You may have heard the term purple fringing, and it can become evident when you view a high contrast image at 100%, this fringing may appear purple, blue and even magenta or other colours, purple fringing most used term.
Usually this is caused by low light against high contrast areas in an image, the fringe colour range is a fairly narrow band and can be removed in Photoshop.
Lets look at this image of an eagle landing on the trainers gauntlet, the sky is bright against the low light of the eagle.
The blue fringing is not that evident so we need to zoom to 100% actual pixels.
Now we can clearly see the blue fringing where the eagles wings meet the sky.
Select from the menu Image > Adjustments > Hue/Saturation
Select the blue channel from the dialog dropdown channel list
Now select the Eye-Dropper on the left
With the Eye-Dropper click on the area of blue fringing
Now just adjust the saturation to around -60 to –80 the blue fringing will disappear.
And now you can do any other adjustments and save the image with a new name.
