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Photo Restoration Repairing damaged photos

pixelated photos

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Old 09-14-2005, 05:53 AM
margotshp's Avatar
margotshp margotshp is offline
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pixelated photos

Does anyone have idea what cause things like this? [ see attached files ]
70% of photos I'm getting to retouch have the same problem
Attached Images
File Type: jpg Img6463.jpg (78.5 KB, 72 views)
File Type: jpg Img2535.jpg (97.0 KB, 67 views)
File Type: jpg Img13762a.jpg (88.5 KB, 55 views)
File Type: jpg Img12991a.jpg (50.5 KB, 26 views)
File Type: jpg Img7493a.jpg (81.8 KB, 34 views)

Last edited by margotshp; 09-14-2005 at 06:22 AM.
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Old 09-14-2005, 07:50 AM
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Panpan Panpan is offline
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Hi Margot.

Can you be more specific about the problem? I see some very slight posterization on some of them, but that could be from jpeg compression and small size. Other than that, they look like details from professional-level images .

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Old 09-14-2005, 07:55 AM
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margotshp margotshp is offline
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Hey! Thanks for reply...
I think I talk about posterization.
TIFs and RAWs looks exactly the same, it is not caused by compression
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Old 09-14-2005, 10:47 AM
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The first thing that strikes me when looking at the images is that they are dark, very dark. This fact in itself can lead to a degree of posterization.....

I took one of the images (the second one, of course ) and opened up the histogram.
In the blue channel 90% of the values are under 64. So what? Well, you are using only 64 different values instead of 256 (for 8-bit work). If you now lighten the photo to full range luminosity, those 64 different values will be occupying a range of 256, but now they will be spaced out 4 by 4. Which is exactly what posterization is!

Why are they so dark?

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Old 09-21-2005, 08:24 AM
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margotshp margotshp is offline
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Hi Ro

Thank you very much for reply.
Yes, I know those images are very dark, that's how I'm getting them from my employer but I thought that maybe I do something wrong... I guess his camera's settings are bad...
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