Ciao Sabine,
as you noticed the XXXTransparentColor settings do not apply to "real"
data (float, double, 16bits etc...).

Wit the latest versions of GeoServer (2.8.x and on if my memory serves
me right) if you enable JAI-Ext there should be proper support for
nodata introduced, hence you simply have to make sure your data
reports nodata properly.

Maybe some sample data could help identifying this issue.

Regards,
Simone Giannecchini
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On Mon, Oct 24, 2016 at 6:14 PM, Sabine Ohlendorf
<sabine.ohlend...@gmx.de> wrote:
> Dear List,
>
> I am using Geoserver 2.7.5. I want to create a layer out of several geotiffs 
> so I created an imagemosaic. The geotiffs are 32bit tifs an I want to 
> colorize them using Geoserver Styles. The single tifs overlap at the edges 
> and partly have no data values there which appear in the mosaic. To avoid 
> that I wanted to set the "Input Transparent Color". But when setting a value 
> I get an Error:
>
> org.geotools.data.DataSourceException: Unable to create this mosaic
>         at 
> org.geotools.gce.imagemosaic.RasterLayerResponse.prepareResponse(RasterLayerResponse.java:1336)
>         at 
> org.geotools.gce.imagemosaic.RasterLayerResponse.processRequest(RasterLayerResponse.java:1226)
>         at 
> org.geotools.gce.imagemosaic.RasterLayerResponse.createResponse(RasterLayerResponse.java:1192)
>         at 
> org.geotools.gce.imagemosaic.RasterManager.read(RasterManager.java:1153)
>         at 
> org.geotools.gce.imagemosaic.ImageMosaicReader.read(ImageMosaicReader.java:874)
>         at 
> org.geotools.gce.imagemosaic.ImageMosaicReader.read(ImageMosaicReader.java:853)
>         at 
> org.geoserver.catalog.SingleGridCoverage2DReader.read(SingleGridCoverage2DReader.java:147)
>         at 
> org.geoserver.catalog.CoverageDimensionCustomizerReader.read(CoverageDimensionCustomizerReader.java:227)
>         at 
> org.geoserver.catalog.CoverageDimensionCustomizerReader.read(CoverageDimensionCustomizerReader.java:217)
>         at 
> org.geoserver.wms.featureinfo.RasterLayerIdentifier.identify(RasterLayerIdentifier.java:170)
>         at org.geoserver.wms.GetFeatureInfo.execute(GetFeatureInfo.java:78)
>         at org.geoserver.wms.GetFeatureInfo.run(GetFeatureInfo.java:44)
>         ... 107 more
> Caused by: java.lang.IllegalStateException: Unsupported data type.
>         at 
> org.geotools.image.ImageWorker.makeColorTransparent(ImageWorker.java:1848)
>         at 
> org.geotools.gce.imagemosaic.RasterLayerResponse.createBlankResponse(RasterLayerResponse.java:1675)
>         at 
> org.geotools.gce.imagemosaic.RasterLayerResponse.prepareResponse(RasterLayerResponse.java:1333)
>         ... 118 more
>
> It seems it is not possible to set the InputTransparentColor for 32bit images 
> which seems logical. But how can I get a similar setting for 32bit images?
>
> Regards,
> Sabine
>
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