On Sat, Jan 19, 2019, at 12:55, Bernhard wrote:

> If I expose a bit darker (e.g. by reducing the flash output), then white 
> becomes too dark (<255) without the lowest values moving significantly 
> closer to black (=0).

Exposing darker by dimming the flash probably isn't what you want. Maybe try 
stopping down the lens for the desired black point, and then increasing flash 
power if needed for the white? Even then, that setup may simply not be able to 
create the needed range. You could try pointing the camera so that one edge of 
the frame shows the edge of the table and a truly dark space beyond it. The 
best way to keep light spill off of the "black" area is for there to be nothing 
there for light to hit. ;)

-- 
jys
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