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Blotchy sky driving me nuts

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  #1  
Old 03-01-2010, 05:34 PM
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Bulldoggie Bulldoggie is offline
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Blotchy sky driving me nuts

I'm stumped. Tried blurring in RGB, cranking up noise reduction settings in DFine, using the healing brush, and blurring only the Red in RGB space - none of them worked. The C in CMYK wasn't as "good" as the red in RGB, so I didn't mess with it. In Lab no channel did a good job showing the problem. I'm not keen on replacing the sky, but have no clue what to try next.

Attachments: one is the entire image, one is a full res sample showing the problem (taken from the upper left).
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File Type: jpg Full_Shot.jpg (85.4 KB, 92 views)
File Type: jpg Full_Res.jpg (82.7 KB, 106 views)
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Old 03-01-2010, 06:04 PM
mushmush mushmush is offline
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Re: Blotchy sky driving me nuts

Hi BullDoggie- I can't quite see the issue so well with the smaller size files.
You did say the Luminosity channel seems to show the issues most apparently.
I would ::
1) Convert to LAB
2) select the sky and make it it's own layer
3) duplicate that layer
- on this top duplicate layer-- select the layer (select/load/transparency)
Then I would work in just the L channel and blur
I would try a few different types of blur- can't tell which works best by these samples
Hopefully this would help- then convert back to RGB- don't flatten
Set that top layer blending mode to Luminosity
Now your gonna have some color shift- you may have to copy that middle layer again- select same as before - set blending mode to Color- and blur that a little- maybe some curve work to get that color to where you like it
Best wishes
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Old 03-01-2010, 09:08 PM
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chillin chillin is offline
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Re: Blotchy sky driving me nuts

I've added some noise & use surface blur.
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File Type: jpg Full_Res_chillin.jpg (165.8 KB, 51 views)
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Old 03-01-2010, 10:09 PM
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mistermonday mistermonday is offline
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Re: Blotchy sky driving me nuts

The R channel is the worst. You have some normal luminosity and then a big chunk of the adjacent area has been clipped to 0. Where its zero it becomes very difficult to blend or dodge. The other two channels have a fair amount of harsh transitions. Do you have the RAW file? If not, you might want to select the sky and blur it with gaussian or surface blur. You could also just replace it completely.
Regards, Murray
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Old 03-01-2010, 10:34 PM
duwayne duwayne is offline
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Re: Blotchy sky driving me nuts

Duplicated the background layer and applied Filter->Noise->Median=6. Used a layer mask to isolate the sky.
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Old 03-02-2010, 06:22 PM
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Bulldoggie Bulldoggie is offline
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Re: Blotchy sky driving me nuts

Went back to the raw file - there was a major move that significantly "enhanced" the blotchiness. Took the raw file into DFine before adjustment and did noise reduction selecting the blotchy areas. That did the trick.

I'll put the median into my bag of tricks. I've never used median filters with a size that large, so it didn't even occur to me. Thanks!
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