Hey again, Some more information, the file I was using was an ECW I converted from a tif. The black splotches appear if I use the ECW, but if I use the original tif file I don't see them.
However, when using AVERAGE or BILINEAR, it appears as if the alpha values are either completely transparent or completely opaque. The image I'm using is an image I used the gdalwarp -cblend option on to do some polygon cutting so I'm losing my blending line if I do average or bilinear resampling. I'll see if I can create a small example that shows the issue. Thanks, Jason On Mon, Mar 15, 2010 at 3:55 PM, Robert Sanson <[email protected]>wrote: > Hi Jason > > That's not unexpected. RESAMPLE=NEAREST preserves the "nodata" vales used > in the mask. BILINEAR or AVERAGE combine values from adjoining pixels, so > the "nodata" pixels get some other value. > > regards, > > Robert > > >>> Jason Beverage <[email protected]> 16/03/2010 4:53 a.m. >>> > > Hi all, > > I have some imagery that is in UTM that contains an alpha band that > masks out areas with no data. When I use MapServer to reproject it to > epsg:4326, the masked out area looks good if I set RESAMPLE=NEAREST on > the layer. If I change the RESAMPLE option to BILINEAR or AVERAGE I > get black splotches in the area that is transparent. > > Has anyone else seen this behavior? > > I'm using MapServer 5.6.1 > > Thanks, > > Jason > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > > > > ------------------------------------------------------------------ > > The contents of this email are confidential to AsureQuality. If you have > received this communication in error please notify the sender immediately and > delete the message and any attachments. The opinions expressed in this email > are not necessarily those of AsureQuality. This message has been scanned for > known viruses before delivery. AsureQuality supports the Unsolicited > Electronic Messages Act 2007. If you do not wish to receive similar > communications in future, please notify the sender of this message. > ------------------------------------------------------------------ > > This message has been scanned for malware by SurfControl plc. > www.surfcontrol.com >
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