Posted by Scott Frye on February 11, 2007 at 4:32 PM
Finished shooting today and when I reviewed my pictures, I found a green haze around this bird.
What causes this?
How can I keep from it happening again?
Can Photoshop fix it?
At times I have gotten a purple haze - same problem?
Posted by Rod Barbee on February 11, 2007 at 4:44 PM
A couple of ideas.
1) oversharpening in the camera?
2) chromatic abberation (color fringing) from the lens. (what's the lens?)
The fix for the first is obvious: don't sharpen as much
The fix for the second is trickier. If you're shooting RAW you can use ACR, click the lens tab, and adjust color fringing.
Posted by Scott Frye on February 11, 2007 at 5:17 PM
Using a Tamron 200-400 zoom with a 2x extender
The picture has not been sharpened with software -- I am uncertain how the camera can oversharpen -- Using a Digital Rebel
Scott, I don't have any help with the color issue although more info, like how were the other images from that shoot, have you seen it before and in what circumstances (e.g. what camera, lens, light, etc.) would probably help those more astute than I. On another note I see a couple of dust spots...you should probably consider cleaning your sensor too.
Posted by Tom Webster on February 11, 2007 at 9:17 PM
Hi ya' Scott,
This is definitely an example of chromatic aberrations. You can look elsewhere and see a purple/magenta color fringe. This just happens to be the color opposite of the green. This, unfortunately, is a property of the lens. Zoom lenses are particularly susceptible to chromatic aberrations and the 2x extender just accentuates the problem. I've never tried to fix chromatic aberrations through software but others may be able to guide you through that.
Posted by Scott Frye on February 11, 2007 at 9:56 PM
Thanks Tom -- Chormatic Abberation seems to be key here. I googled many pages on the net and seems to fit the description. Gotta go back to the water park to reshot this -- might see ya there
Posted by Basil Greber on February 12, 2007 at 7:11 AM
I'd suggest getting rid of either the lens (= replacing it, but this will be expensive) or the converter (= using the lens without converter) - in addition to introducing chromatic aberration, this combination apparently also produces very soft images.
Basil
Posted by Rod Barbee on February 12, 2007 at 1:04 PM
Scott,
are you shooting in RAW? If so, try the Lens tab in Photoshop ACR and adjust the chromatic aberration sliders.
Discussion
7 repliesWhat causes this?
How can I keep from it happening again?
Can Photoshop fix it?
At times I have gotten a purple haze - same problem?
1) oversharpening in the camera?
2) chromatic abberation (color fringing) from the lens. (what's the lens?)
The fix for the first is obvious: don't sharpen as much
The fix for the second is trickier. If you're shooting RAW you can use ACR, click the lens tab, and adjust color fringing.
The picture has not been sharpened with software -- I am uncertain how the camera can oversharpen -- Using a Digital Rebel
This is definitely an example of chromatic aberrations. You can look elsewhere and see a purple/magenta color fringe. This just happens to be the color opposite of the green. This, unfortunately, is a property of the lens. Zoom lenses are particularly susceptible to chromatic aberrations and the 2x extender just accentuates the problem. I've never tried to fix chromatic aberrations through software but others may be able to guide you through that.
Basil
are you shooting in RAW? If so, try the Lens tab in Photoshop ACR and adjust the chromatic aberration sliders.