Sometime around 11/1/08 (at 19:47 +0100) Hans Nyberg said:
With CubicConverter choose 50% jpg compression. At 45 you begin
to get banding
With Pano2VR the same setting is 70%
This is a very good point, well worth noting:
The JPEG compression levels found in different applications are not
done to the same scale. It is very misleading, for example, to try
to assess images for quality when they've been output at the 'same'
compression setting (i.e. same number/percentage) from two
different applications.
The best way to do this kind of comparison is to output files with
different compression settings and compare file sizes. When you
have effectively same-size documents (allowing for embedded icons,
etc.) THEN you can make quality comparisons. Well, you're closer to
that point anyway. Not that all JPEG compressors are equal under
the hood either, so all comparisons should be done with care.
But the point is (says Keith, dragging himself back on-point) that
one app's JPEG compression value is not the same as another's. I've
seen people mess up images through this assumption.
I have complained about this for the last 4-5 years. First Panocube
and then Pano2QTVR.
Now it is even a larger problem as we now also have Pano2VR for Mac.
As far as I know RealViz uses the same standard as we always had on
Mac also for Windows.
And as this standard is very close to Photoshop save for web it
should be the one which should be used.
Hans
Hans Nyberg
Panoramas.dk<http://www.panoramas.dk> Features Fullscreen QTVR from
the best VR Photographers
email: email@hidden
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