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scanning large format: to the limit (and beyond)



 
 
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  #31  
Old May 30th 04, 06:02 PM
Roger N. Clark (change username to rnclark)
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Default scanning large format: to the limit (and beyond)

Tom Monego wrote:

Ive done experiments with different ppi prints, going up to
600ppi. see:
http://www.clarkvision.com/imagedetail/printer-ppi

I've done blind tests of people sorting prints in order
of sharpness. In good "office" or outdoor lighting almost
everyone gets the sequence correct, choosing the 600 ppi
print as sharpest. As light levels drop, it becomes more
difficult. I need to present the statistics on the
above page.

Roger



Pushing the standard accepted norm is interesting especially in conservative
relms like large format photography and printing. As i said I saw a plateau at
360ppi but it could have been that I just didn't have the res in the scan to
begin with.

Tom

It might also be limits in the printer driver.

Roger

  #32  
Old July 6th 04, 09:04 AM
Jan Brittenson
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Default scanning large format: to the limit (and beyond)

Roger N. Clark (change username to rnclark) wrote:

Tom,
Ive done experiments with different ppi prints, going up to
600ppi. see:
http://www.clarkvision.com/imagedetail/printer-ppi

I've done blind tests of people sorting prints in order
of sharpness. In good "office" or outdoor lighting almost
everyone gets the sequence correct, choosing the 600 ppi
print as sharpest.


There doesn't appear to be anything resolved in the 600 ppi
print that's not in the 300 ppi. You can probably get the
same contrast by simply sharpening the 300 ppi file to the
same level. It would at least, if nothing else, make it
easier to tell the difference without having to take the
different degrees of sharpening into account as well.
 




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