Hi List,
I'm running the following four queries against the same data (a packbits 
compressed geotiff):

    gdaladdo -r average --config COMPRESS_OVERVIEW JPEG --config 
PHOTOMETRIC_OVERVIEW YCBCR i1.tif 2 4 8 16

    gdaladdo -r average --config PHOTOMETRIC_OVERVIEW YCBCR i2.tif 2 4 8 16

    gdaladdo -r average i3.tif 2 4 8 16

    gdaladdo -r average --config COMPRESS_OVERVIEW PACKBITS i4.tif 2 4 8 16

All four outputs are binary identical and contain the requested internal 
overviews.

I can think of several possible reasons for this outcome (different compression 
type seems most probable), but invisibly failing to action semantically valid 
flags isn't good for raising or debugging errors. Does GDAL have a "verbose" 
mode? I can't seem to find one.

Cheers,
Jonathan

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