Hi,
Yes, there is a contrast enhancement option that can be used in SLD but I suggest to include a ready-made ”contrast_enhancement.sld” and add it to styles which are shipped in data_dir/styles so that users could apply it to the dark image layers from the GUI. We ship now the default “raster.sld” and two slds for colouring rasters “rain.sld” and “dem.sld” but they do not have elements for contrast enhancement. Configuration of Geoserver is mostly done from GUI and users appreciate it but compared to that the step to start writing SLD files by hand is big.
Why do we have Coverage Band Details in layer settings? The min-max values showed for a raster do not seem to be right and I guess that they are not meant to be edited for doing LUT stretch.
-Jukka-
···
Jody Garnett wrote:
I thought there was a contrast enhancement option already in SLD?
Jody Garnett
On Wed, Oct 1, 2014 at 2:45 PM, Rahkonen Jukka (Tike) <jukka.rahkonen@…486…> wrote:
Hi,
The problem with very dark images like Victoria had today is not uncommon especially with 16- or 32-bit images. How about adding a simple raster style that does ContrastEnhancement into the standard styles which are delivered in the standard data_dir? Would be easier to make black images visible than by writing SLD by hand and by reading http://docs.geoserver.org/stable/en/user/styling/sld-reference/rastersymbolizer.html?
-Jukka Rahkonen-
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