On 22 Oct 2001, at 19:07, Doug Franklin wrote: > Anyway, you threw away a bunch of data when you captured the image a > lower resolution. Now you're going to make some up to get a > "reasonable facsimile" of what you could have had in the first place. > To go from 600 dpi to 9600 dpi, as the HP ScanJet 3300 and others do, > you have to create ***255*** new pixels from each pixel your sensor > captured! It takes a 16 x 16 pixel array on the 9600 dpi grid to > "cover" each 600 dpi pixel.
But at least a flat-bed or film scanner scans the three primary colours for each absolute pixel whereas in a digital camera the CCD is masked by a matrix of colour filters ie for every cluster of four pixels there are a red, blue and two green sensitive CCD pixels. These sensors and the surrounding ones are used to interpolate the actual colour of the pixels in the output file before you get to blatant pixel puffing :-( Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://www.ozemail.com.au/~distudio/publications.html - 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 .
