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
 >> Stay informed about: how to deal with dead pixels 

"Dave Cohen" <user DeleteThis @example.net> wrote in message
news:VM3uj.5075$kD3.4070@trnddc08...
> 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
 >> Stay informed about: how to deal with dead pixels 

On Sun, 17 Feb 2008 13:47:09 -0500, "H.S." <hs.samix DeleteThis @gmail.com> wrote in
<d60d0$47b8812d$4c0a97f8$20793@TEKSAVVY.COM-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)
 >> Stay informed about: how to deal with dead pixels 

On Feb 17, 7:21 pm, "Roy G" <roy.gibs... DeleteThis @virgin.net> wrote:
> "Dave Cohen" <u... DeleteThis @example.net> wrote in message
>
> news:VM3uj.5075$kD3.4070@trnddc08...
>
> > 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.
 >> Stay informed about: 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
 >> Stay informed about: how to deal with dead pixels 

On Mon, 18 Feb 2008 06:40:10 -0800 (PST), Don Stauffer in Minnesota
<stauffer.RemoveThis@usfamily.net> wrote in
<28dd94de-d781-47fa-98ee-d0e047139e49.RemoveThis@64g2000hsw.googlegroups.com>:

>On Feb 17, 7:21 pm, "Roy G" <roy.gibs....RemoveThis@virgin.net> wrote:
>> "Dave Cohen" <u....RemoveThis@example.net> wrote in message
>>
>> news:VM3uj.5075$kD3.4070@trnddc08...
>>
>> > 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)
 >> Stay informed about: how to deal with dead pixels 

In article <q54ir35jgnql32v6kgh895aeu7q14mcu2n.RemoveThis@4ax.com>, John Navas <spamfilter1.RemoveThis@navasgroup.com> wrote:
>On Sun, 17 Feb 2008 13:47:09 -0500, "H.S." <hs.samix.RemoveThis@gmail.com> wrote in
><d60d0$47b8812d$4c0a97f8$20793@TEKSAVVY.COM-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
 >> Stay informed about: how to deal with dead pixels 

On Tue, 19 Feb 2008 15:51:58 GMT, zekfrivo RemoveThis @zekfrivolous.com (GregS)
wrote in <fpetut$do8$1@usenet01.srv.cis.pitt.edu>:

>In article <q54ir35jgnql32v6kgh895aeu7q14mcu2n RemoveThis @4ax.com>, John Navas <spamfilter1 RemoveThis @navasgroup.com> wrote:
>>On Sun, 17 Feb 2008 13:47:09 -0500, "H.S." <hs.samix RemoveThis @gmail.com> wrote in
>><d60d0$47b8812d$4c0a97f8$20793@TEKSAVVY.COM-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.

Why would you want to buy a camera that can't do that at any time,
manually or automatically?

--
Best regards,
John Navas
Panasonic DMC-FZ8 (and several others)
 >> Stay informed about: how to deal with dead pixels