On Mon, July 29, 2013 01:45, Nikos Alexandris wrote: > Eric Goddard wrote: > >> > I gave up on that pansharpening attempt. I can test some of my imagery >> > tomorrow and let you know if I still have issues with it. > > Nikos Alexandris wrote: > >> [rest deleted] >> >> I can't get any decent looking colors, with any of the methods. I >> wonder if >> my images are not properly "aligned" or the like. PCA seems to approach >> it >> right -- the value ranges seem to fit the reflectance scheme (below 1.0) >> but the colors are so fancy... ? >> >> Will work on it later in the evening. > > To-day/-night I got it to work with 11-bit images! I rescaled them to [0, > 255] and that seems to work just fine. Even color rebalancing (i.e. of > Blue, > Green and Red fusioned with Pan -IKONOS spectral bands) after the > sharpening > appears acceptable. > > A bit skeptical though since the rescaling action throws away some of the > data's details... :-? > > All of my other attempts using out of [0, 255] range values, for example > using > Top-of-Atmosphere Reflectances (floating point values < 1.0) or the raw > IKONOS bands that range between [0, 2047], were not successful. > > So, does i.pansharpen expect only 8-bit images? Can someone confirm or > reject?
Looking at the i.pansharpen source code, I see that in all algorithms a function for histogram matching is called and IIUC, in that function, values seem to be limited to [0,255]. Maybe you should open a ticket on that. Moritz _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
