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Photo Restoration Repairing damaged photos

removing the haze from aerial photos

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  #1  
Old 07-12-2002, 01:13 PM
Becky Becky is offline
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Question removing the haze from aerial photos

Does anyone have any suggestions for removing the haze from aerial photos? The only day the photographer could go up in the airplane, the temperature was about 95 degrees with 90% humidity. This was at 8:00 in the morning! Needless to say, there is quite a bit of haze in the shots. I have tried selecting the blue channel, and replacing it with a corrected blue channel, but it still was hazy. Using PS 7 on windows 2000.

Thanks in advance!

Becky
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Old 07-12-2002, 01:14 PM
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Doug Nelson Doug Nelson is offline
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Can we see an example?
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Old 07-12-2002, 01:51 PM
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jeaniesa jeaniesa is offline
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Becky,

Welcome to RetouchPro! It would help to see an example, but I think I know what you are talking about, since my husband came home from the Philippines with some arial shots of Mt. Pinatubo that were washed out because of haze. My immediate reaction was, "Gee - would have been nice if you'd had a polarizer filter when you took the pics." So, I went looking for a PS filter that would act as a polarizing filter after the fact. As it turns out, what I found helped some, but weren't perfect. But, in the hopes that it might help you, here's what I found:

Free action at:
http://www.digitalsecrets.net/secrets/polarizer.html

Nik Color Efex Pro! Photo Design Set (free demo; $99.95 to buy):
http://www.nikmultimedia.com/usa/pro...esignset.shtml

I have a vague memory that I had a third reference, but I can't seem to find it. Sorry.

Also, if things look really washed out, you might try duplicating the layer and changing the blend mode to multiply (adjust opacity as needed).

Good luck! (And if you are able to attach an image, I might have some more ideas after looking at it.)

Jeanie
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Old 07-12-2002, 02:47 PM
Becky Becky is offline
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Thanks for the welcome, Jeaniesa.

Here are a couple of samples.

http://www.ksu.edu/ksuphoto/hazy.htm

I will try your suggestions also.

Thanks!
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Old 07-12-2002, 03:08 PM
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Doug Nelson Doug Nelson is offline
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I had limited success apply a duplicate layer in multiply mode, then a curves layer with a gradient blend layer mask.
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Old 07-12-2002, 03:47 PM
Becky Becky is offline
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Doug,

I used the method you suggested, and put it pack on the web site. I used one layer, multiplied at 100% with the gradient mask going from bottom to top. The gradient was 50% gray to 100 % white. Then made duplicate layer of that, set to multipliy at 19% with gradient from bottom to top, 100% black to 100% white to darken the top more without adding anymore contrast to the trees at the bottom.
That seems to work pretty good, but we are hoping that the photographer can go back up on a less hazy day!

Thanks for you help.

Becky
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Old 07-12-2002, 04:53 PM
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That actually looks better than the one I did
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Old 07-12-2002, 05:17 PM
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jeaniesa jeaniesa is offline
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You seem to have figured things out pretty well Becky. I don't think I can improve on what you've done!

Jeanie
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  #9  
Old 07-13-2002, 07:50 PM
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Flora Flora is offline
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Becky

Hi and welcome to RP!

For your "hazy" picture, after correcting the colour using the Curves, I did exactly what Doug did but I repeated it several times applying the gradient to strategic points of the mask.
Here is the result I got:
Attached Images
File Type: jpg hazy_b&a2.jpg (98.3 KB, 161 views)
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  #10  
Old 07-13-2002, 08:54 PM
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jeaniesa jeaniesa is offline
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WOW!! That's amazing Flora! Good work!

Jeanie
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