So there is no way of changing the nearest-neighbour resampling in d.rast to lanczos for example?
> If you want optimal output, the display size needs to match the > current region, How do I adjust the current region to match the display size? Region works with rows and columns, so what is the connection to my display pixels? > Either that, or render the map at its native resolution, then resample > using an image-processing program. This is not an option, because I need the 'prettier' image inside GRASS to vectorize some features. Thank you, -- Sebastian Beyer On Friday, July 8, 2011 at 6:00 AM, Glynn Clements wrote: > > sleepysebi wrote: > > > since April I'm working with GRASS and I think by now I got the basics. > > Now I'm working with high resolution satellite data, looking for small > > structures in ice. > > My Rasterimages have got a resolution up to 2.5 meters per pixel, but most > > of the time > > I don't zoom in that far. > > So the Problem is, when zoomed out GRASS doesn't displays the raster the way > > I want it to. > > To me it seems that it's a problem with resampling the image when > > displaying, but I'm not shure if I'm missing something. > > To make it clear I made a little screenshot: > > > > http://imageshack.us/f/225/resamplecomparison.png/ > > > > So when at the same zoom lvl in EOG, it does some kind of 'smoothing' which > > looks way better. > > > > I know I can use *r.resamp.interp to resample, using lanczos for example, > > but this is more for the final output, not for working inside GRASS > > (vectorizing,...). > > The GRASS library resamples all input maps to the current region using > nearest-neighbour resampling. d.rast then resamples the data to the > display (image or window) size, again using nearest-neighbour > resampling. > > If you want optimal output, the display size needs to match the > current region, and the input map needs to be explicitly resampled to > the current region using e.g. r.resamp.interp or r.resamp.filter. > > Either that, or render the map at its native resolution, then resample > using an image-processing program. > > -- > Glynn Clements <gl...@gclements.plus.com (mailto:gl...@gclements.plus.com)>
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