Banding/pixellation


michaelblue

Link Posted 01/06/2014 - 11:47
Can anyone help here please?
I've noticed this banding on my latest photos, zoomed in it looks like pixellation. I would expect this on a resized Jpeg but not on the original RAW file surely?





A crop from the image:



I've not noticed this before. Any help would be much appreciated

These have not had any processing except for resizing from the original RAW files. They show this banding on the canmera screen too
Regards,
Michael
My new website:link

ChrisA

Link Posted 01/06/2014 - 12:20
This sort of thing is very common with some JPG conversions, but if you're seeing it on the LCD as well, it's very strange.

Banding is also common with a partially burnt out sky - blue, cyan, white are typical, but there's no evidence of this.

What's the camera, what were the settings?

And if you can put the raw file somewhere downloadable, it would be interesting to take a look.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Last Edited by ChrisA on 01/06/2014 - 12:21

michaelblue

Link Posted 01/06/2014 - 12:59
I'm using a K5, 640th sec. @ f7.1 ISO 200

Contrast highlight adjustment - minus 2
Fine sharpness adjustment - plus 2
All other adjustments as default

I'm viewing it in Fastsone image viewer

Where could I put the RAW file for downloading?
Regards,
Michael
My new website:link

ChrisA

Link Posted 01/06/2014 - 13:04
michaelblue wrote:
I'm viewing it in Faststone image viewer

Thought as much... that has been cited as causing this sort of thing before.

See this thread, for instance.

Are you absolutely sure it's visible on the camera LCD?
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
.

michaelblue

Link Posted 01/06/2014 - 15:45
Chris,
I've uploaded the Raw file as you requested.

Yes, It's DEFINITELY visible on the camera LCD

Thanks for the link, I'll have a look now.......
Regards,
Michael
My new website:link

JAK

Link Posted 01/06/2014 - 15:51
Whatever banding you're seeing in those - I can't see it!
John K

michaelblue

Link Posted 01/06/2014 - 15:58
Aha! very intersting!
I opened the image in Lightroom and....No banding!

...but I don't understand why it's visible on the camera screen
Regards,
Michael
My new website:link

ChrisA

Link Posted 01/06/2014 - 16:07
michaelblue wrote:
Aha! very intersting!
I opened the image in Lightroom and....No banding!

Yes, definitely not in the DNG.

For those that can't see it, try saving it and compressing the levels together - it's a lot more obvious.
Quote:

...but I don't understand why it's visible on the camera screen

Well it's not the DNG that you see. It must have all kinds of processing done to it, and if you can see it, that processing must be very lossy.

I'll post a link to the DNG later if anyone's interested, I have to go out now.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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dougf8

Link Posted 01/06/2014 - 16:18
JAK wrote:
Whatever banding you're seeing in those - I can't see it!

I can, grab the scroll bar and move them up and sown the screen, you'll see them go up and down.
Lurking is shirking.!

ChrisA

Link Posted 01/06/2014 - 22:25
JAK wrote:
Whatever banding you're seeing in those - I can't see it!

Faint in the originals, obvious if you take the images and compress the levels:







There's nothing untoward in the original DNG, apart from a couple of bits of crap on the sensor, so I think the clear culprit is Faststone, as it was in Mike-P's case.

PS I'll leave the DNG hosted for a day or two, then delete it.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Last Edited by ChrisA on 01/06/2014 - 22:26

alig

Link Posted 01/06/2014 - 22:28
I'm sure the image on the LCD screen is an in camera JPEG, the screen can't show the RAW image.
(I could be totally wrong but sure read/heard it somewhere)

That's why you'll see it on the LCD, and not in Lightroom during RAW processing.

Get Lightroom and enjoy 😉
Cheers

Ali

ist* DS & Ricoh GR

Smeggypants

Link Posted 01/06/2014 - 22:59
alig wrote:
I'm sure the image on the LCD screen is an in camera JPEG,

yes it'll be the preview image

Quote:

Get Lightroom and enjoy 😉

Couldn't agree more
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

stevejcoe

Link Posted 02/06/2014 - 08:51
I imported the DNG into CameraRaw and agree with Chris that there is no obvious sign of banding, however if you take the exposure down (-1) banding is clearly visible.

To me the image looks underexposed, so could it be a combination of underexposure and the lossy compression of the preview?

Regards - Steve

michaelblue

Link Posted 03/06/2014 - 05:33
Thanks all for your help.

I have now got Lightroom 4 and it looks fine there.

I thought for a moment there was something wrong with the K5!

I've also delved into the 'Settings' of Faststone and changed the 'View RAW files in' setting to 'Actual size (slow)' and the banding has gone. Hopefully this will help others having this problem

Many thanks again!

Ps: I've looked it up and... yes it is a compressed jpeg we see on the camera LCD
Regards,
Michael
My new website:link

alig

Link Posted 03/06/2014 - 10:49
Glad you got it sorted Michael.

No stopping you now with Lightroom.
Cheers

Ali

ist* DS & Ricoh GR
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