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Old Jul 6, 2006, 6:26 AM   #1
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I don't know if this has been discussed before, I think there was a topic a couple of years back, but I decided to post anyway. Sorry, if this is old news.

This is an easy way to remove the purple fringing (chromatic aberation) that usually appears around blown highlights. It is easy in the way that it doesn't involve masking. Instead what I usually use is the hue saturation tool in PS.

Here is how it works.

1. Zoom to 200%

2. Go to Image/Adjustments/Hue Saturation

3. Select one of the channels. Depending on the color of the fringe this can be blues, greens etc. Which cannel is selected does not matter much since PS will chane it automatically (see below).

4. With the eyedropper tool click on an area that has an intensive fringing. You will notice that at the bottomof the Hue/Saturation tool window the corresponding color range is selected. You can make it broader or narrower using the small bar sliders on the color scale at the bootom. Making it broader will likely affect other colors in the image, so be careful.

5. Now, start adjusting the hue slider until the hue of the fringe matches the hue of the object it is bleeding into. For instance, purple fringing around green leaves needs a positive hue correction. Next, decrease the saturation to -25, -50. Finally adjust lightness for the best match. Click the preview often to see the results.

6. Apply the filter, zoom out and undo/redo to see if other colors are affected. If yes, try to repeat with a narrower color range. Most of the time it is OK.

7. The procedure may be repeated to remove multiple color bands.

Below is a before/afterexample. This is a 100% crop from a 6 MP image. The correction was done in two stages and took about 5 min to complete. Not 100% perfect, but much better than the original and unnoticable on A4 print.

Once again, sorry if this is well known.
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Old Jul 6, 2006, 10:03 PM   #2
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Thanks for the tip.

I remember a rather involved discussion of this a number of months ago, but I don't remember seeing any systematic approach to "fixing" it.

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Old Aug 27, 2006, 12:21 AM   #3
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Thanks blr - I've been searching for a quick fix & this works great with Photoshop CS.
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Old Aug 27, 2006, 8:14 AM   #4
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blr wrote:
Once again, sorry if this is well known.
Thanks for posting an example for us noobs.
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Old Sep 18, 2006, 9:47 PM   #5
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Now I've got to go try it out.

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Old Oct 29, 2006, 6:40 PM   #6
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You can get pretty well the same result using Photoshop Elements 2.

Go to Enhance, then to Adjust Color and then to Replace Color.

When you get to Replace Color, use the Fuzziness, Hue, Saturation and Lightness bars to get the effect you want.

I just did that with BLR's example, & adjusted the left-hand picture. Here's the result -

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Old Oct 31, 2006, 10:55 AM   #7
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Thanks for the tip I'm just learning photoshop!
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Old Nov 1, 2006, 5:34 AM   #8
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Thanks for the info... nowI need to find a picture to try it on ... Jack
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