wwp@yahoogroups.com:
Re: Remapping leads to quality loss ?
Uri cogan 2005-Apr-05 06:39:00
>On 3 Apr 2005 at 3:03, Sven Hafner wrote:
>
>> A rather technical question regarding remapping from cube faces to
>> equirectangular image and back. Is it true that each time you convert
>> you are loosing quality ???
Erik Krause replied:
>It's true, although the degradation is minimal. It depends largely on
>the interpolator used. For a comparison of interpolators see:
><http://www.path.unimelb.edu.au/~dersch/interpolator/interpolator.html>http://www.path.unimelb.edu.au/~dersch/interpolator/interpolator.html
>But notice that these examples are after 36 interpolation steps...
I just too an equirectangular image (3800 x 1800 pixels) and
converted it to cube faces with Cubic Cnverter on a Mac. Then I
converted the faces back to a equirectangular image and repeated the
process 4 more times.
Surprisingly little degradation, practically invisible (to me) for
two generations, maybe three. I can't imagine what it will happen
after 36 iterations, but who needs that? - there are less tedious
ways to fuzzy up an image.
--
Uri Cogan
http://www.uricogan.com
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