QTR-Quadtone RIP

Ernst Dinkla wrote:

> Again, there's more to gain in my opinion with multiple 
> readings of more random linearisation targets that are 
> printed at two angles to the print direction and building 
> the linearisation on the average of the measurements. Same 
> for the QTR profile.
> 

Ernst

Could you summarise what the advantages of random targets are over 
ordered ones? They are rather inconvenient for those of us with more 
primitive devices.

Also could you please explain what you mean by printing the target at 
two angles. Do you mean in portrait & in landscape modes? If so why 
would that be necessary?

thanks & regards
Howard