purple fringing

aztec

aztec

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Name
Shaun
Edit My Images
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May be a daft question but what is the best way to eliminate purple fringing on pictures using photoshop.
 
This is something I downloaded ages ago. It works ok for me...

Start by loading up the affected image. Now select Image/Adjustments/Hue-Saturation. [In Photoshop Elements 2, select Enhance/Adjust Color/Hue-Saturation; in Paint Shop Pro 8 select Adjust/Hue & Saturation/Hue-Saturation-Lightness].
Ok, here's the important step: click the blue channel. Do not adjust the master channel. PhotoShop takes the guesswork out of the HSL adjustment step. When the blue channel is selected, the eye dropper tool on the HSL dialog will become available. Click the leftmost eyedropper and use it to sample the purple fringe in your image. Then reduce the saturation; somewhere between -70 and -80 is usually about right, but you'll need to do this by eye as every inage is different. You can use the colour slider at the bottom (between the two color bars) to make finer adjustments.
Finally, you may find the image needs some minor tinkering and will probably appear a little washed out. Making fine adjustments to the Brightness/Contrast or Levels settings will correct these problems.
 
Bill Roberts said:
This is something I downloaded ages ago. It works ok for me...

Start by loading up the affected image. Now select Image/Adjustments/Hue-Saturation. [In Photoshop Elements 2, select Enhance/Adjust Color/Hue-Saturation; in Paint Shop Pro 8 select Adjust/Hue & Saturation/Hue-Saturation-Lightness].
Ok, here's the important step: click the blue channel. Do not adjust the master channel. PhotoShop takes the guesswork out of the HSL adjustment step. When the blue channel is selected, the eye dropper tool on the HSL dialog will become available. Click the leftmost eyedropper and use it to sample the purple fringe in your image. Then reduce the saturation; somewhere between -70 and -80 is usually about right, but you'll need to do this by eye as every inage is different. You can use the colour slider at the bottom (between the two color bars) to make finer adjustments.
Finally, you may find the image needs some minor tinkering and will probably appear a little washed out. Making fine adjustments to the Brightness/Contrast or Levels settings will correct these problems.
Click to expand...

Hell of a lot easier if you have my option on photoshop, all you do is move the chromatic aboration sliders.
 
ki_user said:
Hell of a lot easier if you have my option on photoshop, all you do is move the chromatic aboration sliders.
Click to expand...

Oh believe me if there's a hard way of doing something I'm a natural :)
 
thanks for all advice especially chromatic aboration sliders., if only I knew were half of these buttons sliders are :) have cs4 but not used it in anger much ps were are the chromatic aboration sliders.
 
IIRC purple fringing is a different form of chromatic aberration to that which is correctable in PS. I've probably got this wrong, but IIRC purple fringing is caused by longitudinal CA, whilst red/green or blue/yellow by transverse CA.

Desaturating/darkening the fringe in the approach Bill mentioned is probably the best way to go about it. I do the same but mask it so only the affected edges have the effect applied.
 
just to let you know the image I am trying to alter is a high contrast image of a bird in flight where around its wings the CA is must noticeable against the sky,the other thing about trying to process this image is that it was taken in the raw format but I only have 3 tabs on left hand side of the raw panel where their should be 8 according to a book I was reading? sorry for all the questions:bang:
 
Sadly PS Elements has a limited version of Adobe Camera Raw [unless you're on version 8 for the Mac, like me!] which has only those three tabs compared to its big brother. Sucks really, but the price is right!

Another tool you may wish to consider getting is the PTLens plugin; it features automated lens correction for many lenses and allows for CA aberration manually as well. Cheap too!
 
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