The advantages of the Piezography system derive from the number of inks used (usually seven but sometimes six), combined with the large amount of overlap between the inks in the Piezography QTR curves. This means that at most luminosity levels (other than the upper highlights), a larger number of inks are used to print that luminosity level than most other approaches, certainly more than in QTR-K3 or ABW. This means that they are able to use a higher ink loading. Also the number of inks used simultaneously combined with the QTR dithering algorithm means that there is no or very little white space on the page between the dots, leading to higher resolution and smoother tonal transitions.
Don't ask me to defend or further explain this - it's just a summary of what I've read.
---In QuadtoneRIP@yahoogroups.com, <richard@...> wrote :
##What is a piezography print?
<snio>
Setting lower limits will allow you to increase the overlap without flooding the paper (don’t set them too low, like in the 20s, or you will get weak feeling prints).