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Another Photoshop Thread???!!!

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Travis Minnig
Travis Minnig StudiosOffline
August 15, 2008, 02:41:49 PM
OK, I have a very specific problem with this image, so I started another one...  I need to know how to defringe the edge of this shirt.  This is a close crop of a family group shot.  All of them wore blue except this gentleman.  I have changed his shirt color to one that matches another blue shirt in the image closely, but I keep getting this red fringe around this portion of his sleeve.  All the rest of it changed without issue, but this spot is problematic.  The fringe does not go all the way around, just right here.  I did the change on a Hue/Sat adjustment layer and then just masked everything except his shirt.  The area showing through the mask goes beyond the edge of his shirt because the color adjustments I made don't have any effect on the blue shirt behind him, so I know it's not an edge/painting issue.  For some reason the red pixels around his shirt are not changing with the rest of it.  What the heck?  Anyone?  I would like to know why this is the case, so I can watch for it next time, but I also really need to know a couple methods to try and fix it if possible.

Thanks in advance,
Travis
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Mike Hodgson
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Reply #1 - August 15, 2008, 03:23:38 PM
Filter/Distortion/Lens Correction
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Travis Minnig
Travis Minnig StudiosOffline
Reply #2 - August 15, 2008, 05:34:14 PM
Mike, that worked pretty good, but not quite.  By the time I start getting rid of the red, there is a large Cyan one to replace it.  If I then use the Cyan slider, the entire image starts to shift.  Strange, huh.

Anyway, any other ideas?

Travis
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BobEdens
Bob Edens PhotographyOffline
Reply #3 - August 15, 2008, 06:06:49 PM
What did you use initially? and was there any feathering built into your selection tool?

as far as getting rid of the fringe, clone stamp at 500% should do the trick. My thoughts lean toward why they are there to begin with.
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-----------------------------------
"I get up every morning determined to both change the world and have one heck of a good time. Sometimes this makes planning my day difficult. "- EB White

Chattanooga Photographer www.BobEdens.com

Travis Minnig
Travis Minnig StudiosOffline
Reply #4 - August 15, 2008, 06:24:16 PM
Hmmm, I am not being very clear today... I used a Hue/Sat adjustment layer and then painted in the layer mask.  There is no selection made.  I adjusted the Hue/Sat layer set on the Reds until I got the color I wanted in his shirt: Hue -135, Saturation -14, Lightness -80.  Then I filled the mask with black and painted back in his shirt with white on the mask starting with a large brush and a hard edge at 100% opacity and 100% flow.  Then I went to a small brush and cleaned up the edges of the mask with a soft edge, 100% opacity, and 20% flow.  The hue/sat adjustment makes no changes to the blue shirt of the man behind the shirt of concern, so I do not have to be precise on the mask painting in this area.  I can run the center of the brush right over the edge and the fringe does not change.

As for the clone tool, if I clone on the layer below the adjustment layer (which would seem to make sense) the fringe just moves with the edge of the two blue colors still.  So I can push it and pull it around, but not get rid of it entirely.  Strange, I know, but true nonetheless.

Edit:  I didn't notice the 500% instruction, I'll try that.  I didn't realize you could go over 100%, that's also very strange to me.
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Travis Minnig
Travis Minnig StudiosOffline
Reply #5 - August 15, 2008, 06:30:08 PM
Note to Bob, you can't use the clone stamp at 500%.  I will assume you meant 50%.  Also, I merged the adjustment layer with the underlying layer and the clone tool worked fine.  I lose the ability to go back to that adjustment layer later, but it should be all right in this case anyway.  Thanks for the help guys.
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Travis Minnig Studios

Mike Hodgson
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Reply #6 - August 15, 2008, 07:12:30 PM
This is what I did.

I used the laso tool and only selected around the fringe, and used Hue/Sat which looked liked this.
Now, this is working on your post, you'll have some tweaking to do on your original. Hope this idea helps.


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Travis Minnig
Travis Minnig StudiosOffline
Reply #7 - August 15, 2008, 07:20:39 PM
Thanks again Mike, I'll try that as well.
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Ginnypenny
Charles Barnard PhotographyOffline
Reply #8 - August 16, 2008, 10:25:38 AM
Well Mike mentioned what I would have done with the lens correction menu.  The other thing I was going to suggest may have been mentioned, but I didn't understand it.  I'll explain anyway.  I get abberations around bride's white dresses when I am forced to shoot in the sun.  Usually cyan though, sometimes magenta.

If you used a funky masking layer thing to color the shirt you might have to flatten the image for this to work.  Roughly select the area around the red fringe, go to hue/sat and select magenta and drop the opacity, you might play with the hue if the grey looks bad. 

I don't know, you guys mentioned hue/sat, so maybe that's what you meant.  With just a small area you might just use a clone stamp around that edge like Bob mentioned.
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Susie
www.charlesbarnardphotography.com
www.definitionimages.com

Travis Minnig
Travis Minnig StudiosOffline
Reply #9 - August 16, 2008, 11:07:21 AM
Thanks guys, I did use the clone stamp.  The selection around the fringe would have worked as well.  It was the Merging of the adjustment layer and the one below it I was missing.  If you don't do this, the fringe just kept moving in and out on the edge.  Once I merged them, all these options became available and useful.

Thanks
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Mike Hodgson
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Reply #10 - August 16, 2008, 08:26:35 PM
Uhmm Susie, Hue sat, you did not see the image?   Big Grin   Big Grin
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Ginnypenny
Charles Barnard PhotographyOffline
Reply #11 - August 16, 2008, 09:01:43 PM
Quote from: Mike Hodgson on August 16, 2008, 08:26:35 PM
Uhmm Susie, Hue sat, you did not see the image?   Big Grin   Big Grin

Weird, no I didn't, sorry!  On my laptop the image won't display, but on my desktop there it is!  That's why I didn't understand your post and explained the same thing.
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Susie
www.charlesbarnardphotography.com
www.definitionimages.com

Aqualuna
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Reply #12 - August 17, 2008, 12:12:36 AM
Travis, check this:

http://en.wikipedia.org/wiki/Purple_fringing
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Travis Minnig
Travis Minnig StudiosOffline
Reply #13 - August 17, 2008, 01:20:36 AM
Aqualuna,  Thanks for the link.  It certainly has some great information about this phenomenon.  I especially like the article from Pictureline.com it links to.  (J/K, Pictureline is a local company that I love, so I'm giving them a plug).

Unfortunately on this image, it doesn't help a whole lot.  There is a possibility of it being my lens, but it's a pretty good one; Nikon 24-85 f/2.8-4.0.  Not the top end one in its range, but not the bottom either.  Also, I shot at 1/125s and f/8, so the lens wasn't open beyond the its best performance range.  I did use ISO400, so that could be part of the issue.

Regardless, it's great information and I appreciate it very much.

Travis
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Aqualuna
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Reply #14 - August 17, 2008, 10:34:11 AM
If you really would like to study the phenomena, I would try a few things:

- Use same lens with 2 diffrent cameras, with same lens setting, and see if there is any change in he resulting image.

- Try different lens at the same lens setting (f, focal lenght, focus) with one camera.

- Check if this effect is visible in the viewfinder.

- try to make small changes in the camera and lens setting and see how they affect the fringing.

- make small changes in the scene (like lighting, background, etc), and see how the affect the fringing.

- seems the fringing is "directional", what happens if you rotate the camera? i would expect it to rotate the fringign too, unless thre is somehting in the scene and lighting thats causing it to have an "upper" direction in the pic you posted...

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