DPChallenge: A Digital Photography Contest You are not logged in. (log in or register
 

DPChallenge Forums >> Hardware and Software >> Dead pixels?
Pages:  
Showing posts 1 - 7 of 7, (reverse)
AuthorThread
07/05/2008 10:58:56 AM · #1
Forgive the shorthand if I use it. In the north ga mtns on a frigging treo.

Been noticing some funky pixels on my longer shutter speed shots. It's not simple white dots but actual reds greens and blues. Are they dead pixels or something else? Even does it at larger/middle apertures.
07/05/2008 11:03:37 AM · #2
Noise? Are you shooting at high iso's?

Maxxum 7D, is that even digital? I used to sell Maxxums 25 years ago. Are they still using the name brand for digital?
07/05/2008 11:08:05 AM · #3
ISO 100.

Yes, Maxxum 7D is digital.
07/05/2008 11:11:03 AM · #4
Also, they're in the same spot on every image so it's definitely a pixel issue. Just wondering if they're dead or if it's something else.
07/05/2008 11:59:32 AM · #5
Yes, it sounds like bad pixels. I can't remember which editing program it is that I have, with a feature that "learns" bad pixels, and corrects them when you edit. You can also retouch them out by hand, but it is a pain if there are a lot of them. Longer exposure times increase the problem, as you have noticed.
07/05/2008 08:04:34 PM · #6
Thanks much.
07/05/2008 08:55:17 PM · #7
Not to be a know it all but I'm bored and this might be informative to someone...

There are two types of broken pixels, stuck pixels or hot pixels, and dead pixels.

A pixel consists of three to four sub pixels, of red, green, and blue. If a pixel is stuck, it means one or more sub pixels are stuck on. These tend to show up during night time shots. If the resulting pixel appears red, then the red pixel is stuck.

The opposite is a dead pixel, where one or more sub pixels are stuck off. These tend to show up with bright photos but are much harder to see against the bright colors in the image. Being the opposite, their color is also opposite of which sub pixels are stuck. So a red pixel in a white image means that blue and green are dead, for a yellow pixel it means blue is dead, since red and green make yellow.

Hope this is helpful to someone.
Pages:  
Current Server Time: 12/28/2025 12:51:54 AM

Please log in or register to post to the forums.


Home - Challenges - Community - League - Photos - Cameras - Lenses - Learn - Help - Terms of Use - Privacy - Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 12/28/2025 12:51:54 AM EST.