WMS using ecw file

[Gareth Heinz]

Hi all,

Serving a satellite image ECW (approx 4GB file) as a MapServer CGI consumable. While a 24bit PNG looks great, the filesize can be quite huge, therefore I've modified to serve it as a JPEG with QUALITY set to 100. This still looks good and gives a very small filesize compared to the PNG. 

Now here is the main question, when serving the same layer as a WMS service, the JPG looks really washed-out, where as the PNG while looking great has too big a filesize for the end-users. So I was wondering if there was a bug with Mapserver or GDAL (as I take it MapServer uses GDAL to serve ECW's), or if anyone out there has a solution? 

Using MapServer 4.8.3 on Windows 2003 serving via IIS. 

TiA.
Gareth
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