Go Back   Steve's Digicams Forums > Digicam Help > Tips & Tricks

Thread Tools Search this Thread
Old Jul 6, 2006, 6:26 AM   #1
Senior Member
Join Date: May 2004
Posts: 339

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.
Attached Images
blr is offline   Reply With Quote
Sponsored Links
Old Jul 6, 2006, 10:03 PM   #2
Senior Member
Join Date: Jun 2005
Posts: 804

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.

granthagen is offline   Reply With Quote
Old Aug 27, 2006, 12:21 AM   #3
Join Date: Jul 2006
Posts: 94

Thanks blr - I've been searching for a quick fix & this works great with Photoshop CS.
SportShotsLive is offline   Reply With Quote
Old Aug 27, 2006, 8:14 AM   #4
Senior Member
bkrownd's Avatar
Join Date: Jun 2006
Posts: 106

blr wrote:
Once again, sorry if this is well known.
Thanks for posting an example for us noobs.
bkrownd is offline   Reply With Quote
Old Sep 18, 2006, 9:47 PM   #5
Senior Member
Join Date: Aug 2006
Posts: 822


Now I've got to go try it out.

kenbalbari is offline   Reply With Quote
Old Oct 29, 2006, 6:40 PM   #6
Senior Member
Join Date: Jun 2002
Location: Victoria, B.C., Canada
Posts: 852

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 -

Attached Images
Herb is offline   Reply With Quote
Old Oct 31, 2006, 10:55 AM   #7
Senior Member
Join Date: Oct 2006
Posts: 197

Thanks for the tip I'm just learning photoshop!
Sneezy1956 is offline   Reply With Quote
Old Nov 1, 2006, 5:34 AM   #8
Senior Member
jachol's Avatar
Join Date: Aug 2006
Location: NW. England
Posts: 1,196


Thanks for the info... nowI need to find a picture to try it on ... Jack
jachol is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 9:34 PM.