Hi, On a purely theoretical point of view, the human eye can resolve details at least 1/60th degree wide. This means, that the smallest detail the eye can see is about 3/10000 the viewing distance...
This means that, with a 6mpix sensor, a 20x30 cm print should be seen from a 33cm distance or more, which seems quite reasonable. As a rule of thumb, the viewing distance should equal the long border... Of course, these are only theoretical figures. As someone pointed in this thread, everyone may or may not find a given same print acceptable. But given those limits, the resolution should not be to blame. Patrice Bob W a écrit : > 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? > > Thanks, > Bob > > > > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
