Archived posting to the Leica Users Group, 2007/06/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks for the accolade - how much is the annual apanage? Douglas (but you can say "Sir" to me if you like :-) ) G Hopkinson wrote: > Douglas, I can tell you right now, you are in sooo much trouble when Ted > sees this message ;-) > You have now been crowned king Technogeek of Sharpening. > > Great pictures though. > > Cheers > Hoppy > > -----Original Message----- > From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org > [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of > Douglas Sharp > Sent: Tuesday, 12 June 2007 18:18 > To: Leica Users Group > Subject: Re: [Leica] Lilies - jumping on the bandwagon - Neat Image > > Hello, Don > thanks for your kind comments. > > Neat image offers (almost too many options) for noise reduction and > sharpening in 3 different bands and a selection of whether to do it in > RGB or YCrCb - the second option means you can sharpen in the luminance > channel alone and avoid most of the sharpen artefacts found with other > programs. The options, as far as I understand the fundamental idea of > it, are low, medium and high-pass filters and when you set to > "conservative" sharpening this probably prevents clipping around the > respective Nyquist frequencies or cut-off points for the respective > filters, or it tapers the flanks of the spectra more strongly. I also > suspect that the noise filters are in reject mode with a mix-back > function and that sharpening is purely pass - only the programmer knows, > and he must be good. > > On the other hand, it may be some clever use of FK filtering (frequency > /wavenumber) or a deconvolution process, or a complex random noise > attenuation program, but one thing is clear to me, whoever worked it out > hasn't been looking at pictures, it's all physics and math that ALSO > works on images. In spectral analysis, digital technologies couldn't > care less whether it's a signal, a frequency or a colour - it's all just > numbers. > I only wish I had had something as efficient as Neat Image for cleaning > up noisy seismic data. > > http://www.neatimage.com/ > > Cheers > Douglas > > > Don Dory wrote: > >> The end result is very nice indeed. When you say you sharpened in three >> frequencies I would appreciate a little more information on that. >> >> On 6/11/07, Douglas Sharp <douglas.sharp@gmx.de> wrote: >> >>> So many lovely lilies!!! >>> Motivation enough to go deep into my "back catalogue" of flowers to dig >>> up some of my own. >>> >>> A little abstract, and far removed from a garden context - hope you like >>> them. >>> >>> >>> http://gallery.leica-users.org/v/DMS/New-Old-Pictures/_MG_1143_edited-2.jpg.html >>> >>> >>> >>> http://gallery.leica-users.org/v/DMS/New-Old-Pictures/_MG_1182_edited-3.jpg.html >>> >>> >>> >>> http://gallery.leica-users.org/v/DMS/New-Old-Pictures/_MG_1091_edited-6.jpg.html >>> >>> >>> >>> http://gallery.leica-users.org/v/DMS/New-Old-Pictures/_MG_1136_edited-3.jpg.html >>> >>> >>> >>> Comments welcome >>> Douglas >>> (before anyone asks - yes, there was a fair amountIMG: of Photoshopping >>> involved) >>> >>> >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >> >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > >