[Geopackage] Displaying Geopackage Raster data

Even Rouault even.rouault at spatialys.com
Fri Jun 19 14:56:31 EDT 2015


Le vendredi 19 juin 2015 20:42:22, Burken, David a écrit :
> Yeah I get weird colors...  I tried a couple of different schemes with
> no luck.
> 
> So does QGIS display correct rgb values?

QGIS "just" displays the buffers that GDAL gives it back ;-), so no, weird 
colors.

> 
> On 06/19/2015 02:31 PM, Even Rouault wrote:
> > Le vendredi 19 juin 2015 18:46:03, Burken, David a écrit :
> >> Hi Phillip,
> >> 
> >> I can read with the ossim code but they are  using jpeg tiles with a
> >> CMYK compression and I can't get the colors correct.  I think the gdal
> >> folks complained about this also.  The original Whitehorse gpkg which
> >> they said was incorrect I could read just fine.  We usually do pnga for
> >> the edge tiles that are partial and plain old JCS_RRG jpeg for interior
> >> tiles.  I thinks they are using the "K" for alpha maybe.
> > 
> > I tried your hypothesis since GDAL does CMYK -> RGB conversion, by
> > considering CMY as RGB without conversion, but the result is complete
> > garbage, whereas the current CMYK -> RGB conversion produce just "weird"
> > colors... One hypothesis I didn't test is to take the reverse value of K
> > since this is often a source of ambiguity...
> > 
> >> Anyway if I could crack
> >> the nut on the jpeg decode I would say you could use ossim-geocell as a
> >> viewer.  It works really nice...
> >> 
> >> Take care,
> >> Dave
> >> 
> >> On 06/19/2015 11:07 AM, Philipp Seyerlein wrote:
> >> I'm looking for a program to display raster images and furthermore for
> >> raster example-data. For so far, I tried to display the
> >> ERDC_Whitehorse_GeoPackage.gpkg and the similar data
> >> 2015_05_05_Whitehorse_3857.gpkg. Neither ArcGIS 10.3, nor QGIS 2.8.1 can
> >> read it with default settings. In ArcGIS it should be possible, also
> >> QGIS should be able, perhaps with implementation of GDAL v2.0dev? Has
> >> anybody a solution or alternative software/data?
> > 
> > I confirm that QGIS when running against GDAL 2.0 can display raster
> > geopackage correctly.
> > 
> >> Best regards,
> >> 
> >> Philipp

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