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how to deal with dead pixels



 
 
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  #1  
Old February 17th 08, 06:47 PM posted to rec.photo.digital
H.S.[_2_]
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Posts: 18
Default how to deal with dead pixels


Hello,

I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?

thanks,
Sam.
  #2  
Old February 17th 08, 11:52 PM posted to rec.photo.digital
Dave Cohen
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Posts: 841
Default how to deal with dead pixels

H.S. wrote:

Hello,

I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?

thanks,
Sam.


If you can live with the bother, fixing in any decent photo editor is
trivial. I assume that is all that is wrong and one hopes the problem
doesn't grow with time. Silly question but you do mean main sensor and
not the viewing lcd?
Dave Cohen
  #3  
Old February 18th 08, 01:21 AM posted to rec.photo.digital
Roy G[_2_]
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Posts: 208
Default how to deal with dead pixels


"Dave Cohen" wrote in message
news:[email protected]
H.S. wrote:

Hello,

I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?

thanks,
Sam.



It is hardly a major problem, just make do with the remaining 3871487
pixels.

Roy G


  #4  
Old February 18th 08, 01:44 AM posted to rec.photo.digital
H.S.[_2_]
external usenet poster
 
Posts: 18
Default how to deal with dead pixels

Dave Cohen wrote:
H.S. wrote:

Hello,

I just noticed that my Canon A520 seems to have developed a dead
pixel. It appears it started to 'die' around a month ago. Now in every
dark picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?

thanks,
Sam.


If you can live with the bother, fixing in any decent photo editor is
trivial. I assume that is all that is wrong and one hopes the problem
doesn't grow with time. Silly question but you do mean main sensor and
not the viewing lcd?
Dave Cohen



I am going to give Gimp a try. And, yes, the main sensor.

thanks,
-HS
  #5  
Old February 18th 08, 05:09 AM posted to rec.photo.digital
John Navas[_2_]
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Posts: 3,956
Default how to deal with dead pixels

On Sun, 17 Feb 2008 13:47:09 -0500, "H.S." wrote in
-Free:

I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?


Some cameras have the ability to map out dead pixels (interpolating them
from nearby pixels). Check your manual.

--
Best regards,
John Navas
Panasonic DMC-FZ8 (and several others)
  #6  
Old February 18th 08, 02:40 PM posted to rec.photo.digital
Don Stauffer in Minnesota
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Posts: 464
Default how to deal with dead pixels

On Feb 17, 7:21 pm, "Roy G" wrote:
"Dave Cohen" wrote in message

news:[email protected]

H.S. wrote:


Hello,


I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.


What are the various methods to deal with such dead pixels other than
buying a new camera?


thanks,
Sam.


It is hardly a major problem, just make do with the remaining 3871487
pixels.

Roy G


The easiest method is the clone tool. Just zoom it way up, use the
clone tool to copy an adjacent pixel. Even better, set clone opacity
to about 25% and clone from four close neighbors surrounding the dead
one.

  #7  
Old February 18th 08, 04:02 PM posted to rec.photo.digital
John Navas[_2_]
external usenet poster
 
Posts: 3,956
Default how to deal with dead pixels

On Mon, 18 Feb 2008 06:40:10 -0800 (PST), Don Stauffer in Minnesota
wrote in
:

On Feb 17, 7:21 pm, "Roy G" wrote:
"Dave Cohen" wrote in message

news:[email protected]

H.S. wrote:


I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.


What are the various methods to deal with such dead pixels other than
buying a new camera?


It is hardly a major problem, just make do with the remaining 3871487
pixels.


The easiest method is the clone tool. Just zoom it way up, use the
clone tool to copy an adjacent pixel. Even better, set clone opacity
to about 25% and clone from four close neighbors surrounding the dead
one.


Automate and simplify with the Photoshop Spot Healing Brush Tool with a
Size of (say) 4 pixels.

--
Best regards,
John Navas
Panasonic DMC-FZ8 (and several others)
  #8  
Old February 18th 08, 06:34 PM posted to rec.photo.digital
Greg Campbell
external usenet poster
 
Posts: 47
Default how to deal with dead pixels

H.S. wrote:

Hello,

I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?

thanks,
Sam.



Dead/stuck/hot pixels are one of the things digital evangelists never
mention. If your camera has 'grown' one, it will no doubt grow more as
time passes.

A simple image editor will do fine for a few. When you get dozens of
the things, you can use layer subtraction or one of several programs to
automatically subtract out the pretty spots. Layer subtraction tends to
leave halos and artifacts, particularly when working on JPEG compressed
images. The more sophisticated programs are smarter and leave fewer
'scars' on the image.

-Moo



  #9  
Old February 19th 08, 03:51 PM posted to rec.photo.digital
GregS[_3_]
external usenet poster
 
Posts: 158
Default how to deal with dead pixels

In article , John Navas wrote:
On Sun, 17 Feb 2008 13:47:09 -0500, "H.S." wrote in
-Free:

I just noticed that my Canon A520 seems to have developed a dead pixel.
It appears it started to 'die' around a month ago. Now in every dark
picture, that one pixel comes out to be bright red.

What are the various methods to deal with such dead pixels other than
buying a new camera?


Some cameras have the ability to map out dead pixels (interpolating them
from nearby pixels). Check your manual.


I would imagine they all do that initially after production.

greg
 




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