[gdal-dev] GDALRasterBand to NSImage

[Even Rouault]

Le mercredi 23 avril 2014 22:47:04, Patrick Cannon a écrit :
> Hi Even,
> 
> Thank you for the reply.
> 
> Yes I understand it is an index for the color table.
> 
> But the raster data is not all the same and I would expect the index to
> have something other than a 1 returned for each byte.
> 
> If I use the same call under Linux with the exact same file it works as
> expected.

Same version ? Hum, this is strange. Perhaps you should run the 
gdrivers/bsb.py script from the GDAL autotest suite to check that your Mac 
GDAL build is OK.

> 
> So, is there a compile option for GDAL that may have been missed that is
> causing it to handle the file incorrectly?

I can't think to one that could influence the behaviour of the BSB driver.

> 
> Thanks.
> Patrick
> 
> > Le mercredi 23 avril 2014 22:22:45, Patrick Cannon a écrit :
> >> Hello Everyone,
> >> 
> >> I have been trying to get a few raster files loaded via GDAL but it
> >> seems
> >> that all I get back from GDALRasterIO is a bunch of 1’s which then get
> >> set
> >> as 255 or white.
> >> 
> >> The call I am using is:
> >>     GDALRasterIO(ds->GetRasterBand(1), GF_Read,
> >>     
> >>                  0, 0, pixWide, pixHigh,
> >>                  fileData, pixWide, pixHigh, GDT_Byte, 0, 0);
> >> 
> >> The meta data for the chart looks valid:
> >> BSB_KNP=SC=458596,GD=NAD83,PR=MERCATOR,PP=28.867,PI=30.000,SP=,SK=0.0021
> >> 196 ,TA=90.0021196,UN=FATHOMS,SD=MEAN LOWER LOW WATER,DX=45.86,DY=45.86
> > 
> > BSB datasets come with a color palette (GDALColorTable). So
> > GDALRasterIO() returns you the index in the color palette for each
> > pixel. You have then to
> > combine that with the R,G,B components of the color table.
> > 
> >> So I would expect the data to be getting filled correctly.
> >> 
> >> OS X 10.9 with Xcode 5.1.1.
> >> 
> >> If anyone has a suggestion or could point me to a working Objective-C
> >> example that would be great.
> >> 
> >> Thanks,
> >> Patrick
> > 
> > --
> > Geospatial professional services
> > http://even.rouault.free.fr/services.html

-- 
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