Digital BW, The Print

Hi Carolyn,

We were just taking hacks from different angles of the issue. I was looking
at why the variance in the histograms might be greater for Jim than for
Martin or you, while you are looking at why his prints may differ more than
the difference in histo numbers would suggest. For what I'm looking at it's
important that you all are consistent to each other, for what you are
looking at it's only important that each person be consistent between each
version of PS.

But it looks like you've established the posterization is more a component
of how the print is made than the variance between the histos, so, good
work!

Todd

> 
>> Maybe you guys should use the same image for your tests, like a step wedge
>> from this lists files?
> I'd rather use an image.
> 
>> 
>> Are you all using the same operating systems?
> nope
>> Do they all implement color
>> management similarly?
> they are supposed to.
> 
>> in PS are you all using the same color engine for your
>> conversions, do you all have black point compensation checked (or not) and
>> dither checked (or not) and are they all set up the same for both PS 6 & 7?
> all set up the same for PS6 and 7 in my tests Todd.  each different thing,
> intent, BPC, engine (already tested)...  (kept the same between the
> versions) yeilds variance in the histo's luminousity.
> 
> as for keeping things constant between the tests others are doing,  you'd
> have to include the inks and workflow, which I don't use.
> 
> But to see this difference in converion between PS versions is interesting.
> Just don't think it relates to Jim's printing problem or at least isn't the
> major cause.
> 
> Carolyn