Welcome to our community

Be a part of something great, join today!

Log in
  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Blue Pixel in random frames on Scarlet

E

Elliott Balsley

Well-known member
Joined
Mar 18, 2011
Messages
431
Reaction score
0
Points
16
Location
Southern California
Website
www.llamafilm.com
Today I noticed some erroneous pixels in some footage, and I can't figure out what caused it, so I'm hoping someone else can help. In the 400GB we've shot in 2 days, I've noticed this problem on 3 takes of 1 shot. This shot was an underexposed silhouette, racking in and out of focus. At 4K full-debayer, the problem looks like a single pixel of solid blue (white in one case) that is only visible for one frame. I've transcoded all the shots to ProRes already, with no errors, so I know this will be easy to fix with "digital dust-busting", but I want to understand what caused it. The bad pixel does show up in the transcode too.
Here is an R3D snapshot of one of the frames: https://docs.google.com/open?id=0B52QuT8oHvtZN2NuM3J3Y0tSRVU

We're shooting on Scarlet-X, firmware 3.2.21. Shooting 4K Redcode 6:1 at 800 ISO.

I've seen the same sort of blue pixel on Canon 7D footage, but in that case it was persistent, and Canon replaced the whole body under warranty. This time it's only on select pixels, so I wouldn't call it a "dead" pixel necessarily.
 
On a friend's suggestion, we tried black shading the camera, but I continue to see these blue spots still.

Examining one of the snapshots in Photoshop, I realized the bad spot is actually a 5 pixel square, not 1 pixel like I thought before. Now that I'm on the lookout for this, I've seen it in 3 more shots today. It's always in a different place in the frame. And it has happened with multiple RedMags.
 
I sent them an email yesterday. We'll see if they respond. Last night I reinstalled the firmware, maybe that will fix it. Yesterday I got another glitch, this time a larger one. It looks just like a hair in the gate of 35mm!
 
Elliott Balsley said:
I sent them an email yesterday. We'll see if they respond. Last night I reinstalled the firmware, maybe that will fix it. Yesterday I got another glitch, this time a larger one. It looks just like a hair in the gate of 35mm!
Click to expand...

Might have been zapped by a lazer....hope not, that would be expensive to replace.
 
Good idea. But I just did another test, and the pixel is showing up on the SDI output too. I'm recording the SDI feed with a Decklink card, so I can see that it's the exact same location and frame. I think that rules out the SSD, right? Unless the SDI signal from the camera comes after the SSD, but I kind of doubt that.
 
You must log in or register to reply here.
Back
Top