RAW conversion. You can upsize a digital file quite satisfactorily during conversion. I convert all my files to 144 megabyte 16-bit images. For printing, I of course have to go 8-bit, which yields a 72 megabyte file. This gives me an 11 x 17 print at 360 dpi. My Epson 2200 loves it. If I wanted to go 16 x20, i'd proably print at slightly less dpi or upsize again with PhotoShop Binary Smooth. If you don't have a lot of noise, digital upsizes quite nicely. Paul On Jun 25, 2006, at 5:26 PM, Bob W wrote:
> 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 > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
