RE: PHOTO-3D digest 1481

[P3D <mol@xxxxxxxxxxxxxxxxxx>]

Maurice Smith: www.microscopy-uk.org.uk  :-


>>Anyone want to pass some comment on our 3-d stuff at:-
>>http://www.microscopy-uk.org.uk

>>Take a look and please take the time to let me know how we can improve 
>>things. The SEM section is nice!

Sam:-

>I just visited the site, and you definately have some interesting stuff. But
>there seems to be a few things that concerned me. First of all, you call
>several of these images " Holograms" whereas in this context they are stereo
>anaglyphs. Were these actually taken from holograms and converted? Secondly,
>quite a few did not want to converge properly. It seems the cyan sides are
>rather weak, leaving lots of ghosting when viewed through the red filter. I
>tried several different types of glasses, and it was the same in all of
>them. The " Hologram of an Ant " did work well and is spectacular, but " 3d
>Crystals" seems to have an alignment problem.
>I hope you work out the " Bugs ", as this site is definately one worth the
>visit.

Maurice:-

Thanks for taking a look and the feedback. I called some of the images 
Holograms because in fact they were *not* derived from stereo pairs. These 
were actually single frames subjected to a lump of a software called 'Double 
VIsion' which is normally used to combine stereo pairs into a single 
composite 3d Image. I cheated the software by using the same image for each 
right/left source image and by mis-aligning the reference point used to 
combine the two images. Theresult then produces a flat but projected image
somewhere in front of the surface of the monitor.

I agree with you re: the ghosting. The cyan does not work properly. It seems 
okay if the bifringement is kept very thin but otherwise becomes very 
visible. Not certain why this is. I think it is because of the conversion to
JPEG or GIF format from an original TIFF source. Their is a shift slightly in
the colour transition and this shade of blue seems to be sensitive to subtle 
shade change.

The misalignment in the crystals was due to early experimenting taking stereo 
pairs in a scanning Electron Microscope. Much improved technique with more 
recent images and some I'm about to load. Have also created some 3d SEM 
movies using different techniques which should be loaded shortly. 

The trouble with creating images on the web is that of keeping file size 
small. Original images lose a lot of impact through shrinking and 
re-processing.

Once again, thanks for the feedback. I am very interested in 3D and have 
therefore created a lot more material on our site using 3d techniques.
Perhaps you can take a look at our 3D Planet Scopers section which is 
completely in 3d and is about to benefit from 3D moving images on the pages 
themselves. It is very different in its concept and design... and I'm sure 
very controversial too :-)


regards,

Maurice.


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