Most color newspapers around here (including mine) utilize an 85 lpi screen, for a resolution of 170 dpi. A 2MP camera makes a very decent 6"x8" photo -- more if the exposure is very favorable and little cropping is used. Anything over 200 dpi is a waste because most press/newsprint combinations simply can't resolve more than that, plus you have to factor in an approximate 30 percent dot-gain during the printing process. But, the more megapixels you have, the easier it is to go large with the photos. A 4MP photo can cover a full page, but there will be artifacts even at that resolution, even if you use the entire frame. With the new smaller standard news page, you're trying to cover an 11-5/8"x21" area, and there's no way it'll cover a double-truck. Most paper's requirements aren't that stringent. 4MP does very well even for larger news photos.
----- Original Message ----- From: "Frantisek Vlcek" <[EMAIL PROTECTED]> To: "Anthony Farr" <[EMAIL PROTECTED]> Sent: Wednesday, November 14, 2001 6:43 AM Subject: Re: digital pixels, etc... > 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 .
