Hi Miles,
Often this is the result of using just about any sort of lossy compression,
at the border between data and nodata exists a band of "semi-nodata" that is
more or less black. It is very hard to get rid of, since it is a varying
shade of black and other colors resulting from the lossy compression
artifacts at the edge. We had a similar problem with overlapping MrSID
images, and solved it by first converting them to a lossless format (GeoTIFF
Uncompressed), then using the GDAL NearBlack program to "chew" away the
nearly black artifacts from the edges. I wrote a vb.net Wrapper for GDAL
program that does this all automatically, that in the end, creates nice Jpeg
YCbCr, GeoTiff, 3.25 minute, 4326 with overview tiles, ideal for creating
high resolution mosaics of very large (eg the USA) areas anywhere in the
world. This program is here:
http://rasternormalizer.codeplex.com/
Here it is in use on the OKMaps GeoServer site with the 2008 NAIP imagery
for Oklahoma:
http://ogi.state.ok.us/OGI/search.aspx?mapcenterlon=-97.060791015682&mapcenterlat=36.115940822346&mapscale=13&Layers=58d1fa5c-6eb4-4b95-9f42-69cd7277e15d%2Cbc2e120e-520e-40db-a915-60407d411a74%2C&maptype=OLMap
Roger
On Tue, Feb 15, 2011 at 11:33 PM, Simone Giannecchini <
simone.giannecch...@geo-solutions.it> wrote:
> Ciao Martin,
> as miles mentioned you need to fiddle with the inputtransparentcolor
> in order to make a certain color transparent in the source images.
> Notice that the images must share the same background color but from
> your sample it is not clear if this is the case.
> Can you share some more info on this dataset?
>
> Regards,
> Simone Giannecchini
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>
>
> On Tue, Feb 8, 2011 at 4:49 AM, Miles Jordan <miles.jor...@aad.gov.au>
> wrote:
> > Martin Amaris wrote:
> >> Hi, I have this raster layer, where there are some contiguous images.
> >>
> >> These images has a black or white border, like a filling color.
> >>
> >> In the image overlapping, these borders avoid the complete display of
> >> the images.
> >>
> >> Is there any way, via SLD style or ImageMosaic plugin, that allows
> >> make transparent these borders, or wipe them out?
> >>
> >> In this picture http://twitpic.com/3xi7q0, you can see what I mean
> >
> > Martin,
> >
> > I'm not a huge expert with this part of Geoserver, but as nobody else has
> answered, you may try reading
> http://docs.geoserver.org/stable/en/user/tutorials/image_mosaic_plugin/imagemosaic.htmland
> taking a look at the backgroundValues configuration option.
> >
> > Regards,
> >
> > Miles
> >
> >
> >
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