Hmm.. 5400 dpi is appr. equal to a 5400 pixels on the short side of a negative (1 inch = 24mm). This means a neg would be 5400 x 8100 pixels = 43,7 MP. I once calculated, that if a lens can resolve 100 linepairs/mm (equivalent to 3 pixel/mm - black-white black)), you'll have to scan the neg to appr. 78MP to reach the same resolution. But not a lot of lenses or film can actually do that. So, I guess about mayby 40MP to equal a 35mm neg/slide is a very good guess, based on the real world. I recall someone on this list did very complicated calculations based on their knowledg about digital cameras. The results were - as I recall - below 40MP.
Anyway, when I scan to a level above 1200-1800 DPI I can't really get more info(resoultion) out of the negative. This leaves the neg with about 2-4 MP 1200-1500dpi), but maybe my scanner (Epson Perfection 3200 PHOTO) isn't all that good. (BTW - a slide contains less information than a neg, but more than a print). Jens -----Oprindelig meddelelse----- Fra: Rob Studdert [mailto:[EMAIL PROTECTED] Sendt: 12. februar 2004 07:46 Til: [EMAIL PROTECTED] Emne: Re: megapixel equivalent of 35mm On 12 Feb 2004 at 13:18, Nenad Djurdjevic wrote: > I am sure this question has been asked before but what would be the > megapixel equivalent of a 35mm colour slide? I have heard about 9 > megapixels. Anyone know any better? It's all in the interpretation, if you would like the scan to resemble direct digital image capture then you need to scan at resolution somewhat under the films average grain size. However if you wish to utilize all the available information stored in a fine grain film then scanning at 5400 DPI will get you close. The resultant file would be approximately 39 megapixels or a 234MB file at 16 bits per pixel. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
