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  • 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 :)

RED 8K Sensor Test 2017

Anton Shavlik said:
I posted earlier in this thread about why I think the helium might have a bit lower dynamic range in the shadows. I decided to run some rudimentary tests. What I think is going on is that the helium sensor actually can see as much as the dragon. But, helium's design has a bit more fixed pattern noise. Red has decided that no fixed noise will make it into their images, so they have absolutely crushed any noise at the level that the fixed pattern noise appears. The red and blue channels are noisier than green, so they get crushed at a different point, side effect is that the shadows get a green cast as the green channel is still usable after red and blue are crushed and sticks around.

Proof is, do a black shade at 1/4 second. Run that at 24fps 180 degrees, 3200 iso STH OLPF or use FLUT +1 or +2. Expose your image correctly et voila, no green cast.

Both of these are white balanced to the light just off screen, 3200 iso FLUT +2 STH OLPF

1/4second blackshade, green T red E

I wouldn't shoot with this, the noise flickers and if you go even one stop darker than what I've exposed for here the blacks become a bright blue with noise (perhaps because this is a tungsten balanced light). This is the absolute most extreme case, what would be 256,000iso on LLO OLPF
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Are you saying that manual Black Shade yields much better results than auto Black Shade?
 
Graeme just responded to me that what I'm seeing isn't or shouldn't be typical. But yes, manual blackshade is making my shadows much less green at the moment. Dunno if my camera is having issues but if your helium has green shadows then manual blackshade looks to me like a workaround for now. Only takes a few minutes to try for yourself.
 
Anton Shavlik said:
Graeme just responded to me that what I'm seeing isn't or shouldn't be typical. But yes, manual blackshade is making my shadows much less green at the moment. Dunno if my camera is having issues but if your helium has green shadows then manual blackshade looks to me like a workaround for now. Only takes a few minutes to try for yourself.
Click to expand...

Mine haven't had green shift since the recent update, but curious if there was something to that. Glad Graeme chimed in. Hope yours gets fixed then.
 
What about color noise? Straight out of box shot Epic-W at iso 1000, 8K 23.98 nice solid histogram and notice a lot of color noise.
Likely I should have black shaded first? It can be eliminated with light noise reduction and result looks great (posted on RED FB), but first time I have ever seen in RED camera with fat histogram.
 
Phil - how did you upload to YouTube? I assume you created a ProRes 8K master on a Mac? (myself, I'm looking for a PC solution)
 
Up until ISO 800 I can barely see past the 14th patch on VV, but I do suspect that's the result of YouTube's compression hiding those dark few patches. I'd really like to see a still image from the Xyla chart that's not via frame-averaging to get a better idea of what's usable from the sensor.
 
Kemalettin Sert said:
Phil do you think this test needs a update with IPP2?
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It does and not just because of IPP2, but also new Calibration hitting Helium. I will re-run it when IPP2 is officially released. Not really a point to do it now, but maybe.
 
also new Calibration hitting Helium
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That sounds intriguing!!

off topic

Phil I get newsletters and updates from "Projekt" records and one said that "DiN" was back in stock, Is that you?
 
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