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Old Apr 18, 2010, 8:32 PM   #1
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Default Blotchy color on suit

Here's a crop of a gentleman's suit that shows some irregular coloration. It really pops in the print - quite annoying. Any ideas as to what causes this and how to fix it?

Thanks

Jim
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Old Apr 18, 2010, 11:40 PM   #2
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i can see it clearly maybe it is light on some of the fibres? as for curing it have you tried cloning the original in the areas that are most affected it would be pointless me trying on the crop version. maybe one of the more advanced users know a better fix?
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Old Apr 18, 2010, 11:59 PM   #3
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what does the original picture look like.

you may be able to mask off the affected parts and desaturate the affected color channels. especially since its on black.
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Old Apr 19, 2010, 2:25 AM   #4
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What camera were you using? It looks the kind of effect that high ISO on point and shoots cause. Ditto to the whole shot to be of help.
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Old Apr 19, 2010, 4:26 AM   #5
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It is very low frequency chroma noise...
-Shoot in RAW, the JPG is *very* poor quality
-Use a good conversor like Lightroom 3/ACR 6, C1, Rawtherapee, RPP(OSX)...
-Neat Image is very good for dealing with very low frequency chroma noise


For this JPG image, duplicate the layer, change to 16 bit, change to LAB mode, apply
median filter(+- 44) to channel A and B, go back to RGB mode, 8 bit and paint/mask the affected areas...
Or just simply make a B&W photo


BTW, the white balance is not right, there is a cyan cast in the blacks.
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Old Apr 19, 2010, 6:14 AM   #6
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The phenomenon is unique to the suit - the lady next to him was in a black dress and it looked good. Not to say there isn't a cyan cast - this crop is before any modification. I'll post a full view when I have a little more time later today...
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Old Apr 19, 2010, 10:16 AM   #7
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Worsted wool is made from an assortment of textiles hence the color tones. I agree with Hards80
You would have to mask off the areas and use the color channel mixer to reduce the color
cast so that the printer doesn't emphasize it when comes to printing out the photo's.

Dye sublimation and ink-jet printers may show up differences as well with that color cast

Last edited by musket; Apr 19, 2010 at 10:36 AM.
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Old Apr 19, 2010, 11:14 AM   #8
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Default Here's a more complete image...

I cut their heads off since I didn't ask for a model release, but this should do.
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Old Apr 19, 2010, 9:02 PM   #9
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Default OK Then...

I selected the suit and 'created a new layer by cutting', then I sucked the blue out. That's as close as I could come to following your instructions. I killed the color of the suit, but it made a great print. The other idea, to make a B&W out of it, was tempting. I'd shoot in RAW if I could only use the files. I have a T2i and PSE has yet to modify their translation system to make use of it.

Thanks for all the help!

Jim
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Old Apr 20, 2010, 4:55 AM   #10
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Quote:
Originally Posted by iowa_jim View Post
I'd shoot in RAW if I could only use the files. I have a T2i and PSE has yet to modify their translation system to make use of it.
Jim:

Adobe has a new Camera Raw 5.7 Release Candidate you can try that supports the T2i. See this page:

http://labs.adobe.com/wiki/index.php/Camera_Raw_5.7

Use the instructions for Camera Raw 5.6 to install it (other than you'll use the download link from the 5.7 page instead):

http://kb2.adobe.com/cps/407/kb40734...20on%20Windows
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