[GRASSLIST:297] Re: r.out.gdal problem

[Otto Dassau]

Hi,

I think, using f.e. ERDAS/Img (HFA) as output format gives you a correct color 
table for the data with more than 8bit.

  Otto

Am Dienstag, 21. März 2006 20:24 schrieb Wolfgang Zillig:
> Int32 gives very unrealistic colors see
> http://www.student.kuleuven.ac.be/~s0167070/grass/a1.tif
> Int16 gives grayscale
>
>
> GRASS 6.1.cvs (uberg_mgi):/cygdrive/d/temp > r.out.gdal format=GTiff
> metaopt=TILED=YES,COMPRESS=JPEG,JPEG_QUALITY=75 input=a1 output=a1.tif
> type=Int32
> Writing format: GTiff
> Writing type:   Int32
> Input file size is 535, 422
> 0.Warning 1: Unable to export color table to GeoTIFF file.  Color
> tables can only be written to 1 bit 8bit GeoTIFF files.
> ..10...20...30...40...50...60...70...80...90...100 - done.
> GRASS 6.1.cvs (uberg_mgi):/cygdrive/d/temp >
>
> Wolfgang
>
> Jachym Cepicky schrieb:
> > I would say, that type=Int32 shold work fine
> >
> > jachym
> >
> > On Tue, Mar 21, 2006 at 06:53:50PM +0100, Wolfgang Zillig wrote:
> >> My raster map is from the type CELL (with a range of [0-32767]). Can I
> >> use (and how) r.out.gdal directly?
> >>
> >> Wolfgang
> >>
> >> Jachym Cepicky schrieb:
> >>> Hallo,
> >>>
> >>> On Tue, Mar 21, 2006 at 04:59:43PM +0100, Wolfgang Zillig wrote:
> >>>> To make it clear, I have a georeferenced raster grafic. r.out.tiff
> >>>> works, and I can do successfully:
> >>>>
> >>>> C:\Documents and Settings\s0167070>gdal_translate -of GTiff -co
> >>>> TILED=YES -co CO
> >>>> MPRESS=JPEG -co JPEG_QUALITY=65 in.tif out.tif
> >>>>
> >>>> (But I have to say that I also have FWTools installed on my computer,
> >>>> I haven't tried with cygwin)
> >>>>
> >>>> Is it possible to export a raster file with the command given above?
> >>>> Grass always complains that I have to specify the "type", which I
> >>>> don't know.
> >>>
> >>> Type is, what does your r.info your_map |grep "Data Type" you.
> >>>
> >>> This will be CELL (integer), DCELL or FCELL (floating point)
> >>>
> >>> r.out.tiff makes always integers from floating point maps. via
> >>> r.out.gdal's "type" option, you can specify the precision of resulting
> >>> raster file
> >>>
> >>> hope, this helps
> >>>
> >>> Jachym
> >>>
> >>>> Wolfgang
> >>>>
> >>>> Patton, Eric schrieb:
> >>>>> When you say graphic, do you mean a non-georeferenced image? I'm
> >>>>> guessing, maybe r.out.gdal is only good for georeferenced images.
> >>>>> Have you had any luck trying 'gdal_translate -of JPEG input output'?
> >>>>>
> >>>>> ~ Eric.
> >>>>> -----Original Message-----
> >>>>> From: owner-GRASSLIST at baylor.edu
> >>>>> To: grasslist-en
> >>>>> Sent: 3/21/2006 10:18 AM
> >>>>> Subject: [GRASSLIST:281] r.out.gdal problem
> >>>>>
> >>>>> Hello,
> >>>>>
> >>>>> I somehow don't completely understand the usage of r.out.gdal. I
> >>>>> prepared a graphic (which is an imported tiff) with r.composite. I
> >>>>> can export it with r.out.tiff without any problems. But how can I use
> >>>>> r.out.gdal to export it as JPEG (or GTiff with TILED=YES). I always
> >>>>> fail
> >>>>>
> >>>>> to specify the correct option for the required "type". I already
> >>>>> tried every possibility which is listed (Byte, Int16,...), but
> >>>>> without success. What "type" do I have to use?
> >>>>>
> >>>>> Thanks
> >>>>>
> >>>>> Wolfgang

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