[mapserver-users] Rendering artefacts when serving raster via WMS

[Brent Fraser]

John,

It looks like a resampling problem.  You could try adding

	PROCESSING "OVERSAMPLE_RATIO=1"
	PROCESSING "LOAD_FULL_RES_IMAGE=NO"

to your layer definition.  I had some success with these when trying to 
get mapserver to render large (and readable) images from OpenStreetMap.

Best Regards,
Brent Fraser


On 6/15/2011 9:04 AM, Frank Warmerdam wrote:
> On 11-06-10 12:25 PM, John Westwood wrote:
>> Does anybody have any ideas what the problem could be? I know it is 
>> something
>> to do with the fact that I boosted the images and MapServer doesn't 
>> like them,
>> but I would like to fix it. Suggestions greatly appreciated.
>
> John,
>
> I'm afraid I don't have much to offer.  I just wanted you to know that
> someone had looked at your post and had no bright ideas about why it is
> happening.  If this is quite important to you, you could file a ticket
> on the issue, reducing it to a simple map file with one input GeoTIFF
> and a request (ideally with shp2img) that produces the artifacted output.
> Then I could dig into this from my end.
>
> If you do that, you can directly assign the MapServer ticket to 
> "warmerdam".
>
> Best regards,