Thanks Even Doing that (multiband with minisblack and alpha), and interleave=band, when computing overviews there is a problem. I opened an issue that explains it. https://github.com/OSGeo/gdal/issues/3939 I tried a solution, but I think it is not the proper one.
Cheers. Javier .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__ Entre dos pensamientos racionales hay infinitos pensamientos irracionales. On Sat, 5 Jun 2021 at 10:30, Even Rouault <[email protected]> wrote: > Javier, > > Le 05/06/2021 à 10:24, Javier Jimenez Shaw a écrit : > > Hi > > > > I am struggling to save my data in (Geo)TIFF files with the proper > > creation options. > > My data is not standard RGB(A), but a collection of bands like red, > > green, (not necessarily blue), another type of red, near infrared, > > etc, and Alpha. It can be uint8, uint16 or float. > > > > I was using PHOTOMETRIC=MINISBLACK and ALPHA=YES, but now I am not > > sure if this is the proper configuration. In addition to that, I am > > setting a ColorInterpretation to the bands (many bands as > > GCI_Undefined, like for Near Infrared. The alpha band is clear as > > GCI_AlphaBand). > This looks good. GDAL will potential write into its GDAL_METADATA XML > tag custom band color interpretation if the very basic ones implied by > only TIFF tags (Grey, Grey+Alpha, RGB, RGBA) don't fit your settings > > > > The "extra samples" is obscure to me, I do not know how many bands > > expects, and how many are "extra". > > (https://www.awaresystems.be/imaging/tiff/tifftags/extrasamples.html > > <https://www.awaresystems.be/imaging/tiff/tifftags/extrasamples.html>) > You shouldn't worry too much about that tag. The GeoTIFF driver will > take care of setting it. But basically if you use > Photometric=MinIsBlack, then count(extra_samples) = number_bands - 1, or > if you use Photometric=RGB, count(extra_samples) = number_bands - 3. > > > > TIFF says "There is no default for PhotometricInterpretation, and it > > is required. Do not rely on applications defaulting to what you want." > > in > > > https://www.awaresystems.be/imaging/tiff/tifftags/photometricinterpretation.html > > < > https://www.awaresystems.be/imaging/tiff/tifftags/photometricinterpretation.html > > > > > > How should I create my TIFFs? > > For what you describe, MinIsBlack is the appropriate Photometric value > > Even > > > -- > http://www.spatialys.com > My software is free, but my time generally not. > >
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