[Openicc] Drop size calibration

[Graeme Gill]

Gerhard Fuernkranz wrote:

> Btw: This statement, which brings drop sizes and light/dark transitions
> into relation, reminds me on another approach I have seen somewhere in
> the literature. This approach does the dark/light splitting in the
> dithering engine: It treats the e.g. 16 dot-on-dot overprint
> combinations of the three dot sizes of "C" and the three dot sizes of
> "c" as if they were 15 drop sizes of a single virtual cyan channel. Then
> these 15 virtual drop sizes are sorted by density, and dithering is done
> between the resulting 16 virtual levels. A requirement for this approach
> is of course that the hues of the dark and light inks must match
> sufficiently well, i.e. the dark inks should be basically the same
> colorant as the light ones, but at a higher concentration. I have no
> idea though, how well this approach works in practice...

I think this is the approach Epson recommends for it's printers.
Somewhere in their literature I recalling a recommendation
to avoid using the dark ink, small drop, & this pretty
much implies incorporating the light/dark ink into the
screening. I'd imagine that there are probably advantages to
do with screen smoothness and ink coverage in this approach.

Graeme Gill.