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Checking for dead and "over excited" pixels.


Saul Oliveira
 

Hi guys, hope everyone is ok.
 
During checkout, do you follow any specific procedure to check if the sensor in your camera has any dead or "over excited" pixels?

Best Regards
Saul Oliveira
First AC
Spain


kokkie dewilde
 

Hello,

During cam tests I always register 
1: a take with a white board overexposed
2: a take with a lens cap covering ( complete black)

Afterwards is check the files on a big screen in full resolution to check dead pixels. (Make sure you have a good monitor, you’e not able to see dead pixels on every monitor, it helps to push contrast, aperture…)

And yes, it happens a lot!

Kind regards
Wouter


Op 14 apr. 2020, om 10:11 heeft Saul Oliveira <oliveira_saul@...> het volgende geschreven:

Hi guys, hope everyone is ok.
 
During checkout, do you follow any specific procedure to check if the sensor in your camera has any dead or "over excited" pixels?

Best Regards
Saul Oliveira
First AC
Spain


Saul Oliveira
 

Hi Wouter, 
do you "help" the camera "unmask" such pixels by selecting any concrete or extreme ISO or exposure time settings?

Saul Oliveira


sameer shrivastava
 

I generally check with edge focus detect on at 3 levels. Hasn’t failed me yet. Even 1 pixels shows easily on a 5” monitor.
1.Complete black with lens or body cap
2. Complete white over exposed
3. Middle grey
Here is a pic with many dead pixels 
image1.jpeg

Here this one has only 1 pixel which would show on grey or white
image2.jpeg

On Apr 14, 2020, at 2:23 PM, Saul Oliveira <oliveira_saul@...> wrote:

Hi Wouter, 
do you "help" the camera "unmask" such pixels by selecting any concrete or extreme ISO or exposure time settings?

Saul Oliveira


Jose del C Martinez
 

Hi Guys

  I do have a question. What is an over excited Pixel?

Jose del C. Martinez,SOC
Cinematographer/Gaffer
(646) 600-2021 NY
(323) 989-2593 LA
 


On Tue, Apr 14, 2020 at 4:11 AM Saul Oliveira <oliveira_saul@...> wrote:
Hi guys, hope everyone is ok.
 
During checkout, do you follow any specific procedure to check if the sensor in your camera has any dead or "over excited" pixels?

Best Regards
Saul Oliveira
First AC
Spain


Saul Oliveira
 

Hi Jose, 

sorry, it is probably my fault to use an arbitrary word. I think they call them Stuck Pixels. As I understood it is a misbehaving pixel that is all the time providing its maximum (or so) output voltage no matter how much light it is exposed to.  They seem to be green, blue or red in color most of the time. 

Anyone is free to correct me please.


Jeremy Garchow
 

A pixel that has fallen from grace in a blaze of glory, leaving no color behind.

--

Chicago, IL, USA
Production and Post

On Apr 14, 2020, at 9:31 AM, Jose del C Martinez <jcmuni1@...> wrote:

Hi Guys

  I do have a question. What is an over excited Pixel?

Jose del C. Martinez,SOC
Cinematographer/Gaffer
(646) 600-2021 NY
(323) 989-2593 LA
 


On Tue, Apr 14, 2020 at 4:11 AM Saul Oliveira <oliveira_saul@...> wrote:
Hi guys, hope everyone is ok.
 
During checkout, do you follow any specific procedure to check if the sensor in your camera has any dead or "over excited" pixels?

Best Regards
Saul Oliveira
First AC
Spain




Art Adams
 

A pixel that has fallen from grace in a blaze of glory, leaving no color behind.

 

I’m saving this.

_______________________________________________________
Art 
Adams
Cinema Lens Specialist
ARRI Inc.
3700 Vanowen Street
BurbankCA 91505
www.arri.com 

 
aadams@...

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