I am using a 4000 dpi scanner and would like to get > around the need to rescan/recrop images over and over depending on the > resolution required for each application. A full 35mm frame yields a 210MB file > in uncompressed
Err ... maths? My 2700 dpi scanner yeilds 27Mb uncompressed RGB files from a 35mm frame. Working it through: 24mm by 34mm = 0.945in by 1.339in (Converted to imperial units for the educationally challenged) = 3780px by 5354px === 20,204,100 pixels total. RGB(8-bit) = 3bytes/pixel = 60,600,000 bytes (+ a few header bytes) RGB(16-bit) = 6bytes/pixel = 121,000,000 bytes (+ a few header bytes) For an 8-bit per pixel image saved as a Windoze Bitmap the header is small (54bytes) I'm confused how you managed to push this up to 210Mb unless you are introducing unnecessary bloat - aka interpolation aka creating real image data from nothing (if your camera is a Fuji) Of course, an RLE compressed TIFF can easily be bigger than the uncompressed version but I would doubt it would make a factor of 210/121. Bob * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
