clyde236 opened this issue on Feb 28, 2004 ยท 16 posts
RubiconDigital posted Sun, 29 February 2004 at 5:10 AM
Clyde, In response to your private email and your question, here's a clarification on the sharpening method I talked about. If you're using Photoshop, then change your image to LAB mode, make sure you have the channels palette open and select the Lightness channel. Do the unsharp mask operation on the Lightness channel. Then change back to RGB mode. For the Paint Shop Pro users, you have to split the image into HSL channels (Channel Splitting -> Split to HSL: this exact command may vary depenedent on your version), which will give you 3 images on screen - hue, saturation and lightness. Do the unsharp mask operation in the Lightness channel, then go Channel Combining ->Combine from HSL. Your new RGB image will be produced from the 3 channels that are on screen. Doing sharpening this way doesn't affect the colour information in the image, so is not prone to producing ugly colour shifts. I have found this to be an excellent way to sharpen my digital photographs and have also found it useful on 3d rendered images from time to time. I hope that clears up any possible confusion Clyde.