a proper deblur filter is too expensive to implement in current camera processors. however, it is a correct deblur that increases sharpness. the cost is some artifacts near sharp edges. you induce ringing in the MTF function instead of a smooth dropoff with resolution. digital sensors begin to show aliasing effects anyway at their resolution limits.
Herb... ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Tuesday, June 15, 2004 1:16 PM Subject: Re: IS in *istD > It's rather amazing how much you CAN'T do to correct flaws in a > photographic image by computer. Unsharp mask, for example, does not > in fact correct for bad focus--it just compensates for it by increasing > local contrast.
