Timelapses & Color: nasty artefacts

[Trevor Meier]

In reference to this discussion...

The problem persists... Timelapse footage is unusable when using the native RAW workflow with Color. The problem is caused by Color's export from the 2K layer and the inability of the camera to properly black balance for long shutter integration times (e.g. 1/2 sec in the attached file).

Here's a 100% crop from Apple Color's 2K output. Any timelapse footage starts to look like this when debayered at 2K. The solution is to manually re-export these clips using a full debayer in RedAlert. Make sure you turn OLPF compensation (sharpening) OFF in RedAlert or you'll get the same results.

A big PITA compared to the beautiful, smooth native Quicktime workflow...

[EDIT: Reduser file attachments don't seem to be working for me. See the crop at this link: http://inspiredcinema.com/priv/ic/timelapsecrop.jpg ]

 

[Mel Matsuoka]

Yup...I ran into the exact same problem a week or so ago. The RAW playback in Color looks fine, but once you hit Render, you get the awful sparklies.

I too figured out that the only workaround for this is a full-debayer, self-contained render out of REDAlert. But in my case, while this eliminated the wierd sparklies, you can still see a layer of static noise in the image, very similar to what ground glass looks like when its not in motion. Thankfully this noise is imperceptible in standard-def, so it wasn't an issue for the commercial I was working on, but you can definitely still see it in HD.

What's interesting is that the speckles show up as pure white, when rendered out of Color. But when you bring the shot into REDCINE, they show up as multicolored speckles that appear to match REC709 Primaries.

 

[Trevor Meier]

Anyone from Red care to comment? Graeme?

 

[mikeburton]

I've had the same issue many times. RedRushes at full debayer to ProResHQ was my workaround where the white pixels went away.

 

[Uli Plank]

Same here. You need a full decode for longer exposure times.