Even, thank you very much for answering me so quicly With the PHOTOMETRIC creation option to MINISBLACK, I get now : Band 1 Block=100x20 Type=Byte, ColorInterp=Gray Band 2 Block=100x20 Type=Byte, ColorInterp=Undefined Band 3 Block=100x20 Type=Byte, ColorInterp=Undefined Band 4 Block=100x20 Type=Byte, ColorInterp=Undefined
Does this option change anything in the metadatas or in the headers of the written file ? But I try to make the same thing as an exemple file I have, which has this interpretation whith gdalinfo (GDAL 1.7.3) : Metadata: TIFFTAG_IMAGEDESCRIPTION=B3 B2 B1 B4 TIFFTAG_DATETIME=20050824 18:08:22 AREA_OR_POINT=Point Image Structure Metadata: INTERLEAVE=BAND Corner Coordinates: Upper Left ( 0.0, 0.0) Lower Left ( 0.0, 3000.0) Upper Right ( 3000.0, 0.0) Lower Right ( 3000.0, 3000.0) Center ( 1500.0, 1500.0) Band 1 Block=3000x500 Type=Byte, ColorInterp=Red Band 2 Block=3000x500 Type=Byte, ColorInterp=Green Band 3 Block=3000x500 Type=Byte, ColorInterp=Blue Band 4 Block=3000x500 Type=Byte, ColorInterp=Undefined My goal is to have an "RGB-Undefined" color interpretation. Have you any idea of the creation option (or driver option ?) to set to have the same color interpretations ? Thank you in advance Nicky 2011/4/18 Even Rouault <even.roua...@mines-paris.org> > Selon Nicolas Mayer <nmayer31...@gmail.com>: > > Retry by setting the PHOTOMETRIC creation option to MINISBLACK. Otherwise, > by > default, without specifying it, GDAL assumes that the PHOTOMETRIC is RGB > and > that the 4th band is an alpha band. > > You should get : > Band 1 Block=100x20 Type=Byte, ColorInterp=Gray > Band 2 Block=100x20 Type=Byte, ColorInterp=Undefined > Band 3 Block=100x20 Type=Byte, ColorInterp=Undefined > Band 4 Block=100x20 Type=Byte, ColorInterp=Undefined > > There's no way in the TIFF format to really specify the color > interpretation of > each band. The way GDAL builds the color interpretation when reading a TIFF > file > is a combination of the value of the PHOTOMETRIC and EXTRASAMPLES tag. > > > Hello > > > > I have a problem with the geotiff (GTiff) driver. > > > > I create a 4-bands raster image in a c++ program. The fourth band was > > considered as an alpha band in the geotiff image (actually, it is near > > infrared : NIR) > > > > $ gdalinfo new_geotiff.tif > > Driver: GTiff/GeoTIFF > > Files: new__geotiff.tif > > Size is 100, 100 > > (...) > > Band 1 Block=100x20 Type=Byte, ColorInterp=Red > > Mask Flags: PER_DATASET ALPHA > > Band 2 Block=100x20 Type=Byte, ColorInterp=Green > > Mask Flags: PER_DATASET ALPHA > > Band 3 Block=100x20 Type=Byte, ColorInterp=Blue > > Mask Flags: PER_DATASET ALPHA > > Band 4 Block=100x20 Type=Byte, ColorInterp=Alpha > > > > How to remove the Color interpretation 'alpha' and the mask flags ? > > > > I want to have : > > > > Band 1 Block=100x20 Type=Byte, ColorInterp=Red > > Band 2 Block=100x20 Type=Byte, ColorInterp=Green > > Band 3 Block=100x20 Type=Byte, ColorInterp=Blue > > Band 4 Block=100x20 Type=Byte, ColorInterp=Undefined > > > > I already tryed : > > pDS->GetRasterBand(4)->SetColorInterpretation(GCI_Undefined ); > > > > I tryed too to set the creation option : "ALPHA" to "NO". > > > > > > Thanks in advance for any help. > > > > Nicky > > > > >
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