Help me ... white dots in photos ????

[kaushik]

Hello guys, last night i was taking some random photos and i found out some white colored dots in my photos . These photos were taken in ISO 1600. I have even cleaned my lens but even then it keeps on coming .:mad:.. PLz help guys ??? :confused:
http://i55.tinypic.com/ndk8lu.jpg
http://i53.tinypic.com/v6k6z7.jpg

[anvancy-(macro analyst)]

Did u use long exposure for the shot??

To me they look like two things.

Either dead Pixels or Dust.Dust which is sitting on the sensor.If this is a compact then dead pixels.

Query Approved.

Anvancy

[surya@64]

It looks like dead pixels...Dust appears as black spots.

Shoot a white wall to check for dust...( p&s no issue of dust). if dark spots appear it need a professional cleaning.

Good luck.

[kaushik]

thnx guys for the inputs ... these dots generally occur when i capture photos in night when most of the part of my photo is covered by black ..

[Devaiah PA]

thnx guys for the inputs ... these dots generally occur when i capture photos in night when most of the part of my photo is covered by black ..

Those are hot pixels....common in digital photography

[kaushik]

Now what is this hot pixels:confused: Is it something to worry about . N how can i fix it ???? sorry for being so noobish :o:o

[Cyclops]

A hot pixel is created by an element with a higher rate of charge leakage than its neighbors which, on a long exposure, may cross the threshold of an exposed value. Many digicams don't permit exposures longer than a quarter second, which effectively eliminates the chance that any element with a dark current, so to speak, will consistently report an exposure value.

"A hot pixel can range from bright white to something just barely distinguishable from black."

In addition to dark current, temperature is also a factor in creating hot pixels. The higher the temperature, the higher the charge leakage. A 10 degree change in temperature can noticeably change what the CCD reports.

Astronomers who use CCDs to record the night life of celestial bodies have long dealt with this phenomenon. If you think you have problems, see http://ecf.hq.eso.org/newsletter/stecf-nl-22/freudling/freudling.html for example. They typically take very long exposures, and are concerned that dark current and hot pixels, producing measurable noise in repeatable patterns, are not confused with actual data. So they've developed techniques for masking them out of the picture or the data.

To see your camera's hot pixels, set the camera to do no image manipulation or enhancement. Use ISO 100 (if you have variable ISO settings), turn off any sharpening, contrast, or brightness settings. Assuming your indoor temperature is less than 76° F, go into a dark room, turn off the LCD monitor, cover the lens, and make exposures of 1/4, 1/2, 1, 2, and 4 seconds.

Then take a look at these "dark frame" images. Higher magnification (say, 400 percent) makes it easier to see noise. You should expect to see a gradual increase in noise relative to the exposure length. If you find one bright pixel at every exposure setting, repeat the test with shorter exposures. You may find it does not disappear at any exposure. If that's the case, save your results to document the problem for the manufacturer and try the test again.

[anvancy-(macro analyst)]

Now what is this hot pixels:confused: Is it something to worry about . N how can i fix it ???? sorry for being so noobish :o:o

Cloning in PS is the best solution according to me.Even we encounter hot pixels in long exposures.My Fuji had hot pixels.But it was easy to clone it out.

Anvancy

[KrishnenduKes]

If that's the case, save your results to document the problem for the manufacturer and try the test again. [/I]

How does seeing the manufacturer help the case?

[synn]

Those are hot pixels....common in digital photography


This was my initial though too. Sure looks like it.

I always fix them in post. Just takes a few moments.

[Cyclops]

How does seeing the manufacturer help the case?

I did talk to a few photographer friends abroad and they say that the concerned manufacturer replaces the faulty sensors in harsh cases and in other cases, remap the sensor to reduce/mask the hot pixels. I'm not sure about something in India regarding this issue.

Best & easiest option (already mentioned by pros) - edit hot pixels or dust in Adobe PS or other similar editing program.