[gdal-dev] Problematic TIFs

[Rob]

Thanks for the reply Cristian - out of curiousity, how big was that
overviewed raster?

On 21/04/2008, Balint Cristian <cristian.balint at oradea.rdsnet.ro> wrote:
>
>  Hello Rob,
>
>
> >gdalinfo TQ00.TIF
> Band 1 Block=4000x8 Type=Byte, ColorInterp=Red
> Band 2 Block=4000x8 Type=Byte, ColorInterp=Green
> Band 3 Block=4000x8 Type=Byte, ColorInterp=Blue
> Band 4 Block=4000x8 Type=Byte, ColorInterp=Alpha
>
> I'm currently using GDAL 1.2.0.0 (released 2004/03/01) on AIX.
>
>
> I think you use a very old gdal, these days gdal hitted version 1.5.1
> mainstream.
>
> I guess older gdal cannot handle custom bit-depth, look at my gdalinfo
> using 1.5.1
> its says we have an unusual 4bit depth:
>
> $ gdalinfo.exe TQ00.tiff
> Driver: GTiff/GeoTIFF
> Files: TQ00.tiff
> Size is 4000, 4000
> Coordinate System is `'
> Metadata:
>   TIFFTAG_XRESOLUTION=254
>   TIFFTAG_YRESOLUTION=254
>   TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
> Image Structure Metadata:
>   COMPRESSION=LZW
>   INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  (    0.0,    0.0)
> Lower Left  (    0.0, 4000.0)
> Upper Right ( 4000.0,    0.0)
> Lower Right ( 4000.0, 4000.0)
> Center      ( 2000.0, 2000.0)
> Band 1 Block=4000x8 Type=Byte, ColorInterp=Palette
>   Overviews: 2000x2000, 1000x1000, 500x500, 250x250
>   Image Structure Metadata:
>     NBITS=4
>   Color Table (RGB with 16 entries)
>     0: 4,4,4,255
>     1: 16,16,16,255
>     2: 45,45,45,255
>     3: 78,78,78,255
>     4: 111,111,111,255
>     5: 140,140,140,255
>     6: 156,156,156,255
>     7: 173,173,173,255
>     8: 181,181,181,255
>     9: 197,197,197,255
>    10: 214,214,214,255
>    11: 222,222,222,255
>    12: 231,231,231,255
>    13: 239,239,239,255
>    14: 247,247,247,255
>    15: 255,255,255,255
> I had no problem running gdaladdo over your sample:
>
>  gdaladdo TQ00.tiff 2 4 8 16
> 0...10...20...30...40...50...60...70...80...90...100 - done.
>
>   I think you should try build for yourself a newer gdal (i suggest 1.5.1
> latest), i am pretty sure that is doable fine on AIX,
> it should compile and work at all,  i've used it to pack it on
> linux-powerpc but never tryed for for AIX platform.
>
>
> ~cristian
>
>
>
>
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