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kevinschoenmakers · 05-20-2010, 11:17 AM

See this picture (clickable for fullsize):

About two-thirds down the way there is a blue line accross the frame. Is this a banding issue? I've never really read up on this, only heard the term come by once. What is it, what can be done? Could it be this is just because the sensor was hot (I had been shooting continuously for a long time when I took this photo)?

Help much appreciated!

testuser · 05-20-2010, 11:24 AM

Sure looks like it to me! I'm assuming it's taken at high ISO too, right? What camera?

kevinschoenmakers · 05-20-2010, 11:39 AM

Yes, ISO 1600 on a K10D. I just tried another ISO1600 shot, and there was no such line, so I guess, luckily, it only shows up after heating up...

Marc Sabatella · 05-20-2010, 02:12 PM

Well, it's an issue, but it's not what people usually call "banding". That would be a much broader, fuzzier band - and usually vertical - where the noise inherent at high ISO forms a visible pattern.

wlachan · 05-20-2010, 03:05 PM

Vertical banding for sure, but not quite severe considered it's iso1600. Every camera body is different given the same model. First thing to check when buying any new camera. Also, there is a horizontal line which is more disturbing. They will be quite visible if you check the blue channel in photoshop.

Marc Sabatella · 05-20-2010, 03:24 PM

The horizontal blue line is what I was referring to when I said this was not "banding" in the usual sense. If there is a slight amount of vertical pattern to the noise as well, it's pretty subtle in this example - I've seen cases where it was compeltely obvious even at screen size.

kevinschoenmakers · 05-20-2010, 03:48 PM

I guess with a little imagination you could say this photo has some vertical patterns in the noise, but it's not obvious so it's not important. The horizontal line is the what I meant indeed. I hope it doesn't show up too often because then I might feel inclined to spend money on a new body (oh no, imagine that!)

Azzy · 05-20-2010, 08:45 PM

It's sensor problem, I had some problem previously on my K10D

See the bottom of the image (much more visible on full size)

I sent my K10D for repair and Pentax replaced the sensor to fix the problem

kevinschoenmakers · 05-21-2010, 01:36 AM

How much did it cost?

05-20-2010, 11:17 AM	#1
kevinschoenmakers Veteran Member Join Date: Mar 2009 Location: Shanghai Photos: Gallery Posts: 1,509	Is this a banding issue? See this picture (clickable for fullsize): About two-thirds down the way there is a blue line accross the frame. Is this a banding issue? I've never really read up on this, only heard the term come by once. What is it, what can be done? Could it be this is just because the sensor was hot (I had been shooting continuously for a long time when I took this photo)? Help much appreciated!

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05-20-2010, 11:24 AM	#2
testuser Veteran Member Join Date: Aug 2009 Photos: Gallery \| Albums Posts: 1,100	Sure looks like it to me! I'm assuming it's taken at high ISO too, right? What camera?

05-20-2010, 11:39 AM	#3
kevinschoenmakers Veteran Member Join Date: Mar 2009 Location: Shanghai Photos: Gallery Posts: 1,509 Original Poster	Yes, ISO 1600 on a K10D. I just tried another ISO1600 shot, and there was no such line, so I guess, luckily, it only shows up after heating up...

05-20-2010, 02:12 PM	#4
Marc Sabatella Veteran Member Join Date: Sep 2006 Location: Denver, CO Photos: Gallery Posts: 10,685	Well, it's an issue, but it's not what people usually call "banding". That would be a much broader, fuzzier band - and usually vertical - where the noise inherent at high ISO forms a visible pattern.

05-20-2010, 03:05 PM	#5
wlachan Veteran Member Join Date: Sep 2006 Location: Canada Photos: Albums Posts: 2,625	Vertical banding for sure, but not quite severe considered it's iso1600. Every camera body is different given the same model. First thing to check when buying any new camera. Also, there is a horizontal line which is more disturbing. They will be quite visible if you check the blue channel in photoshop.

05-20-2010, 03:24 PM	#6
Marc Sabatella Veteran Member Join Date: Sep 2006 Location: Denver, CO Photos: Gallery Posts: 10,685	The horizontal blue line is what I was referring to when I said this was not "banding" in the usual sense. If there is a slight amount of vertical pattern to the noise as well, it's pretty subtle in this example - I've seen cases where it was compeltely obvious even at screen size.

05-20-2010, 03:48 PM	#7
kevinschoenmakers Veteran Member Join Date: Mar 2009 Location: Shanghai Photos: Gallery Posts: 1,509 Original Poster	I guess with a little imagination you could say this photo has some vertical patterns in the noise, but it's not obvious so it's not important. The horizontal line is the what I meant indeed. I hope it doesn't show up too often because then I might feel inclined to spend money on a new body (oh no, imagine that!)

05-20-2010, 08:45 PM	#8
Azzy Senior Member Join Date: Jan 2010 Photos: Albums Posts: 201	It's sensor problem, I had some problem previously on my K10D See the bottom of the image (much more visible on full size) I sent my K10D for repair and Pentax replaced the sensor to fix the problem

05-21-2010, 01:36 AM	#9
kevinschoenmakers Veteran Member Join Date: Mar 2009 Location: Shanghai Photos: Gallery Posts: 1,509 Original Poster	How much did it cost?