John Mitchell wrote:
Frank,
The ECW is already in a compressed format, so this means that the image
is compressed another 95%? This additional compression is for
performance purposes?; does it affect the image quality?
John,
The imagery is decompressed within mapserver for rendering purposes, and
then (if output is to ecw) re-compressed. So the 95% is relative to
uncompressed form, not cumulative. Even if the original image was
at 95% compression the process of decompressing and recompressing can result
in additional image damage.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, [EMAIL PROTECTED]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | President OSGeo, http://osgeo.org
