[OpenLayers-Users] Image layer on top of OSM

[Phil Scadden]

you are correct - if you are going to overlay images, then they must be 
on the same projection. Re-projecting an image on the fly is costly (and 
degrades the image quality), and beyond what a browser running JS can do 
in reasonable time. Geoserver can do on-the-fly reprojection of image 
sources but that doesnt solve image quality issues (and is expensive on 
server cpu resources). You want to look hard at how the image was 
created in the first place. If it is photographic or similar, then 
offline reprojection to 900913 using high-quality (cpu-intensive) 
options is best path. If it originated from vector data, then go back to 
the original vector data and use a WMS server to deliver it in the 
desired projection on the fly.

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