Digital BW, The Print

Austin Franklin wrote:

>
>
> > Imaging theory says to send data to the printer driver in 1/2 or 1/3
> > increments of upper resolution dpi.
>
> Hi Keith,
>
> Where did you get that information from?  I believe this has been a 
> refuted
> myth, at least as far as today's Epson printers go.

Artifacts may be less prevalent with the EPSON drivers in current use, 
but the theory is still valid..

>
> > Ergo, the magic numbers for a 1270/870  are 360, 480, and 720 dpi... (at
> > 1440 dpi print resolution) or for a 1280 at 1440 dpi print resolution
>
> I do not believe there are any magic numbers for printer resolution in 
> many
> of today's printers, and certainly not Epsons.  It is entirely 
> dependant on
> the printer driver, and what halftone algorithm is being used.

True... But one other factor plays into it..  I haven't done a study on 
it yet, but I'm wondering if print overall print times might actually be 
longer when not working with data in those multiples..?  The more 
extended interpolation that is done internally by the driver SHOULD (not 
necessarily WOULD) increase print time from start to finish..  Whether 
that time is negligible or not as a % of overall print time would be 
interesting..

If it were shown to take incrementally longer, and personally, I don't 
have the time right now to run tests..  I would likely opt for doing the 
work in Pshop to shorten the time the background process is running..

I shall accept your assertion that differences may not be apparent in 
downsampling, but in upsampling, you still need to aim for some number 
anyway.  In those instances it still IS unrefuted that something like 
Genuine Fractals will do a better job AND that images below 360 dpi are 
losing detail as image dpi decreases.

[Keith]
 
 

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