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12-07-2015, 03:05 PM   #1
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Sky pixelated - k-5 II

Hi there,

Here is a picture i have taken few days ago.

Name:  _IGP0459.jpg
Views: 346
Size:  208.1 KB

I shooted RAW and export it 100% jpeg as i usually do, but on this particular image I see a lot of banding and a pixelated background (sky)

When i look at it at 100% in Lightroom i don't get the problem.

Do you guys have an idea of what can be the cause of it ?


Last edited by Meg4mi; 12-07-2015 at 11:47 PM.
12-07-2015, 03:09 PM   #2
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No picture that I can see..........
12-07-2015, 03:11 PM   #3
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No photo...
12-07-2015, 03:34 PM   #4
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The same happens to me. Its just in the preview. No need to worry.

12-07-2015, 11:50 PM   #5
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QuoteOriginally posted by Markovo Quote
The same happens to me. Its just in the preview. No need to worry.
I have added the picture to the thread another way.

The pixelation is very visible if i set this picture (full size, 9MO) as my wallpaper. Not only in the preview(in LR).
12-08-2015, 03:14 AM   #6
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Remember that JPG photos are limited to 256 colour variations per colour channel. Each colour channel is 8-bits for a total of 256 colours.

RAW for a K-5 series camera is 14-bit. This gives 16,384 colours per colour channel.

Where there is a fine gradation in colours, as in your night sky photo, you will more likely the banding in the JPG file because colours are limited to 256 variation per colour channel. With 14-bit RAW this banding is seldom scene.

Regards

Chris
12-08-2015, 05:28 AM   #7
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As noted above, some of these problems are inherent in the jpeg format. We use it because it generally gives acceptable quality for computer monitor viewing and a small file size. A lossless format with greater color depth will give more faithful reproduction but at the cost of a very large file footprint. There is likely nothing wrong with either the camera or the lens; you were just unlucky enough to get a shot that exposes the weaknesses of the jpeg format.
12-08-2015, 08:26 AM   #8
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Another approach

What quality setting are you using in Lightroom? That will make a lot of difference--more than the size setting. You could also try exporting it from Lightroom to a lossless format (TIFF) and converting it to JPEG at high quality with another program, just to see what happens.

12-08-2015, 01:16 PM   #9
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QuoteOriginally posted by Meg4mi Quote
Hi there,

Here is a picture i have taken few days ago.

Attachment 290623

I shooted RAW and export it 100% jpeg as i usually do, but on this particular image I see a lot of banding and a pixelated background (sky)

When i look at it at 100% in Lightroom i don't get the problem.

Do you guys have an idea of what can be the cause of it ?
I don't see any trouble here... But I can think of one idea.
Once you export the JPG, do you edit it further? If you do, that could lead to posterization, most visible on smooth backgrounds, such as skies, and on noisy parts of images (such as dark skies).
12-09-2015, 12:04 AM   #10
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QuoteOriginally posted by dakight Quote
As noted above, some of these problems are inherent in the jpeg format. We use it because it generally gives acceptable quality for computer monitor viewing and a small file size. A lossless format with greater color depth will give more faithful reproduction but at the cost of a very large file footprint. There is likely nothing wrong with either the camera or the lens; you were just unlucky enough to get a shot that exposes the weaknesses of the jpeg format.
Maybe you right and i've been unlucky. (but that's the first time i see it)

Editing only the raw file and export it as 100% jpeg quality.
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