Archived posting to the Leica Users Group, 2000/10/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]on 30/10/00 8:50 am, Austin Franklin at austin@darkroom.com wrote: >> What's the MB value for 100 film? I think you have the answer and will >> appreciate if you can share it with the rest of us. > > It depends on the film type, exposure, development and what you deem as > equivalent. My experience shows 8000DPI will get you to 'resolving' grain. > That would end up with 8,000 x 12,000 x 3, or 2.88M bytes for 8 bit/pixel > color, and 96M bytes for 8 bit grayscale. You mean 288 Mb I think? Anyway, our reztimate is the same for 100 film. Most filmscanners can pull out 12 bits of data, so unless you chuck 4 bits away which seems to defeat the purpose of the exercise, you have to think in terms of 16 bits, which is why my numbers were twice yours. When you consider 4x5 film the numbers get really scary. Using 16 bits and your figures above you arrive at file sizes of 2.5 Gb and 7.7Gb for monochrome and BW respectively. I guess these numbers are kind of meaningless in the real world, in the sense that to take advantage of the resolution you would have to output five-foot long four-foot wide prints at 600 dpi. Nevertheless there *are* printers out there that can do this... such a print would be pretty radical, right? One thing such an amazing print would let you do would be to comfortably view a wideangle shot from the true centre of perspective, which is always cool. Let's say you used a 90mm lens and made a five-foot wide print... the magnification is 12x, so you'd stand just over a metre away looking at a print which had the quality of a 16x12 from 35mm. Hmmmm... now I'm tempted... that leafscan of yours, Austin.... what did you say its dpi was??? - -- Johnny Deadman http://www.pinkheadedbug.com