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Bad Gradation at shadow area

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  #1  
Old 01-24-2014, 07:32 AM
workharder workharder is offline
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Bad Gradation at shadow area

Hi Guys,

I need some technical help here:
How to make smooth shadow gradation in low key photos.
I want to darken the area but the result is like that, imperfect and unsmooth gradation, it looks like low res image (sample attached, taken from original image, 100% cropped)

adding noise is not an option for it (or at least it is the very last option).
I ve try frequency separation but it still there or I did it wrong?

thanx before

-Nof
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File Type: jpg shadow-gradation-sample.jpg (79.3 KB, 86 views)
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  #2  
Old 01-24-2014, 02:36 PM
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Tony W Tony W is offline
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Re: Bad Gradation at shadow area

Are you the photographer as you mention this is a crop of the original?

If you are the photographer then you should be having a look at the original raw or TIFF as this was taken with a quality system and should not be displaying this banding.

If this been pulled from another resource as an 8 bit file and maybe edited in a 16 bit colour space it could explain the problems.
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Old 01-24-2014, 05:03 PM
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andrewrodney andrewrodney is offline
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Re: Bad Gradation at shadow area

It's also possible the banding you see is the result of the display, not in the file itself. But before we go there, it would be useful to answer Tony's questions because yup, it could certainly be the data.
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Old 01-24-2014, 05:48 PM
umutyildiz umutyildiz is offline
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Re: Bad Gradation at shadow area

filter/noise/median and go masking!
or
blur/surf.blur and go masking.
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Old 01-24-2014, 10:03 PM
skoobey skoobey is offline
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Re: Bad Gradation at shadow area

First of all is it an 8 bit file?

Then, having texture makes it look natural. With no texture, you'll have either a blurred looking, or a chopped looking image.

It's the small detail that gives image the appearance of photo-realism.

This kind of loss of detail occurs sometimes when the underexposed/overexposed file has been pulled to correct it, and then the heavy noise that would result in an area was removed, giving you an overly smooth gradient.

I'd recommend rebuilding the texture either from another shot in the series, or from another image that is as similar as possible. Split frequency and working on top layer, of course.

Boy, does that perspective warp come in handy on this one.
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Old 01-24-2014, 11:20 PM
workharder workharder is offline
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Re: Bad Gradation at shadow area

Hoo.. thanx guys Love this forum
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  #7  
Old 01-25-2014, 03:02 AM
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Tony W Tony W is offline
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Re: Bad Gradation at shadow area

Would you care to answer the questions posed in post #2 to enable some help to be offered?
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Old 01-25-2014, 08:59 PM
workharder workharder is offline
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Re: Bad Gradation at shadow area

Ough sorry I forgot to answer it.. hehehe

No, It isn't my photo, but I knew the photographer. It taken with P45, raw processed on Capture One Pro 8 bit TIFF.

I feel it like broken gradation when I darken that spot... it supposed to be nice and smooth.
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Old 01-26-2014, 09:14 AM
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Re: Bad Gradation at shadow area

I may be wrong as I do not have access to this back which was a Phase One P40+ but I assumed that output would be 16 bit either TIFF or as Phase One raw IIQ.

As the file is 8 bit TIFF it may not be the original and may have been worked on prior to you receiving it and converted to 8 bit. WIth such expensive gear the assumption would be that the original would be acquired in the best quality i.e. 16 bit raw and only converted to 8 bit once image optimised and ready for output - hence my questions.

Do you have permission to use the photographers original file as the copyright and terms of use belong to him even if published on the 'net'?

Is this image a grab from the internet?

Is the image you show here the original file as received without any edit manipulations from you?

If you are trying to edit this file are you doing such in 16 bit - this could prove to be a mistake assuming that the original or the file you have does not already have the banding baked in?

With a correctly exposed image it can be quite difficult to produce the banding you see unless you are making huge changes or trying to make changes to an 8 bit file and using 16 bit.

As presented this image is not really a retouching project but more of a full blown restoration project to replace the damage to the file however caused.

If this is just a practice piece for beauty retouch dont waste your time. Find another to work on ideally a full blown raw file or a 16 bit file. You will not/should not be presented with such poor quality originals by a pro.

If you really have to make this better then try the methods suggested earlier or repair the individual RGB channels to hide the banding, or try and do the same with the composite channels on a layer using Luminosity blending and consider the patch tool a possible contender to disguise the bands and also bring a little texture back. Then deal with any colour issues arising from these moves
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  #10  
Old 01-26-2014, 09:26 PM
workharder workharder is offline
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Re: Bad Gradation at shadow area

Hi Tony,

I do have permission using the original file, I got it directly from him, but he said don't upload it full frame, just cropped at the problems area.
The image that i attached here is the "after" file.
I will upload the comparison before - after soon later.

Maybe I will try to rework it on 16bit, but I have to start over from the beginning... (so sad)

Thanx a lot


-Nof
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