QTR-Quadtone RIP

I'm trying to figure out QTR, getting ready to print target.
eye-one-readme.pdf says:

The 21x4 target is recommended for the best accuracy.  It has 4 patches for each step value and the QTR software will automatically average the 4 measurements which gives a more accurate result.

My question is: what will be more accurate with this target - measurements or printer profile? I understand that every patch measured 4 times and averaged gives more accurate measurement but will  profile be better than with 51-step target?

And for that matter - is 51-steps enough for quality printer profile? Bob Atkins for example uses 4096-step target for RGB profile.


Thank you,
Jacob
http://www.photo3dart.com

My feeling is that a smooth profile is the better profile.  There can
be a fair amount
of variation in patch density and measurement so the averaging helps to
reduce that affect.  21 steps may seem small compared to 4096 but the
RGB targets are 3 dimensions so there are really only 16 steps (4096=16x16x16)
in each dimension.  The 21 steps are already more than that.

Roy

On Sun, May 3, 2009 at 11:10 AM, Jacob <flashinet@...> wrote:
> I'm trying to figure out QTR, getting ready to print target.
> eye-one-readme.pdf says:
>
> The 21x4 target is recommended for the best accuracy.  It has 4 patches for each step value and the QTR software will automatically average the 4 measurements which gives a more accurate result.
>
> My question is: what will be more accurate with this target - measurements or printer profile? I understand that every patch measured 4 times and averaged gives more accurate measurement but will  profile be better than with 51-step target?
>
> And for that matter - is 51-steps enough for quality printer profile? Bob Atkins for example uses 4096-step target for RGB profile.
>
>
> Thank you,
> Jacob
> http://www.photo3dart.com
>
>
>
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