RayPettit
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Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 9:05 am

Hi,

I'm currently working on an old slide that has a lot of vignetting, in other words, it has a lot of darkened areas around the 'rim'.

The shot is very full frame showing an airliner on approach against an all blue sky - there is very little space between the nose of the a/c and the slide mount!

I'd like to know the best way of improving this pic so I can put the best version possible up on our site. Has anyone any tips that a relative newcomer can master? Is it possible to copy and paste chunks of the blue sky to overwrite the darkened areas or is this problematical when trying to achieve a natural effect, especially when dealing with smaller, awkward areas that need 'joining up'.

Cheers

Ray
 
ckw
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 9:46 am

Tricky one - without seeing the pic, I can't be sure, but I doubt cloning will provide the solution, as it is highly unlikely the the blue tones are constant across the sky.

I'm assuming the vignetting has produced a gradual darkening towards the edges. The way I would tackle this is to create a mask over the correctly exposed section of the image, with a significant degree of edge feathering. Then try lightening the unmasked protion of the image. The trick will be to get the initial mask right and just the right amount of feathering - a bit of trial and error I'm afraid.

I wouldn't class this as a "beginners" technique, but an extremely useful one, so worth spending a bit of time learning.

Cheers,

Colin
Colin K. Work, Pixstel
 
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clickhappy
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 9:55 am

Hiya Ray  Smile

What version of PS are you using? The cloning tool in version 6 is light years ahead of what is found with version 4. Not sure about 5 or 5.5, or even 7, but I assume 7 would be at least as good as 6.
 
photopilot
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 10:33 am

Any chance of "posting" the image somewhere where we can have a look at it. It might also give us a chance to "play" with the image ourselves in our own Photoshop.

Hey..... it's a potential contest! ! ! Let's see who can do the best retouch job Big grin

Steve
 
Shawn Patrick
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 1:44 pm

Hehe, good idea Photopilot!

I've worked with images with vignetting and I was able to get some pretty good results.

If you want, email me the full-res photo (shawnb777@adelphia.net). I have PS7, so I'll see what I can do.

Regards
Shawn
 
mikephotos
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 3:45 pm

IIRC there is a Vignetting "action" or "filter" for PS but I personally haven't used it so not sure how effective it is.

Michael
 
TomH
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 9:28 pm

I have the same problem with some of my older slides, so I'm very interested in the outcome of this discussion. Some of them are typical vignetting like this one


View Large View Medium
Click here for bigger photo!

Photo © Tom Hildreth



while a few others are dark only on one side such as


View Large View Medium
Click here for bigger photo!

Photo © Tom Hildreth

which was from a shutter problem. The solution that works for the first may very well help me with the second, as they appear on the image as similar problems.

Michael, what does "IIRC" mean at the beginning of your 11-04-02 post mean?

 
wietse
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 9:49 pm

Tom,

If I Recal Correctly

Wietse

Wietse de Graaf
 
ckw
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RE: Overcoming Vignetting In Photoshop

Mon Nov 04, 2002 10:45 pm

The vignetting filter in PS is used to ADD a vignette to an image - so not really much help in itself.

However this might be a useful route to create a suitable mask as mentioned above. This can be solved in PS, but it's not easy - as well as masks, you'll have to use layers as well. Cloning on this scale, particularly with film scans is unlikely to be 100% successful, if only because variations in the grain pattern will give the game away. Personally I would find some vignetting preferable to an imperfect fix.

Cheers,

Colin
Colin K. Work, Pixstel
 
lennymuir
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RE: Overcoming Vignetting In Photoshop

Tue Nov 05, 2002 7:30 am

Hi!

I've like this thread. this is something I've been looking at too since I realised my F707 was suffering with DLS (dark left side) slightly. Now I've got my '707 fixed, I don't use this manipulation now.

I used the 'gradient' feature on GIMP for Windows to lighten the left hand side.
It can be used to counteract the darkening effect of vignetting too.

I'm sure the tool is available on Photoshop, you'll just
have to find it and adapt it similarly.

The first photo below is just black.



The second is the gradient applied only to the left hand side.
(Gradients >> Dialogues >> Opacity 50% >> Offset 50% >> Linear >> Lighten Only)
I've heavily enhanced the effect to show you what it looks like on black.
When you apply this gradient to your vignetted pitcures, go easy and start with
minimal values. If you overdo it, it looks really bad an you'll get hue changes.




The third is how the anti-vignetting gradient would look.
(Gradients >> Dialogues >> Opacity 50% >> Offset 50% >> Radial >> Lighten Only)



Get looking into your photoprogrammes and try it out.
I took me a few days to master it.

It is worthwhile.

Cheers

Gerry
 
RayPettit
Topic Author
Posts: 602
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RE: Overcoming Vignetting In Photoshop

Tue Nov 05, 2002 8:11 am

Thanks for your responses so far guys,

Quite a heavy subject and probably not one I fancy trying out after a day at work! Certainly not a ten second job.
BTW, I haven't posted my pic here because I'm a bit unsure about the formatting. I can post it in jpeg, but then I always work my pics in TIF and then convert the file format last thing. I think sending in TIF takes me over the 2 hour timeout connection.

I've only got Photoshop 5 (a cut down version at that) by the way.

Tom, its a shame about the dark side of your Panther - still a stunning shot though!

Ray
 
Shawn Patrick
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RE: Overcoming Vignetting In Photoshop

Tue Nov 05, 2002 9:23 am

Ray, you could send me a compressed version in jpeg format and play around with it, then tell you how to do it yourself on the Tiff version
 
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Jofa
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RE: Overcoming Vignetting In Photoshop

Tue Nov 05, 2002 9:34 am

Try the dodge tool, set it to work on midtones and at a pretty low opacity, lets say 30. Choose a big blurry brush, size 300 maybe. Then carefully "paint" away the vignetting.

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