On Wednesday 22 June 2016 01:52:07 Saint Germain wrote:

[...]

> I haven't managed to take a correct picture, even though I
> have followed the requested constraints :
> - direct sunlight at noon
> - 35mm objective (equivalent 50mm)
> - deactivate all "enhance" options (except lens distortion)
> - ISO 100
> - aperture between f/8 and f/11
> - bracketing 1/3
> 
> I'm using Gimp to sample the GS0 and GS23 patch, and I am always either
> above 97% for the GS0 patch or under 3% for the GS23 patch but never at
> the same time !

I never tried this myself for lack of such a target, but did you set your 
camera to shoot sRGB images?

[...]

Tobias

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