Hey again,<br><br>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.<br><br>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.<br>
<br>Thanks,<br><br>Jason<br><br><div class="gmail_quote">On Mon, Mar 15, 2010 at 3:55 PM, Robert Sanson <span dir="ltr"><<a href="mailto:SansonR@asurequality.com">SansonR@asurequality.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<div>Hi Jason</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>regards,</div>
<div><br>Robert<br><br>>>> Jason Beverage <<a href="mailto:jasonbeverage@gmail.com" target="_blank">jasonbeverage@gmail.com</a>> 16/03/2010 4:53 a.m. >>><div><div></div><div class="h5"><br>Hi all,<br>
<br>I have some imagery that is in UTM that contains an alpha band that<br>masks out areas with no data. When I use MapServer to reproject it to<br>epsg:4326, the masked out area looks good if I set RESAMPLE=NEAREST on<br>
the layer. If I change the RESAMPLE option to BILINEAR or AVERAGE I<br>get black splotches in the area that is transparent.<br><br>Has anyone else seen this behavior?<br><br>I'm using MapServer 5.6.1<br><br>Thanks,<br>
<br>Jason<br></div></div>_______________________________________________<br>mapserver-users mailing list<br><a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/mailman/listinfo/mapserver" target="_blank">http://lists.osgeo.org/mailman/listinfo/mapserver</a>-users<br>
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