least 3MP.  Like you said youll be able to zoom in more with a larger initial photo, but you can duplicate this effect to some degree by just walking closer to something you think people would want to zoom in on and taking a close up shot.  This way you can get all the detail you want.
drh681 (Over 1 year ago)
Thanks, that opens some interesting ideas.
drh681 (Over 1 year ago)
Another thing or two, what about orientation?
Should the images be rotated to their correct "up" before the synth is generated?
it appears some synths have both vertical and horizontal images.

and I gather from a failed synth, that sharpness is essential to genreating a synth.
swami_worldtraveler (Over 1 year ago)
As far as I know, for synthing, image orientation does not matter, but if you want the images to appear correctly in Grid View (i.e. the 2D gallery mode), make sure they are properly oriented. I do this in Windows Explorer, since some viewers will read the EXIF orientation meta data and display the images upright w/o actually adjusting the file.

As for synthing, sharp images w/ lots of texture (patterns, etc.) and at least 3MP big work best.
Nathanael (Over 1 year ago)
Photosynth will attempt to display photos right side up if uploaded sideways but this is mainly an 'majority rules' type thing. If Photosynth finds the same image features in a bunch of photos and most of them are already right side up, then the photos in which those image features appear at a different angle are assumed to be taken at an angle other than level and displayed as such. The synth's 'up' is just an average of all the 'up's of the photos in that cluster of the synth.

That being said, both the Photosynth Photography Guide and the 'How to Synth' video mention rotating images right side up before uploading.

Something else that you haven't asked about but which is important to me is adding the photographer's name to the photos' 'Author' or 'Photographer' metadata field before you upload them to Photosynth. Free programs like Microsoft Pro Photo Tools and Windows Live Photos Gallery can help you do this or even the lower pane in Vista + 7's Windows Explorer
drh681 (Over 1 year ago)
I upload the card through adobe Photoshop Bridge CS4 that is set to add my actual name to the meta data.
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