Bright Red Speck in my Photos... - ClubTread Community

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post #1 of (permalink) Old 09-28-2007, 09:25 PM Thread Starter
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Default Bright Red Speck in my Photos...

Lately, in every picture that has darker portions on the left bottom half there is always a very bright red speck. I have dusted the lens and the circular polarizor but it hasn't helped. Any suggestions?
Thanks,
Lynn
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post #2 of (permalink) Old 09-28-2007, 09:31 PM
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Can you post an example?
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post #3 of (permalink) Old 09-28-2007, 09:41 PM
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If it was a film camera I would say you have a crack in the body letting light in?
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post #4 of (permalink) Old 09-28-2007, 09:42 PM
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Assuming a digital camera, most likely it is a 'stuck' pixel.
No cure except cloning it out. Some cameras allow mapping out dead/stuck pixels in their firmware, check the manual.
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post #5 of (permalink) Old 09-28-2007, 09:42 PM Thread Starter
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When I post an example it doesn't show because it goes from 6mp to 1 or 2...sorry that I can't let you see what I see.

hmm, interesting to know that the bright red speck doesn't show up when the picture is reduced...this one has the same speck in 6 and 4mp but not when downloaded on CT
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post #6 of (permalink) Old 09-28-2007, 10:06 PM
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Digital images store colours as red green and blue values between 0 and 255. Zero is black, 255 is the maximum intensity of that colour. It sounds like a particular pixel is stuck at 255 in the red channel. It's easy to find these by taking a photo with the lens cap on. It's very common, and most cameras have at least a few. It disappears when the photo size is reduced because that particular pixel is then mixed with surrounding pixels. They typically dissapear when you print them too.
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post #7 of (permalink) Old 09-28-2007, 10:11 PM
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Crop the photo down so that just the area of the pixel is shown not the whole photo, then post the crop, if you want us to see it.
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post #8 of (permalink) Old 09-28-2007, 11:44 PM
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The same thing happens with our Kodak CX4300, but only in "ZOOM" mode. The pixel isn't brilliant red, but it is unmistakably red!

The only way I found to get rid of it was to upgrade to the Canon A630!
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post #9 of (permalink) Old 09-29-2007, 12:54 AM
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You could test for dead or hot pixels...
Using this program:
http://www.starzen.com/imaging/deadpixeltest.htm

Also you should test the speck under different iso settings and see if it is there in all, and gets worse with higher iso#



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post #10 of (permalink) Old 09-29-2007, 01:00 AM
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Interesting... I just took a picture as the test above suggests with the lens cover on, and i seen a red pixel!

I did the test with the program and it says I am fine however...
I used a jpg file rather than a tiff file.
Good luck!



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post #11 of (permalink) Old 09-29-2007, 08:57 AM Thread Starter
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for dru, le bright red speck in le dark area of first pic...

Thanks for sending the test Chris, it turns out I have 38829 dead pixels 2198148 hot pixels in the first picture. Every picture I've tested shows I have a dead pixel problem in the left side. The camera is only 8 months old. I'm wondering if Lumix stands by their pixels?
Thank you EugeneK, magnetite, TheShadow for your expertise.
Take care,
Lynn
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post #12 of (permalink) Old 09-29-2007, 11:37 AM
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When unzipping the files there is 1 wordpad document with instructions.

Did you do the test with the lens cover in place? or did you do the test with pictures you took?

With the lens cover in place is the proper method, but maybe you did do that... That sounds like the camera has issues if you got those results from a picture of nothingness with the lens cover on.





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post #13 of (permalink) Old 09-29-2007, 12:17 PM
 
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Definitely a hot pixel. Most cameras have them but onboard software maps them out so you don't see them. My K100d has one on the left side but I only see it if I open a RAW file in a program that doesn't map out hot pixels.
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post #14 of (permalink) Old 09-29-2007, 01:46 PM
 
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...mind u i had that happening on my standard camera for a while then i went a way after a while
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post #15 of (permalink) Old 09-29-2007, 04:03 PM Thread Starter
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Quote:
quote:Originally posted by AcesHigh

When unzipping the files there is 1 wordpad document with instructions.

Did you do the test with the lens cover in place? or did you do the test with pictures you took?
The unexposed pics show zero dead pixels, it's only on the exposed pictures that the specks and dead pixels show up. London Drugs said they would diagnose for me and fix the camera but only if it's never been dropped. Turns out the camera was dropped down a rock face once[B)]. I printed the pictures, and as magnetite says, the specks didn't show up so I'll be able to live with le red specks.
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