Thanks, that clarifies things a great deal. ----- Original Message ----- From: "Bob Frost" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, December 10, 2004 4:40 AM Subject: [filmscanners] Re: scanning at less than optical res
Laurie, I sent that reply to someone on another list who was using large-format film but then scanning it at one-quarter of the optical resolution of his scanner since he didn't want large files. There was some doubt as to whether I was correct, so I thought I would see what this filmscanners list had to say. Bob Frost. ----- Original Message ----- From: "LAURIE SOLOMON" <[EMAIL PROTECTED]> >If you scan at 1200dpi, the scanner usually either samples all the 4800 >possible data points per inch and throws three out of every four away, or >only samples every fourth possible point. So you are only getting one >quarter of the possible data from the film. So why scan at large format if >you are throwing three quarters of the film data away? Bob, I beliee you are correct; but I do not understand your question. What do you mean by "scan at large format" in this case? I must have missed something in the discussion. The first method,which you note, involves the actual sampling of original data using sampling algorithms and does result in a loss of ortiginal data; but the second method, which you speak of with respect to Vuescan and is available in almost all other scnning applications, involves resampling of the original sample data using formulas for combining and recombining data on the basis of all existing data and the formulas. Both methods, however, would involve the scanner reading during the scan all 4800 points; so both would involve a "scan at large format" - using your terms - or whatever optical format is used by the scanner. After the scan, everything else by way of sampling or resampling is either digital conversion via hardware or software generated. ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.289 / Virus Database: 265.5.0 - Release Date: 12/9/2004 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.289 / Virus Database: 265.5.0 - Release Date: 12/9/2004 ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body