Is this a bad camera pixel..? at DVinfo.net

Joe Cronin · May 14th, 2010, 11:49 AM

Recently shot footage for a timelapse video in beautiful Moab Utah with my Canon XH A1S...there is a small speck that is consistent but becomes less prominent with more sunlight..I don't know how to highlight it in this snapshot..but it is easy to see. It was very cold that day if that matters. Can it be repaired?....click on image to blow it up.

Matthew Amirkhani · May 15th, 2010, 06:13 AM

Hi Joe,

I see a white dot right in the middle of the picture. If that's what you're referring to then yes it's noticable.

Keep in mind that any dead pixel is bad and you don't wnat them!!
I am sure that your XHA1s is still under warranty so have it repalced or repaired ASAP.

Matthew

Jay Bratcher · May 19th, 2010, 12:03 PM

I don't think it's a hot pixel, because I believe a hot pixel would not show up as white on a 3 chip camera, since white is achieved by mixing colors from each sensor - unless I don't understand how this works - which is entirely possible...

It looks like the spot is 1 pixel wide, it is at least 2 pixels high, and has a halo around it. Since HDV stretches the image from 1440 to 1920 pixels, I think it would be wider and shorter if it was a hot pixel. My guess is that this is something on your lens, or possibly inside your lens.

If you want to test for a hot pixel though, see if it shows up with the iris closed. If it does not show up with the iris closed, then it's almost certainly a foreign object. As for sunlight reducing it's visibility, that could be due to the iris stopping down...

Joe Cronin · May 20th, 2010, 09:09 PM

Thank you both for the constructive responces...I believe it is something on the lens because it wasn't a problem before or after the shot...maybe a snow crystal..there were some flurries. Now I need to figure out how to "fix" the spot..any software suggestions? I use Vegas Pro but I don't think there is a tool for this in Vegas.
Thanks again,

Joe Cronin

Chris Barcellos · May 20th, 2010, 11:33 PM

In Vegas, you can use the Cookie Cutter filter, to punch a hole in the shot feather the edges, and the run something on the lower track to match the terrain. You could even take the same footage run it on the second track, but move it over or up and down one or two pixels.

Howard Churgin · May 21st, 2010, 04:47 AM

You can clone in out using after effects. Similar to photoshop cloning except depending on the clips movement you will have to animate the mask or clone whatever way you use.

Khoi Pham · May 21st, 2010, 07:19 AM

Quote:

Originally Posted by Joe Cronin

Thank you both for the constructive responces...I believe it is something on the lens because it wasn't a problem before or after the shot...maybe a snow crystal..there were some flurries. Now I need to figure out how to "fix" the spot..any software suggestions? I use Vegas Pro but I don't think there is a tool for this in Vegas.
Thanks again,

Joe Cronin

When you turn the camera off for a few seconds, it will automatic mask it, but it will always be there, here is a test you can do, cover the lens with the lens cap and shoot at slow shutter speed at 15th/second and gain at 12db for a few minutes and see if it will show back up.

May 14th, 2010, 11:49 AM	#1
Joe Cronin New Boot Join Date: Dec 2009 Location: San Rafael, California Posts: 13	Is this a bad camera pixel..? Recently shot footage for a timelapse video in beautiful Moab Utah with my Canon XH A1S...there is a small speck that is consistent but becomes less prominent with more sunlight..I don't know how to highlight it in this snapshot..but it is easy to see. It was very cold that day if that matters. Can it be repaired?....click on image to blow it up. Attached Thumbnails

May 15th, 2010, 06:13 AM	#2
Matthew Amirkhani Major Player Join Date: Jan 2007 Location: Toronto, Canada Posts: 279	Hi Joe, I see a white dot right in the middle of the picture. If that's what you're referring to then yes it's noticable. Keep in mind that any dead pixel is bad and you don't wnat them!! I am sure that your XHA1s is still under warranty so have it repalced or repaired ASAP. Matthew __________________ Canon XHA1, Brevis 35mm, Manfrotto 028,501,Vegas Pro 10e

May 20th, 2010, 11:33 PM	#5
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	In Vegas, you can use the Cookie Cutter filter, to punch a hole in the shot feather the edges, and the run something on the lower track to match the terrain. You could even take the same footage run it on the second track, but move it over or up and down one or two pixels. __________________ Chris J. Barcellos

May 19th, 2010, 12:03 PM	#3
Jay Bratcher Regular Crew Join Date: Jan 2009 Location: Round Rock, TX Posts: 110	I don't think it's a hot pixel, because I believe a hot pixel would not show up as white on a 3 chip camera, since white is achieved by mixing colors from each sensor - unless I don't understand how this works - which is entirely possible... It looks like the spot is 1 pixel wide, it is at least 2 pixels high, and has a halo around it. Since HDV stretches the image from 1440 to 1920 pixels, I think it would be wider and shorter if it was a hot pixel. My guess is that this is something on your lens, or possibly inside your lens. If you want to test for a hot pixel though, see if it shows up with the iris closed. If it does not show up with the iris closed, then it's almost certainly a foreign object. As for sunlight reducing it's visibility, that could be due to the iris stopping down...

May 20th, 2010, 09:09 PM	#4
Joe Cronin New Boot Join Date: Dec 2009 Location: San Rafael, California Posts: 13	Thank you both for the constructive responces...I believe it is something on the lens because it wasn't a problem before or after the shot...maybe a snow crystal..there were some flurries. Now I need to figure out how to "fix" the spot..any software suggestions? I use Vegas Pro but I don't think there is a tool for this in Vegas. Thanks again, Joe Cronin

May 21st, 2010, 04:47 AM	#6
Howard Churgin Regular Crew Join Date: Nov 2008 Location: Marlboro, NJ Posts: 85	You can clone in out using after effects. Similar to photoshop cloning except depending on the clips movement you will have to animate the mask or clone whatever way you use.