[Geoserver-devel] [jira] (GEOS-5304) ImageMosaic OutputTransparentColor adds alpha channel to GetMap image

GeoServer GeoServer Developer
1

Felix LJ Mayer created BugGEOS-5304
ImageMosaic OutputTransparentColor adds alpha channel to GetMap image

Issue Type:

BugBug

Affects Versions:

2.1.1

Assignee:

Andrea Aime

Attachments:

4band0.tif, 4band1.tif

Components:

WMS

Created:

11/Sep/12 4:21 PM

Description:

Steps:

  1. Create a ImageMosaic store and layer with the attached 4-band images.
  2. View the layer in the Layer Preview.
  3. In the layer preview URL, replace ‘format=application/openlayers’ with ‘format=image/png’. You can also add ‘&TRANSPARENT=false’ to be sure.
  4. Refresh the URL and save the image, then run gdalinfo on it. It will report 4 bands. I don’t think it should, but I wrote GEOS-5303 for that.
  5. Add the ‘3band’ SLD below to GeoServer and change the GetMap request to include ‘&STYLES=3band’.
  6. Refresh the URL and save the image, then run gdalinfo on it. It will report 3 bands, i.e. the SLD works.
  7. Edit the layer to set BackgroundValues=255,61,210 and OutputTransparentColor=FF3DD2.
  8. Refresh the URL and save the image, then run gdalinfo on it. It will report 4 bands.

I don’t think OutputTransparentColor should add an alpha channel unless I specify ‘&TRANSPARENT=true’ in the request.

<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
  xmlns="http://www.opengis.net/sld"
  xmlns:ogc="http://www.opengis.net/ogc"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.opengis.net/sld
  http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd">
  <NamedLayer>
    <Name>3band</Name>
    <UserStyle>
      <FeatureTypeStyle>
        <Rule>
          <RasterSymbolizer>
            <ChannelSelection>
              <RedChannel>
                <SourceChannelName>1</SourceChannelName>
              </RedChannel>
              <GreenChannel>
                <SourceChannelName>2</SourceChannelName>
              </GreenChannel>
              <BlueChannel>
                <SourceChannelName>3</SourceChannelName>
              </BlueChannel>
            </ChannelSelection>
          </RasterSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

Project:

GeoServer

Priority:

MajorMajor

Reporter:

Felix LJ Mayer
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