[gdal-dev] Merging tiff4 files

[Andrea Peri]

Etienne,
you are really reason.

I often forgot the great powerful of the tiff driver and so forgot also to
read the tiff driver page.

Thx to remenber me this.

Regards,

2011/9/3 Etienne Tourigny <etiennesky.dev at gmail.com>

> Andrea,
>
> please read the gtiff driver page at http://www.gdal.org/frmt_gtiff.html
>
> you need to add a few options, such as -co COMPRESS=CCITTFAX4 -co NBITS=1
>
> Etienne
>
> On Fri, Sep 2, 2011 at 7:15 PM, Andrea Peri <aperi2007 at gmail.com> wrote:
> >
> > Hi Frank,
> > thx for very rapid response.
> >
> > gdal_merge.py now work and the result is intellegible.
> >
> > testing the result ,
> > I notice the result is a 256 color image.
> >
> > Instead the starting image was true CCITTFax4 raster.
> > This mean a huge dimension of files.
> >
> > Is possible to have a real Tiff4 (1 bit color) image as result ?
> >
> > Thx,
> >
> > Andrea.
> >
> > 2011/9/2 Frank Warmerdam <warmerdam at pobox.com>
> >>
> >> Andrea,
> >>
> >> I think the problem is that these are one bit files with
> >> a black/white color table and by default gdal_merge.py
> >> does not copy the color table.  If you add the -pct
> >> switch it should do so.
> >>
> >> I imagine the result file does have pixels with values of
> >> zero and one, but you won't see them as different in
> >> most viewers.
> >>
> >> Best regards,
> >>
> >> On Fri, Sep 2, 2011 at 2:40 PM, Andrea Peri <aperi2007 at gmail.com>
> wrote:
> >> > Hi,
> >> > I need to merge some Tiff4 (bw) raster and obtain 1 only more big
> tiff4
> >> > raster.
> >> >
> >> > I'm try-ing this with gdal_merge.py
> >> > and using a comand like this:
> >> >
> >> > python gdal_merge.py -o ../raster/216.tif -n 1 -ot Byte
> >> > ../raster/10k/216*.tif
> >> >
> >> > Unfortunately the resulted raster is intellegible (the input raster
> was all
> >> > clearly visible).
> >> > It is an all black image :(
> >> >
> >> > I tried also with option "-n 0" but the result is the same.
> >> >
> >> > I analyze the input raster using gdalinfo, and the result is this.
> >> >
> >> > ------------------
> >> >>gdalinfo.exe ../raster/10k/216100.tif
> >> > Driver: GTiff/GeoTIFF
> >> > Files: ../raster/10k/216100.tif
> >> >        ../raster/10k/216100.tfw
> >> > Size is 10065, 10049
> >> > Coordinate System is:
> >> > LOCAL_CS["unnamed",
> >> >     UNIT["unknown",1]]
> >> > Origin = (1561222.860009765700000,4927094.449960937700000)
> >> > Pixel Size = (0.500000000000000,-0.500000000000000)
> >> > Metadata:
> >> >   AREA_OR_POINT=Point
> >> >   TIFFTAG_RESOLUTIONUNIT=1 (unitless)
> >> >   TIFFTAG_SOFTWARE=Arc/Info
> >> >   TIFFTAG_XRESOLUTION=2
> >> >   TIFFTAG_YRESOLUTION=2
> >> > Image Structure Metadata:
> >> >   COMPRESSION=CCITTFAX4
> >> >   INTERLEAVE=BAND
> >> >   MINISWHITE=YES
> >> > Corner Coordinates:
> >> > Upper Left  ( 1561222.860, 4927094.450)
> >> > Lower Left  ( 1561222.860, 4922069.950)
> >> > Upper Right ( 1566255.360, 4927094.450)
> >> > Lower Right ( 1566255.360, 4922069.950)
> >> > Center      ( 1563739.110, 4924582.200)
> >> > Band 1 Block=10065x32 Type=Byte, ColorInterp=Palette
> >> >   Image Structure Metadata:
> >> >     NBITS=1
> >> >   Color Table (RGB with 2 entries)
> >> >     0: 255,255,255,255
> >> >     1: 0,0,0,255
> >> > -----------------
> >> >
> >> > What am I wrong ?
> >> >
> >> > Thx,
> >> >
> >> > --
> >> > -----------------
> >> > Andrea Peri
> >> > . . . . . . . . .
> >> > qwerty àèìòù
> >> > -----------------
> >> >
> >> >
> >> > _______________________________________________
> >> > gdal-dev mailing list
> >> > gdal-dev at lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/gdal-dev
> >> >
> >>
> >>
> >>
> >> --
> >>
> ---------------------------------------+--------------------------------------
> >> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> >> light and sound - activate the windows | http://pobox.com/~warmerdam
> >> and watch the world go round - Rush    | Geospatial Software Developer
> >
> >
> >
> > --
> > -----------------
> > Andrea Peri
> > . . . . . . . . .
> > qwerty àèìòù
> > -----------------
> >
> >
> > _______________________________________________
> > gdal-dev mailing list
> > gdal-dev at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/gdal-dev
>



-- 
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-----------------
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