[Geoserver-devel] [jira] (GEOS-6213) Image Enhancement unable to sample from centre of raster

Wed, 04 Dec 2013 04:50:29 -0800

Issue Type: Bug Bug
Affects Versions: 2.4.0
Assignee: Andrea Aime
Attachments: gamma1.png, gamma2.png, gamma3.png
Components: CSS
Created: 04/Dec/13 6:46 AM
Description:

This issue was originally reported against CSS module where the problem was observed. It looks to be a wider reaching issue effecting the OpenLayer preview. As with any glitch this is going to be annoying to report, grab me on IRC if you need a hand reproducing this one.

Working with a very basic raster contrast enhancement:

  * {
     raster-channels: auto;
     raster-contrast-enhancement: none;
     raster-gamma: 0.5;
   }



Which produces:




<sld:RasterSymbolizer>
  <sld:ContrastEnhancement>
     <sld:GammaValue>0.5</sld:GammaValue>
  </sld:ContrastEnhancement>
</sld:RasterSymbolizer>






Tests:



1. Full image layer preview - works!

2. Zoom in one level - fail with no output

3. Zoom in to top left corner - works!



So it looks like we are running into an optimisation failure, as long the GetMap request includes the top left corner the expected output is produced. The moment that is off the screen we get nothing back.
Environment: OSX 10.9
Project: GeoServer
Priority: Major Major
Reporter: Jody Garnett
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