Dead Pixel at DVinfo.net

Craig Bellaire · January 25th, 2005, 03:29 PM

well after getting my first good footage for my DOF Machine I found out I have a dead pixel on my small 1 chip camera... any good fix in post for this? thanks

http://s14.yousendit.com/d.aspx?id=1...Q3P26KOMIDYG8C

Rob Lohman · January 26th, 2005, 03:54 AM

A dead pixel can certainly be removed, however how many manual
labour is involved depends on where this dead pixel is (couldn't
see one on your footage) and what tools you have available to you.

Craig Bellaire · January 26th, 2005, 10:35 AM

well it's in the one third down on the left side of center...I have most all programs to fix but have just never tried and don't know how.. thanks for any help..

Jesse Bekas · January 26th, 2005, 12:31 PM

I have the same problem with my PV-DV851. If a few more show up, it'll certainly be an excuse to get a new cam.

I'm not sure, but maybe a script could be written for Vegas, or a similar NLE, that could automatically remove the dead pixel in every frame, instead of having to do it manually.

Rob Lohman · January 30th, 2005, 04:27 AM

Craig: you usually want a very small blur on that section to merge
it all in etc. Experimenting with different filters is best. How to limit
it to just that one section totally depends on your NLE. In Vegas
you could use a cookie cutter, in others I have no idea.

Craig Bellaire · January 30th, 2005, 07:43 AM

I tried to fix in post... BUT it's gonna take more then just the few minutes I've had to figure this out.. anyway I'll keep trying.. Thanks for all the help

Ron Evans · January 30th, 2005, 09:30 AM

You need to create a travelling matte to mask it. Find a scene with a black backround that really highlights the bad pixel. Capture this frame, in Photoshop or similar program create from this frame a graphic with the pixel ( when zoomed up in Phototshop it will be a small pixel group) in black and the rest white/transparent. In Premiere follow the instruction for a travelling matte with this graphic offset by a few pixels ( you need to experiment to find the best offset for your material and may find it easier if the defect is expanded a little for this approach and different offsets for different scenes). This of course will entail rendering the whole video but I have used this approach successfully to mask pixel defects. I use Premiere so do not know how to use travelling matte in other software. As far as the camera is concerned most single pixel defects can be masked by service, infact as long as the defects are not on the same column then a lot can be fixed by the service technician.

Ron Evans

January 25th, 2005, 03:29 PM	#1
Craig Bellaire Major Player Join Date: Aug 2004 Location: Rochester, NY Posts: 422	Dead Pixel well after getting my first good footage for my DOF Machine I found out I have a dead pixel on my small 1 chip camera... any good fix in post for this? thanks http://s14.yousendit.com/d.aspx?id=1...Q3P26KOMIDYG8C __________________ Craig Bellaire www.VerticalVideoSolutions.com

January 26th, 2005, 03:54 AM	#2
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	A dead pixel can certainly be removed, however how many manual labour is involved depends on where this dead pixel is (couldn't see one on your footage) and what tools you have available to you. __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

January 26th, 2005, 10:35 AM	#3
Craig Bellaire Major Player Join Date: Aug 2004 Location: Rochester, NY Posts: 422	help well it's in the one third down on the left side of center...I have most all programs to fix but have just never tried and don't know how.. thanks for any help.. __________________ Craig Bellaire www.VerticalVideoSolutions.com

January 30th, 2005, 04:27 AM	#5
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Craig: you usually want a very small blur on that section to merge it all in etc. Experimenting with different filters is best. How to limit it to just that one section totally depends on your NLE. In Vegas you could use a cookie cutter, in others I have no idea. __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

January 30th, 2005, 07:43 AM	#6
Craig Bellaire Major Player Join Date: Aug 2004 Location: Rochester, NY Posts: 422	That's what I'm playing with I tried to fix in post... BUT it's gonna take more then just the few minutes I've had to figure this out.. anyway I'll keep trying.. Thanks for all the help __________________ Craig Bellaire www.VerticalVideoSolutions.com

January 26th, 2005, 12:31 PM	#4
Jesse Bekas Major Player Join Date: Mar 2004 Location: Ridgefield Park, New Jersey, USA Posts: 572	I have the same problem with my PV-DV851. If a few more show up, it'll certainly be an excuse to get a new cam. I'm not sure, but maybe a script could be written for Vegas, or a similar NLE, that could automatically remove the dead pixel in every frame, instead of having to do it manually.

January 30th, 2005, 09:30 AM	#7
Ron Evans Inner Circle Join Date: Mar 2003 Location: Ottawa, Ontario, Canada Posts: 4,222	You need to create a travelling matte to mask it. Find a scene with a black backround that really highlights the bad pixel. Capture this frame, in Photoshop or similar program create from this frame a graphic with the pixel ( when zoomed up in Phototshop it will be a small pixel group) in black and the rest white/transparent. In Premiere follow the instruction for a travelling matte with this graphic offset by a few pixels ( you need to experiment to find the best offset for your material and may find it easier if the defect is expanded a little for this approach and different offsets for different scenes). This of course will entail rendering the whole video but I have used this approach successfully to mask pixel defects. I use Premiere so do not know how to use travelling matte in other software. As far as the camera is concerned most single pixel defects can be masked by service, infact as long as the defects are not on the same column then a lot can be fixed by the service technician. Ron Evans