[Openicc] [Gimp-print-devel] Drop size calibration

[Michael Sweet]

Robert Krawitz wrote:
> ...
> Another question: in the long run, do you think 16 bits of input
> precision are sufficient, or should we be moving to 31 or 32 bits?
> We have a lot of 16-bit assumptions in the data path, and if we should
> be moving to higher bit depths, it's something we'd need to look at
> closely.

Mathematically you need a patch of at least 128x128 dots (for 3 drop
sizes) to represent 16-bits worth of levels and 32768x32768 dots (or
about 11x11 inches at 2880 DPI!) for 32-bits worth.  In practice you
need more than that thanks to dot gain effects, making 32-bit
accuracy unpractical.  Even 16-bit accuracy is only achievable with
lower image resolutions (about 22.5 PPI for a 2880 DPI printer)...

-- 
______________________________________________________________________
Michael Sweet, Easy Software Products           mike at easysw dot com