Dead Pixel? For HF*** owners. at DVinfo.net

Dima Vorobiev · January 21st, 2009, 01:31 AM

Guys, got some strange stuff, captured some footage in absolutely dark area (so video is black) in cine mode, than I watched it on monitor and found some dead (?) pixels. Some bright dots all over the picture, they are appearing and disappearing. In automatic (and any other) mode there are no such issue, maybe because there are a lot of other noise, but in cine mode I’ve got this:

http://vorobfiles.narod.ru/snapshot20090121102523.png

It was hard to capture screen, but think you’ll see if you zoom parts with arrows.

Anyone here with HF cameras, can you make same video? Absolute darknes + cine mode, video about 5 sec, just to compare.

Thanks.

Bruce Foreman · January 22nd, 2009, 12:09 AM

Dima,

I downloaded your sample and looked at the areas your blue arrows point to and under maximum magnification saw nothing but black. I don't see anything to indicate you have a problem with your camera. If what you see appears and disappears you may simply be seeing transient artifacts caused by your monitor.

If what you're seeing is on your LCD fold out screen, again nothing to worry about.

Just relax and enjoy the camera.

Larry Horwitz · January 22nd, 2009, 12:43 AM

Dima,

My experience is the same as Bruce's.

I cropped the image you sent and enlarged it about 500%.

I cannot see any of the defects you are referring to.

I have attached the enlarged crop. Do you see the "stuck pixels" in this image also?

Your HF camera seems to work the same as my HF100 based on the prior post and frame grabs you posted in the forest. I think your camera is working correctly.

Larry

Brian Boyko · January 22nd, 2009, 02:21 AM

I can see the dead pixels in that 500% enlargement.

Robin Davies-Rollinson · January 22nd, 2009, 03:36 AM

So can I, but I doubt that you'd notice them on live video...

Larry Horwitz · January 22nd, 2009, 09:21 AM

I had to adjust my monitor gamma in order to see the pixels which were not black. At normal (unmagnified) 1920 by 1080 they are now visible but only visible if you really look for them carefully.

I have further enlarged the crop by another 3X, to a total of 15X, and shifted the gamma to emphasize the dots, so at very high enlargement they are very visible. I have attached this further enalrged, gamma shifted crop to show where they are.

Personally I would not consider this a flaw in the camera, particularly if these dots move with time rather than appear as stationary "stuck" pixels as you originally stated.

Larry

Dima Vorobiev · January 22nd, 2009, 10:37 AM

Well, this screen shot isn’t good example, here are 18sec video in absolute darkness, is there is any one with good FULL HD TV or monitor, I would appreciate if you test this video :)

RapidShare: Easy Filehosting

Bob Curnow · January 22nd, 2009, 12:22 PM

Are they dead pixels, or just don't register low light as well as the majority?

Dima Vorobiev · January 22nd, 2009, 01:32 PM

Em, sorry? What do you mean? The are some light dots, some of them "walk around the picture" and some of them stand in one place.

January 21st, 2009, 01:31 AM	#1
Dima Vorobiev New Boot Join Date: Dec 2008 Location: Moscow Posts: 5	Dead Pixel? For HF* owners.** Guys, got some strange stuff, captured some footage in absolutely dark area (so video is black) in cine mode, than I watched it on monitor and found some dead (?) pixels. Some bright dots all over the picture, they are appearing and disappearing. In automatic (and any other) mode there are no such issue, maybe because there are a lot of other noise, but in cine mode I’ve got this: http://vorobfiles.narod.ru/snapshot20090121102523.png It was hard to capture screen, but think you’ll see if you zoom parts with arrows. Anyone here with HF cameras, can you make same video? Absolute darknes + cine mode, video about 5 sec, just to compare. Thanks. Last edited by Pete Bauer; January 21st, 2009 at 06:52 AM. Reason: profanity

January 22nd, 2009, 12:43 AM	#3
Larry Horwitz Major Player Join Date: Mar 2007 Location: Eggertsville, NY Posts: 528	Dima, My experience is the same as Bruce's. I cropped the image you sent and enlarged it about 500%. I cannot see any of the defects you are referring to. I have attached the enlarged crop. Do you see the "stuck pixels" in this image also? Your HF camera seems to work the same as my HF100 based on the prior post and frame grabs you posted in the forest. I think your camera is working correctly. Larry Attached Thumbnails

January 22nd, 2009, 02:21 AM	#4
Brian Boyko Major Player Join Date: Dec 2006 Location: Austin, TX Posts: 773	I can see the dead pixels in that 500% enlargement. __________________ Equip: Panny GH1, Canon HG20, Juicedlink, AT897, Sennh. EW/GW100, Zoom H2, Vegas 8.1

January 22nd, 2009, 09:21 AM	#6
Larry Horwitz Major Player Join Date: Mar 2007 Location: Eggertsville, NY Posts: 528	I had to adjust my monitor gamma in order to see the pixels which were not black. At normal (unmagnified) 1920 by 1080 they are now visible but only visible if you really look for them carefully. I have further enlarged the crop by another 3X, to a total of 15X, and shifted the gamma to emphasize the dots, so at very high enlargement they are very visible. I have attached this further enalrged, gamma shifted crop to show where they are. Personally I would not consider this a flaw in the camera, particularly if these dots move with time rather than appear as stationary "stuck" pixels as you originally stated. Larry Attached Thumbnails

January 22nd, 2009, 12:09 AM	#2
Bruce Foreman Trustee Join Date: Nov 2006 Location: San Angelo Texas Posts: 1,518	Dima, I downloaded your sample and looked at the areas your blue arrows point to and under maximum magnification saw nothing but black. I don't see anything to indicate you have a problem with your camera. If what you see appears and disappears you may simply be seeing transient artifacts caused by your monitor. If what you're seeing is on your LCD fold out screen, again nothing to worry about. Just relax and enjoy the camera.

January 22nd, 2009, 03:36 AM	#5
Robin Davies-Rollinson Trustee Join Date: Dec 2002 Location: Gwaelod-y-garth, Cardiff, CYMRU/WALES Posts: 1,215	So can I, but I doubt that you'd notice them on live video...

January 22nd, 2009, 10:37 AM	#7
Dima Vorobiev New Boot Join Date: Dec 2008 Location: Moscow Posts: 5	Well, this screen shot isn’t good example, here are 18sec video in absolute darkness, is there is any one with good FULL HD TV or monitor, I would appreciate if you test this video :) RapidShare: Easy Filehosting

January 22nd, 2009, 12:22 PM	#8
Bob Curnow Regular Crew Join Date: Aug 2004 Location: Sonora, CA USA Posts: 50	Are they dead pixels, or just don't register low light as well as the majority?

January 22nd, 2009, 01:32 PM	#9
Dima Vorobiev New Boot Join Date: Dec 2008 Location: Moscow Posts: 5	Em, sorry? What do you mean? The are some light dots, some of them "walk around the picture" and some of them stand in one place.