![]() ![]() Check the “As layers” checkbox (see Note 2) and click OK. In the decompose dialog box, select LAB (or HSV see Note 1). Right-click on the duplicate image and select Image -> Mode -> Decompose. You can open it later to compare to the result. It might be wise to minimize the original image window now. Step 2 ¶ĭuplicate the image by pressing Ctrl+D or right-click and select Image -> Duplicate. Sharpening should always be the last step that you do. Note: be sure to do any other editing that you want to on the image first, especially downsampling or upsampling (resizing). It is noticeably soft, probably due to bad autofocus. Here’s the original image loaded into GIMP. I didn’t want to shrink the image windows down like I usually do for the other tutorials since sharpening and noise are subtle and really show up better at these larger sizes. You may want to maximize your browser window to properly see this tutorial. New information and comparison with the “warp sharp” script! The Procedure ¶ I adapted it for GIMP from a Photoshop tutorial on the photography web site (great web site BTW, I recommend it). Giving credit where credit is due: I did not come up with this method. Then you can load the channel mask as a selection and apply the unsharp mask to just the edges. create a channel mask that contains only the edges in the image.sharpen only the luminosity channel, and.This technique does two “smart” things to avoid sharpening noise: a blue sky-the blue channel tends to get a lot of noise). Often there will be large areas of the image that you know you don’t want to sharpen (e.g. A really good example of this is when you have an image with a lot of high ISO noise or film grain applying across-the-board sharpening will enhance the noise/grain and make it even more visible, especially in large prints. ![]() Applying an unsharp mask to an entire image is not always appropriate. In this tutorial I’ll show you how to do smart sharpening of your images. Jeschke and may not be used without permission of the author. Text and images Copyright (C) 2002 Eric R. ![]()
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