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03-15-2009, 07:50 AM   #1
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miriya's Avatar

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Strange K10D noise pattern

Hi, look at this..

I've noticed a strange pattern of blue noise .. like this.

these photos taken at ISO800 by K10D.

You can find long blue noise at top of screen.

I brought to A/S center, but I can't receive exact answer.


http://miriya.textcube.com/90/attach/blue.part1.rar
http://miriya.textcube.com/90/attach/blue.part2.rar
http://miriya.textcube.com/90/attach/blue.part3.rar

you can find PEF flie at link above.

with SD card and look by K10D's LCD, you can see much clearly.


https://www.pentaxforums.com/forums/pentax-dslr-discussion/47584-strange-k20d...-patterns.html

is it same kind of problem above?












Last edited by miriya; 03-15-2009 at 07:57 AM.
03-15-2009, 08:17 AM   #2
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Sorry, but I don't see anything. Nothing on standart monitor settings, nothing with 100% brightness.
03-15-2009, 08:18 AM   #3
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Basically i dont see it, thuss cannot help.
What do you mean by strange noise. You could give us some description so we would know what to look for. I could even say that i cant see any noise at all. Seems more like image details.
Can you show us a blank shot with the same noise?
03-15-2009, 09:24 AM   #4
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Original Poster
QuoteOriginally posted by Zebooka Quote
Sorry, but I don't see anything. Nothing on standart monitor settings, nothing with 100% brightness.
http://fs.textcube.com/blog/0/474/attach/XC2iAvEZEL.jpg

look at this image, right only blue channel - gray image.

not monitor setting.

can't you see bright boundary?

03-15-2009, 09:26 AM   #5
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Original Poster
QuoteOriginally posted by ytterbium Quote
Basically i dont see it, thuss cannot help.
What do you mean by strange noise. You could give us some description so we would know what to look for. I could even say that i cant see any noise at all. Seems more like image details.
Can you show us a blank shot with the same noise?
I can't, I sold my K10D few months..

http://fs.textcube.com/blog/0/474/attach/XC2iAvEZEL.jpg

look at blue channel boundary.(center of image.)

I can't speak English very well to good explain.
03-15-2009, 09:29 AM   #6
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Original Poster
more explain..

extra ordinary blue noise.

I marked red circle.



03-15-2009, 10:09 AM   #7
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Ahh now i understand, something like a blue cast. I'd like to call it an image artifact.
Well its hard to tell without any additional information and testing.
Judging from its gradial characteristics, makes me feel like there is something heating up at that edge.
This leaves question why blue? It should be most sensitive/amplified, since semiconductors are not that good at seeing blue, even more if this is shot under incandescent light.
This can be tested by taking some RAW file wich shows this artifact and "amplifying" (boost contrast+brightness) other channel (Green for example), to see if the same pattern appears.

I just hope the one you sold your camera to was aware of this thing. Nothing i'd worry about, but this kind of things usually come some week or so before CCD explodes with flames and smoke .

Btw.. my english is no better either. I just try to express my toughts with full sentences and not worry too much. In the mean time "learning" from the spelling and grammar checker.
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