[robski]

1024 x 768 ( XGA 4:3 screen aspect ratio ) appears to be a common native resolution for many of the digital projectors. Most will re-sync and re-sample to other display standards. There are also some 1280 x 720 ( 16:9 screen aspect ratio ) intended for wide screen format images.

This link is quite informative on the workings of Digital projectors.

http://www.christiedigital.com/AMEN/...Resolution.htm

So Chris I doubt you are truly seeing the full resolution of 1600 x 1200

On the subject of photos for Newsprint, a field in which I am currently employed. The photos are not printed at 300 dpi. A printing press cannot print continuous tone images that you see on the computer screen. The images are re-sampled to produce what is called a halftone. A complex subject but in essence a range of different size dots to represent the different levels of colour.

The limits of the human vision system is said to be about 7 lines per mm or 180 lines per inch. To avoid beat frequencies and moire in the halftone re-sampling the input dpi needs to be at least double the output dpi (in halftoning the term lpi (lines per inch) is used instead of dpi) dpi is reserved for the resolution of the laser scanner that produces the printing plates.

So a 300 dpi photo you submit could be printed using a 150 lpi halftone typically used in high quality glossy magazines. Halftones typically around 100 lpi are used for your newspaper depending on the grade of newsprint paper and press used.