posted on Oct, 26 2012 @ 02:45 PM
The "Unsharp MasK" filter in Photoshop is based on a digital simulation of an analog process that originated in Europe in the mid-thirties, and did
indeed involve a blurred interpos of a piece of film. The technique is about bringing up the contrast in high-frequency regions of an image.
I have a somewhat decent understanding of the various processes involved in photographic and digital sharpening, and I also have some knowledge of the
limitations of desktop-level tools, especially free ones. Contrary to what someone posted, I never made a claim that this freeware tool could
definitely bring a UFO out in a blurry shot.
I'll refrain from adding my input to ATS in the future. I should know better by now.