I do not have experience submitting digital photos to a newspaper, but I do know that most such photos have been taken with a 2000-2500 ppi SLR such as the Kodak DCS *20 series or the Canon D30. In fact the old AP2000 was a 2000 ppi Camera (historical note: The AP2000 was made for the Associated Press by Kodak. It is the ancestor of all the Kodak DCS Cameras).
133 line screen for a newspaper? My how quality has improved over the years. I would have thought that newsprint paper could not sustain such a fine screen. But your math is fine, your image needs 1.5 to 2.0 times the resolution of your halftone screen. --graywolf ------------------------------------------------- The optimist's cup is half full, The pessimist's is half empty, The wise man enjoys his drink. ----- Original Message ----- From: Frantisek Vlcek <[EMAIL PROTECTED]> To: Anthony Farr <[EMAIL PROTECTED]> Sent: Wednesday, November 14, 2001 7:43 AM Subject: Re: digital pixels, etc... > Thanks, Anthony. I didn't knew the RD175 lost so many stops. Pity :) > > Now please about my math - I am interested in cheaper digital for use > in colour news photography, nothing AP-like but I do work for some > small magazines (on external basis) which need colour, which makes my > profit pretty marginal (after paying for film, pro processing and > prints,.... With B&W, I do it myself, and although not as quick as a > minilab for C41, I can do it much cheaper - bulk film, developing one > film for "few cents" in diluted Microphen 1+3,...). If I used digital > for this colour, is the quality high enough for the following math to > be valid? > > The colour newsp. use 133 lpi printing, unlike glossy > magazines/product cataloges which use higher, 180 lpi mostly. At 133 > lpi, I need about 200 ppi input (1.5x loss ratio according to Nyquyst > or whom). At 200 ppi=200dpi=200 pixels per inch, a 2 megapixel camera > can do roughly 14x19cm /5.5x8 inch on the paper (using 133 lpi -> 200 ppi). > Is the quality of the CCD (with the 1/3rd colour pixels per final > pixel interpolation in my mind) high enough for this math to work? So > a 4.1MP camera can do 28x21cm fullpage photo at 133lpi? Most news > photos I have seen at fullpage, from Reuters and AP showed visible > artifacting. But it might have been bad compression or whatever... > > So, anybody with real experience of submitting 2 or 2.5MP digital > photos for printing at 133lpi or 4MP photos for printing at 133lpi, at > maximum size with regard to pixel count of each? > > Thanks! > > Frantisek > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
