Hi, I had to deal a lot with palette tiff images a couple of years ago.
What I did was that edited the vrt files with sed inline editing: Some examples: Insert a text file after the row that is: /VRTRasterBand dataType="Byte" band="1" The inserted file here is orig_colortable_vrt.txt: sed -i -e '/VRTRasterBand dataType="Byte" band="1"/r orig_colortable_vrt.txt' image_6.vrt Remove a certain line that contains "NoDataValue" sed -i -e '/NoDataValue/d' image_6.vrt There a also a sed commands to delete certain rows. Just read many sed examples. Have fun / Lars Schylberg 22 april 2021 kl. 20:25, "Hotmail" <rlela...@hotmail.fr> skrev: > Hi all, > > I'm looking to modify the original ColorTable, when georeferencing, PNG => > gdal_translate + > gdalwarp => TIFF. > >> gdal_translate -of VRT -a_srs EPSG:4326 file_png file_vrt -a_ullr xxxx >> gdalwarp -s_srs EPSG:4326 -t_srs EPSG:3857 file_vrt file_tiff > > If I open the VRT file and do the edit manually, the output TIFF file is > correct. > The problem is that I have 524288 files ... so I would like to do the > modification automatically, > via gdal_translate. > But I don't quite understand using the parameters of the command ... > > • Original VRT & TIFF files > > # VRT > <VRTRasterBand dataType="Byte" band="1"> > <ColorInterp>Palette</ColorInterp> > <ColorTable> > <Entry c1="0" c2="0" c3="255" c4="255" /> > <Entry c1="255" c2="255" c3="255" c4="255" /> > <Entry c1="0" c2="0" c3="0" c4="255" /> > [...] > <Entry c1="0" c2="0" c3="0" c4="255" /> > </ColorTable> > </VRTRasterBand> > > # TIFF > Band 1 Block=63153x1 Type=Byte, ColorInterp=Palette > Color Table (RGB with 256 entries) > 0: 0,0,0,255 > 1: 255,255,255,255 > 2: 0,0,0,255 > [...] > 255: 0,0,0,255 > > I want this : > • Modified VRT and TIFF files > > # VRT > <VRTRasterBand dataType="Byte" band="1"> > <ColorInterp>Palette</ColorInterp> > <ColorTable> > <Entry c1="0" c2="0" c3="255" c4="255" /> > <Entry c1="0" c2="255" c3="0" c4="255" /> > <Entry c1="255" c2="0" c3="0" c4="255" /> > [...] > <Entry c1="255" c2="0" c3="0" c4="255" /> > </ColorTable> > </VRTRasterBand> > > # TIFF > Band 1 Block=63153x1 Type=Byte, ColorInterp=Palette > Color Table (RGB with 256 entries) > 0: 0,0,255,255 > 1: 0,255,0,255 > 2: 255,0,0,255 > [...] > 255: 255,0,0,255 > > Whatever I find, redirects me to gdaldem (which I can't use). In > gdal_translate, it seems to me > that the parameter -colorinterp_X might be suitable > but I can't find any concrete examples (or I have not looked in the right > place). > > I want to impose the following parameters: > Band 1 > Type = Byte > ColorInterp = Palette > Color Table (RGB with 256 entries) > > In ColorTable: > Entry 0 = 0,0,255,255 > Entry 1 = 0,255,0,255 > Entries 2 to 255 = 255,0,0,255 > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
