> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jim Davis > Sent: Friday, August 01, 2003 3:29 AM > To: [EMAIL PROTECTED] > Subject: Re: RE: G5 [was Re: EOS 1Ds & 10D interface] > > > "Chip Louie" <[EMAIL PROTECTED]> wrote/replied to: > > >If you have layers and can control the opacity of the layers there is > >probably a way to get sharpening action with minimal color noise added. > > > > Maybe you all should read this link: > http://www.bythom.com/sharpening.htm > > There's another way to do this without going to Lab color. Quoted from > this page: > > "A way to do this method without changing to Lab Color is to perform > sharpening as you usually would (Unsharp Mask), then choose Fade > Unsharp Mask from the Edit menu. In the dialog that appears, change > the Mode from Normal to Luminosity and click Okay." > > I know, I know, it's kind of part of a Nikon website. > > > > Jim Davis > Nature Photography > http://www.kjsl.com/~jbdavis/ >
Hi Jim, I was suggesting the LAB technique as a general solution to the dark side of simply using USM on an image. Using USM on a flat RGB image produces color halos that limit how far you can go with sharpening and generally messes up your image if used alone in quantity. It adds "ringing" (electronics term, I can't think of a better term to describe the effect), to the video signal like most people have on their TV sets who crank up the sharpness setting control. Good link, it explains a lot about what the PS unsharp controls do! There are several ways to sharpen and image, LAB is one way fading the USM'd layer is another, there's also high-pass sharpening and two or three others which can sharpen edges and also use just a color layer for portraits keeping a smooth skin texture. I also use other filters in PS to sharpen images depending on what it is and what I need for the image. Don't worry about it being a Nikon related site, the info is good and stands on its own! The liberations of data is a basic premise of the internet, of course it's not all correct politically and otherwise. lol! Cheers/Chip * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
