Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-02-2011, 08:41 AM   #1
New Member




Join Date: Dec 2010
Posts: 5
Dead pixel on the Sensor?

Here is a pic I took with lens cap on, 100% crop. I found two bright dots...and all my other pics has the dots at the same position. so does this mean my K20D has a bad sensor? is there anyway to fix this? This is my first DSLR and I need some help. Thank you.

Attached Images
 
01-02-2011, 01:43 PM   #2
Veteran Member




Join Date: Nov 2010
Location: Nebraska
Photos: Gallery
Posts: 327
I can't give you an answer on what the white dots are but if they are dead pixels, does your camera have a pixel mapping function? My K-x does. I read somewhere it's good to run that occasionally.
01-02-2011, 02:43 PM   #3
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
Page 235 of the K20d manual. Pixel mapping. Try it, you'll like it.

01-02-2011, 03:52 PM   #4
New Member




Join Date: Dec 2010
Posts: 5
Original Poster
QuoteOriginally posted by JeffJS Quote
Page 235 of the K20d manual. Pixel mapping. Try it, you'll like it.

wow, Thank you! I tried pixel mapping, and the dots were gone~! Not sure how this works out, but it is amazing.

01-02-2011, 04:18 PM   #5
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
I think the camera takes a dark frame shot and uses that to map the pixels then just clone them out or turn them off. Not sure, Don't care, but I'm glad it does work. My K7 out of the box, brand new, had one dead center. No others ever appeared after the mapping.

Enjoy your K20d. It's a fine camera, I had 2 of them (had to sell one to pay bills and then bought another later).

01-05-2011, 12:20 PM   #6
New Member




Join Date: Dec 2010
Location: Targu mures
Photos: Gallery
Posts: 22
my k-7 also had about 3 dots straight out of the box. as soon as i noticed them i used pixel mapping. Thank you Pentax for making such smart and easy to use cameras
01-11-2011, 09:25 AM   #7
Inactive Account




Join Date: Jan 2011
Location: Malaysia
Posts: 1
Does the K100D has the 'pixel mapping' feature? Please advise, thanks.
01-11-2011, 10:07 AM   #8
Site Supporter
Sluggo's Avatar

Join Date: Sep 2006
Location: Ames, Iowa
Photos: Gallery | Albums
Posts: 601
QuoteOriginally posted by clickNsnap Quote
Does the K100D has the 'pixel mapping' feature? Please advise, thanks.
No, as far as I know it lacks that feature. But depending on how your process your pictures, you might be able to do it in your computer. My K100D has a number of bad pixels that don't cause problems anymore, because I made a little .badpixels plain text file that lists their coordinates, and UFRaw consults it when processing my RAW picture files. Different software packages have this implemented in different ways.

01-11-2011, 10:14 AM   #9
Inactive Account




Join Date: Aug 2008
Location: Michigan, USA
Photos: Gallery | Albums
Posts: 7,484
See the section on cloning out dust for help in how to kill the dead pixels in your photos.

https://www.pentaxforums.com/forums/pentax-dslr-camera-articles/121739-those-...ur-photos.html

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
New Pentax K7 - Dead pixel in video dutch Video and Pentax HDSLRs 3 03-16-2010 03:47 PM
What counts as a dead pixel? KansasHorizons.com Pentax DSLR Discussion 7 03-11-2010 01:27 PM
Dead Pixel on *istD Zarkon Pentax DSLR Discussion 2 05-24-2009 08:50 PM
K10D back from dead/hot pixel repair pentaxbling Pentax DSLR Discussion 6 10-08-2007 05:31 PM
dead pixel on long exposure question pentaxbling Pentax DSLR Discussion 2 08-27-2007 02:03 PM



All times are GMT -7. The time now is 08:39 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top