Hi Frank, I'm sorry for my missing response yet. Nevertheless thank you for your helpful explanation!
But since it seems that there is no way getting gdal converted tif-files with creation option NBITS=1 properly displayed in MapInfo Professional, it might make sense looking for another shell program. This could work "in-a-pipe" and should convert a paletted gdal output file into a 1bit file without color table just IrfanView does. Do you know a free software tool that will fit my needs? Or is there another way to think about? If the behavior of MapInfo Professional isn't default I could contact Pitney Bowes for sure as well. But I wouldn't rather wait for a solution from there ... Thanks so far, Best regards Andreas Mit freundlichen Grüßen Im Auftrag Andreas Fischer Kreis Unna - Der Landrat Zentrale Datenverarbeitung Friedrich-Ebert-Straße 17 59425 Unna Fon 02 3 03 27-44 16 Fax 0 23 03 27-28 96 andreas.fisc...@kreis-unna.de www.kreis-unna.de -----Ursprüngliche Nachricht----- Von: fwarmer...@gmail.com [mailto:fwarmer...@gmail.com] Im Auftrag von Frank Warmerdam Gesendet: Dienstag, 15. Juni 2010 16:34 An: Fischer, Andreas Cc: gdal-dev@lists.osgeo.org Betreff: Re: AW: [gdal-dev] gdalwarp and GTiff creation option NBITS On Mon, Jun 14, 2010 at 11:06 AM, Fischer, Andreas <andreas.fisc...@kreis-unna.de> wrote: > Hi Frank, > thanks for your hints. I could finally use tiffinfo very easily from > FWTools-Shell, for I'm testing with a windows machine :-) ... > b) File transformed with gdalwarp (gdal-file) > > TIFFReadDirectory: Warning, Unknown field with tag 42113 (0xa481) encountered. > TIFF Directory at offset 0x10a8036 (17465398) > Image Width: 11812 Image Length: 11812 > Bits/Sample: 1 > Sample Format: unsigned integer > Compression Scheme: None > Photometric Interpretation: palette color (RGB from colormap) > Samples/Pixel: 1 > Rows/Strip: 5 > Planar Configuration: single image plane > Color Map: (present) > Tag 42113: 255 > > > c) gdal-file (b) opened with IrfanView and saved as a copy without changes > > TIFF Directory at offset 0x10a35bc (17446332) > Image Width: 11812 Image Length: 11812 > Resolution: 0, 0 pixels/inch > Bits/Sample: 1 > Compression Scheme: None > Photometric Interpretation: min-is-white > Orientation: row 0 top, col 0 lhs > Samples/Pixel: 1 > Rows/Strip: 5 > Planar Configuration: single image plane > Software: IrfanView Andreas, The most obvious difference between these is that the GDAL generated file has a color table while IrfanView does not save one with it's 1 bit output file. It would appear that some software packages do not properly support paletted one bit files. Unfortunately, because GDAL "sees" the min-is-white input file as paletted it produces a paletted output file. I cannot think of an easy way of avoiding this. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent Diese E-Mail wurde beim Ausgang auf Viren geprueft. Wegen der potentiellen Gefahr auf den Uebertragungswegen wird zu einer Vireneingangskontrolle geraten. Eine Haftung für Virenfreiheit wird ausgeschlossen. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
