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LAB SHARPENING Most digital images can do with a little sharpening before printing. Look at the bottom of the page to see the difference it can make. By sharpening in lab mode you can sharpen the image without adversely affecting colour (no halo effect).
Here's the image we're going to sharpen. 
The first thing to do with our image is to change the mode from RGB colour to Lab colour. Click on Image > Mode > Lab Color. 
If you look at the Channels Panel, you'll see we now have Lab and Lightness channels.Select the Lightness channel and the colour information is taken out of our image. Now we're ready to sharpen without damaging the colour information in the image.  Open up the Unsharp Mask filter by clicking on Filter > Sharpen > Unsharp Mask  The Unsharp Mask dialog opens up and in it we can set the amount of sharpening to apply to our image. The amount slider determines how much sharpening will be applied to the image. The radius slider determines how many pixels around the edges in the image will be affected. The threshold slider determines which pixels are classed as edges and subject to sharpening. The lower the number, the more intense the effect will be. Experiment with the settings until you're happy with the result. Make sure the Preview box is checked so that you can see how the settings affect the image. Click OK when you're happy.
 Now we're going to change back to RGB mode.
 That's all there is to it. Before and after... 
Before sharpening | 
After sharpening |
Discuss this article on the forums. (0 posts) very good i used your method and i found it made a great difference to my shots
thanking you |
