[gdal-dev] Unusual RGB Tiff files with misleading PhotometricInterpretation: valid or not?

[Andrew C Aitchison]

On Thu, 15 Nov 2018, Mikael Rittri wrote:

> When I open the files in QGIS or ArcMap, they assume RGB for the
> default visualization but I don't know why. One of the files looks
> great in ArcMap by default (but slightly too white, I believe),
> while it looks very much too white by default in QGIS, although the
> QGIS display can be fixed by color re-configuration. For the other
> file, it is QGIS that displays a sensible image by default, whereas
> ArcMap displays it with very exaggerated contrast (the default QGIS
> display is brownish-rusty like Mars while the default ArcMap display
> is brightly reddish-white like Jupiter).  So the score is 1 - 1 for
> the ArcMap/QGIS contest... I think the very different default
> displays confirm that the files are troublesome or corrupt.

Sounds like different default gamma correction values.

There are a couple of different default gamma values,
so unless the files specify their gamma, the two applications
could easily pick the right default for different pictures ...

-- 
Andrew C. Aitchison					Cambridge, UK
 			andrew at aitchison.me.uk