Archived posting to the Leica Users Group, 1999/09/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 10:37 AM 9/25/99 -0400, Chandos Michael Brown wrote: >Has anyone messed around with the Gaussian blur filter in PhotoShop? I've >been experimenting with it in an attempt to knock the edge off apparent >grain in enlargements. It seems to work surprisingly well. I haven't >read about this anywhere. Any comments? You'll also notice that it's very easy to knock off a lot of sharpness with that filter. What I do to use Gaussian blur to reduce grain is to first convert the photo from RGB to LAB and then to apply Gaussian blur to the alpha and beta channels. Then I apply unsharp mask to the "L" channel. That seems to be an industry-wide way to reduce graininess and not reduce overall sharpness, especially with images from digital cameras. Oh, I use it also to overcome apparent underexposure in a photo where there is an enormous amount of contrast. Such as a person with a window behind them that makes them look almost like a silhouette. You can really do amazing things with Photoshop, and Gaussian blur plus the other tools to remedy that. I make a grayscale mask of the highlights in a duplicate of the original image and then apply 5 or 6 Gaussian blur to the mask, and then import it as a selection and use color dodge via the mask to only bring up the shadows. It really works! Eric Welch St. Joseph, MO http://www.ponyexpress.net/~ewelch As the vacationing Scot in Canada was heard to say, "Weel, if yon's the size of yurr moose, Ah'd hate ta see the size of yurr cats"