Pieter, Thanks, this is very helpful in understanding where the numbers are coming from.
Frits Wüthrich Pieter Nagel wrote: > On Sat, Feb 16, 2002 at 12:54:41PM -0000, Frits J. W?thrich wrote: > > 100 lines per millimetre is 25.4 x 100 is 2540 lines per inch. > Is it OK to > > say that this could be translated to 2540 ppi, or do I miss > something here? > So you need to sample at at least 400 lines per millimetre to get all the > detail. This is a well-known aspect of sampling theory - you need to I think that was Nyquist, if memory serves me right. > sample at twice the frequency of the signal you want to capture. This is > why audio CD's sample sound at 44KHz - the highest pitch the human ear can > hear is about 22KHz. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
