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 .
