RE: DPI and perception question

[Paul Weyn <paul@xxxxxxxxxxxxx>]

Ok. Thanks Roy and David, I think I’m beginning to understand.

 

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From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of PhotoRoy6@xxxxxxx
Sent: Friday, August 17, 2007 1:00 PM
To: List for Photo/Imaging Educators - Professionals - Students
Subject: Re: DPI and perception question

 

 

Hi Paul and Andy,

 

    A 20 x 24" print at 300 dpi = 123.6 MB file. A 20 x 24" print at 240 dpi = 79.1 MB file. Scanning from 35 mm (1"x 1.5") film needs to be done at 4000 dpi so one can sample down to 20 x 24 " at 240 dpi.

 

    With regards to viewing I had an experience where I thought an area on the file was orange when the whole picture was viewed on the screen and when I printed it the area came out red and yellow. When viewing the file again at 100% it was red and yellow.

 

Roy

 

 

 

 

 

In a message dated 8/17/2007 1:05:46 P.M. Eastern Daylight Time, paul@xxxxxxxxxxxxx writes:

Not sure I understand the process exactly either but when I have a 35mm
negative scanned to be printed at a maximum 20x24 size, the file size
created by my lab is about 80meg

 

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