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02-07-2011, 03:41 PM   #1
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Blue spots on images

Hi there. I have five blue spots showing when my images are magnified to 100%.
One spot appeared a few months ago, now there are five. Camera raw processes them out, but how important are they and can anything be done about them. The camera is a Samsung GX10.

02-07-2011, 03:59 PM   #2
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It's best to post some example photos so we can see what we are dealing with, although it sounds like dust on the sensor.
02-07-2011, 04:08 PM   #3
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It is definately not dust on the sensor. The spots are bright blue and square, the size of a pixel. They are not noticable at normal size, but when blown up to 100% show up like small lights. Then they disappear as camera raw processes them out.
What concerns me, is the fact that they are getting more numerous.
02-07-2011, 04:28 PM   #4
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Sounds more like dead pixels than dust to me. It shouldn't matter with a RAW file but do you have any in camera noise reduction turned on?



02-07-2011, 04:42 PM   #5
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Thanks Jeffjs. Yes, I do have in camera noise turned on. Is it better to turn it off? I always shoot in Raw. Have you any idea if these dead pixels, once they have started, tend to get worse. I`ve just been having a look at the images using Picasa, which does not process the spots out, and in all, there are three blue and six green.
02-07-2011, 05:10 PM   #6
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Definitely pixels. I can't say for sure if it'll get worse or not. Later cameras have a pixel mapping function that takes care of it but I don't think the GX10/K10d generation has that feature. You can try playing with the noise reduction settings to see if it changes anything. In my K10d, I always had the NR turned off but don't think it mattered because I always used the RAW files. I'm afraid that other than suggestions for how to process them out, I may not be of much further help.

02-07-2011, 05:19 PM   #7
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Thanks very much for taking the trouble to reply Jeffjs, much appreciated. I`ll go along with your dead pixel theory and keep my fingers crossed. I can always fall back to my trusty K100D Super.
02-07-2011, 05:27 PM   #8
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If you have software that will do batch processing, this may help you deal with them..

https://www.pentaxforums.com/forums/pentax-dslr-camera-articles/121739-those-...ml#post1259109



02-07-2011, 11:29 PM   #9
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Probably pixels but still can't say for sure until we can see examples.
02-08-2011, 02:43 AM   #10
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Thanks for your replies. Everything is fine after processing in camera raw, which hides them after loading the image at 100%. What concerns me is that I thought I had only one blue pixel, but after viewing them in Picasa, last night,which does not process them out, I find that I have 7 blue pixels and 9 green pixels. If it carries on like this , I may end up with 10 million green & blue pixels. Could be a good excuse to get a Kr.
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