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

[Alastair M. Robinson]

Hi

Robert Krawitz wrote:

> The exact technique I use is to interleave fixed 10% stripes of a
> larger drop size with variable stripes (0-100%) of a smaller drop
> size.  I then look for where there's no visible banding; that spot
> should indicate where equal amounts of ink are being printed with both
> drop sizes.

Clever :)

> I've tried with 5% instead of
> 10%, and get essentially the same results.

Have you tried heavier ink coverage, rather than lighter?

> I'm also seeing slightly different results for cyan
> vs. black (by maybe 5%), but that's likely to be within margin of
> error for the printer.

I guess yellow is going to be the hardest to calibrate visually in this 
manner - I presume the various inks are supposed to have identical 
dropsizes, yes?

> Right now I don't know why this is happening, or what it means.  In
> any case, this is the testpattern config file that I'm using for this
> (you'll need the most recent CVS update for all of this to work
> correctly).  Perhaps I'll try these drop sizes and see what happens.

I'd be very interested to hear how they perform.  Sadly it'll be a while 
before I have time to play with any of this myself, but I shall 
certainly have a go in due course :)

All the best,
--
Alastair M. Robinson