Hi Jason
Well, ECW use wavelet compression, which is lossy, and data values can get
changed slightly.
regards,
Robert
>>> Jason Beverage 16/03/2010 10:27 a.m. >>>
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
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
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 16/03/2010 4:53 a.m. >>>
Hi all,
I have some imagery th
Jason Beverage wrote:
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
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 s
