> > From: "Bob W" <[EMAIL PROTECTED]> > Date: 2006/06/25 Sun PM 09:26:12 GMT > To: "'Pentax-Discuss Mail List'" <[email protected]> > Subject: Print sizes and megapixels > > Hi, > > I've been doing some calculations of print sizes and megapixels, and > found something I don't understand. > > If we assume the correct viewing distance for a print hanging on the > wall is about 90cm, and we accept that the maximum size of the > diagonal of the print should be half the viewing distance, then for > the 4:3rds system the print should be 36x27cm, giving a diagonal of > 45cm. This fits comfortably on A3 paper (29.7x42.0cm, about 11x16" in > American). > > Printers generally seem to print at about 300 dots per inch, which is > 118 dots per cm, as near as makes no difference. > > So for the printed area we need (27x118)x(36x118) = 13,534,128 pixels. > > Yet I'm sure I read about people making high quality 20x16" prints > from 6 - 10 megapixel cameras. > > What gives? >
Try Gurgling for "rezzing up" - the process of increasing a digital file by inserting information that was never there in the first place but might be a reasonable facsimilie of the original scene.... ----------------------------------------- Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
