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#31
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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
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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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