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"sparklies" in digital image



 
 
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  #1  
Old October 13th 04, 01:59 PM
Ted Kerin
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Default "sparklies" in digital image

Can anyone please help me to identify what is going on with my Casio Exilim
s20U images?

Here's a sample:

http://home.earthlink.net/~tfkerin/sample.jpg

I didn't notice this out of the box (just a few weeks ago), but in dark
areas of the images, I am getting white speckles. They're only noticeable in
dark areas or dark photos, and they are not always in the same place (so I
assume they're not dust). Sometimes they appear to be in areas where I can
spot no pattern, whereas other times the sparklies tend to follow the
outlines or contours of an object.

It happens with different SD cards.

Does anybody recognize this type of defect? Or have an idea for the fix?
It's nothing beyond what Photoshop's despeckle filter can fix, but I hate to
have to deal with it -- this doesn;t look normal to me, but maybe somebody
here has seen something like this.

Any clues would be appreciated. Thanks!


  #2  
Old October 13th 04, 02:26 PM
Larry
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Default

In article et,
says...
Can anyone please help me to identify what is going on with my Casio Exilim
s20U images?

Here's a sample:

http://home.earthlink.net/~tfkerin/sample.jpg

I didn't notice this out of the box (just a few weeks ago), but in dark
areas of the images, I am getting white speckles. They're only noticeable in
dark areas or dark photos, and they are not always in the same place (so I
assume they're not dust). Sometimes they appear to be in areas where I can
spot no pattern, whereas other times the sparklies tend to follow the
outlines or contours of an object.

It happens with different SD cards.

Does anybody recognize this type of defect? Or have an idea for the fix?
It's nothing beyond what Photoshop's despeckle filter can fix, but I hate to
have to deal with it -- this doesn;t look normal to me, but maybe somebody
here has seen something like this.

Any clues would be appreciated. Thanks!


Since you didn't provide exposure info Im going to go out on a limb and
GUESS.. It was a long exposure, so I would say its caused by a few hot
pixels, though Ive not known that problem to be random, Im sure different
pixels will act differently on different exposure length.

One thing Im fairly certain sure of, its NOT the memory card.


--
Larry Lynch
Mystic, Ct.
  #3  
Old October 13th 04, 02:26 PM
Larry
external usenet poster
 
Posts: n/a
Default

In article et,
says...
Can anyone please help me to identify what is going on with my Casio Exilim
s20U images?

Here's a sample:

http://home.earthlink.net/~tfkerin/sample.jpg

I didn't notice this out of the box (just a few weeks ago), but in dark
areas of the images, I am getting white speckles. They're only noticeable in
dark areas or dark photos, and they are not always in the same place (so I
assume they're not dust). Sometimes they appear to be in areas where I can
spot no pattern, whereas other times the sparklies tend to follow the
outlines or contours of an object.

It happens with different SD cards.

Does anybody recognize this type of defect? Or have an idea for the fix?
It's nothing beyond what Photoshop's despeckle filter can fix, but I hate to
have to deal with it -- this doesn;t look normal to me, but maybe somebody
here has seen something like this.

Any clues would be appreciated. Thanks!


Since you didn't provide exposure info Im going to go out on a limb and
GUESS.. It was a long exposure, so I would say its caused by a few hot
pixels, though Ive not known that problem to be random, Im sure different
pixels will act differently on different exposure length.

One thing Im fairly certain sure of, its NOT the memory card.


--
Larry Lynch
Mystic, Ct.
  #4  
Old October 13th 04, 03:26 PM
Ted Kerin
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Posts: n/a
Default

Thanks, Larry. The camera was set in all the automatic modes -- what they
call "snapshot", with auto flash, auto ISO, auto white balance, no EV shift,
quality "fine". It's hard to say more, since everything was in auto mode,
but you're probably right that the problem images may tend to be long
exposures. But, I have also seen this effect in flash pictures at short
range (which I'm guessing shouldn't take a long exposure) -- the white
speckles appear in the darker areas surrounding or behind the subject in the
forground,....like in this second sample:

http://home.earthlink.net/~tfkerin/sample-2.jpg

I hadn't heard of "hot pixels" causing this effect -- very interesting,
although it's odd how the speckles follow a pattern around objects.

After I posted, I called Casio tech support, which suggested that I send the
camera in for repair. But the guy didn't really have a theory about the
cause, so I'm still interested in what you or anyone has to say. Thanks
again.


  #5  
Old October 13th 04, 03:26 PM
Ted Kerin
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Posts: n/a
Default

Thanks, Larry. The camera was set in all the automatic modes -- what they
call "snapshot", with auto flash, auto ISO, auto white balance, no EV shift,
quality "fine". It's hard to say more, since everything was in auto mode,
but you're probably right that the problem images may tend to be long
exposures. But, I have also seen this effect in flash pictures at short
range (which I'm guessing shouldn't take a long exposure) -- the white
speckles appear in the darker areas surrounding or behind the subject in the
forground,....like in this second sample:

http://home.earthlink.net/~tfkerin/sample-2.jpg

I hadn't heard of "hot pixels" causing this effect -- very interesting,
although it's odd how the speckles follow a pattern around objects.

After I posted, I called Casio tech support, which suggested that I send the
camera in for repair. But the guy didn't really have a theory about the
cause, so I'm still interested in what you or anyone has to say. Thanks
again.


  #7  
Old October 13th 04, 07:36 PM
Jim
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Posts: n/a
Default


"Ted Kerin" wrote in message
nk.net...
Can anyone please help me to identify what is going on with my Casio

Exilim
s20U images?

Here's a sample:

http://home.earthlink.net/~tfkerin/sample.jpg

It looks like noise. It will probably go away if you increase the exposure.
Jim


  #8  
Old October 13th 04, 07:40 PM
Marvin Margoshes
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Posts: n/a
Default


"Ted Kerin" wrote in message
ink.net...
Thanks, Larry. The camera was set in all the automatic modes -- what they
call "snapshot", with auto flash, auto ISO, auto white balance, no EV
shift,
quality "fine". It's hard to say more, since everything was in auto mode,
but you're probably right that the problem images may tend to be long
exposures. But, I have also seen this effect in flash pictures at short
range (which I'm guessing shouldn't take a long exposure) -- the white
speckles appear in the darker areas surrounding or behind the subject in
the
forground,....like in this second sample:

http://home.earthlink.net/~tfkerin/sample-2.jpg

I hadn't heard of "hot pixels" causing this effect -- very interesting,
although it's odd how the speckles follow a pattern around objects.

After I posted, I called Casio tech support, which suggested that I send
the
camera in for repair. But the guy didn't really have a theory about the
cause, so I'm still interested in what you or anyone has to say. Thanks
again.


Dust in the air often causes white spots in flash photos. All I see in the
firts picture is some blue lines to the left; they are unlike anything I've
seen. All I see in the seocnd is a small spot above and slightly to the
left of the boy's head. It could be something on the wall back there. Am I
looking in the wrong places?


  #9  
Old October 13th 04, 07:40 PM
Marvin Margoshes
external usenet poster
 
Posts: n/a
Default


"Ted Kerin" wrote in message
ink.net...
Thanks, Larry. The camera was set in all the automatic modes -- what they
call "snapshot", with auto flash, auto ISO, auto white balance, no EV
shift,
quality "fine". It's hard to say more, since everything was in auto mode,
but you're probably right that the problem images may tend to be long
exposures. But, I have also seen this effect in flash pictures at short
range (which I'm guessing shouldn't take a long exposure) -- the white
speckles appear in the darker areas surrounding or behind the subject in
the
forground,....like in this second sample:

http://home.earthlink.net/~tfkerin/sample-2.jpg

I hadn't heard of "hot pixels" causing this effect -- very interesting,
although it's odd how the speckles follow a pattern around objects.

After I posted, I called Casio tech support, which suggested that I send
the
camera in for repair. But the guy didn't really have a theory about the
cause, so I'm still interested in what you or anyone has to say. Thanks
again.


Dust in the air often causes white spots in flash photos. All I see in the
firts picture is some blue lines to the left; they are unlike anything I've
seen. All I see in the seocnd is a small spot above and slightly to the
left of the boy's head. It could be something on the wall back there. Am I
looking in the wrong places?


  #10  
Old October 13th 04, 08:22 PM
Tetractys
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Posts: n/a
Default

Ted Kerin wrote:

Can anyone please help me to identify
what is going on with my Casio Exilim
s20U images?


The only things I spot with either image
are clearly highlights or reflections from
the subjects.

Perhaps you could post shots with arrows
identifying the spots that interest you?


 




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