HDRx motion interpolation

[Jannard]

The light streaks precede the pinpoints from the underexposure portion of the HDRx™. If you look at the headlights of the fire truck, the streaks shoot out ahead of them, rather than trailing behind. This indicates that the two exposures start at the same time, with the underexposure ending first. It's like a first curtain sync when using strobes on a still camera.

A while ago, a lot of people were speculating about how HDRx™ works. I don't think anyone official ever said how it does works, but a lot of suggestions were officially ruled out. If I recall correctly, Jim specifically said that there are not two different exposures from two non-overlapping spans of time, as this would create double image problems. My apologies if I'm putting words in your mouth, Jim, and I hope you're correct me!

That is not correct.

Jim

[Gunleik Groven]

That is not correct.

Jim

Which part? :-)

[Adam C Lubkin]

Regarding monitoring paths for HDRx™:
Seems like the best and probably obvious thing is just to make a user programmable button that switches the view between the normal and highlight track, just as we now often switch from Redcolor to Raw. I think I would prefer that to an in camera combination of some kind. I guess I'm hoping the design of the camera reflects the fact that many of us would like to keep track of exactly what parts of the image are augmented by this technology.

IBloom

That would be great, especially if the histogram switched as well to reflect the exposure of the track being displayed. I don't know if that's possible but it would be awesome if it was.

[Tim Nolte]

That is not correct.

Jim

Presumably you mean the part about denying two separate exposures. My apologies. I've edited my original post so no one gets the wrong idea if they stumble across it in search or something.

I looked at some past posts, and I think I must have been extrapolating from posts like these:
(I know, I know, you hate when people read into things! I'm really trying to quit! )

In keeping with RED philosophy... a new way. :-)

Jim

Nope... "just two exposures" gives disjointed (unconnected and stuttering) motion.

Jim

[Jannard]

Presumably you mean the part about denying two separate exposures. My apologies. I've edited my original post so no one gets the wrong idea if they stumble across it in search or something.

I looked at some past posts, and I think I must have been extrapolating from posts like these:
(I know, I know, you hate when people read into things! I'm really trying to quit! )

With all due respect, I wish people would quit trying to interpret what I am saying. No one seems to get it right. You can't take part of a sentence and build the whole story. At some point we will make it clear exactly what is going on.

Jim

[chrislancaster]

I dont think its our job to figure out how it works.. thats RED's


all we should care about is that it does work and how to make best use of it


I mean why do you care ? are you guys building cameras or are you creating images??


Jim I cant wait to purchase an Epic...!!

[Patrick Ready]

Whether the use of HDRx™™ is deliberate or not, and given that it is intended to be a tool in post, is there an argument why it wouldn't be enabled on every frame shot? In every situation?

[Tim Nolte]

I dont think its our job to figure out how it works.. thats RED's


all we should care about is that it does work and how to make best use of it


I mean why do you care ? are you guys building cameras or are you creating images??


Jim I cant wait to purchase an Epic...!!

I strongly disagree. Having at least some understanding of how the tool works means I better understand the potential uses and limitations. As such, I appreciate the more detailed explanation Jim just posted.

[Tim Nolte]

With all due respect, I wish people would quit trying to interpret what I am saying. No one seems to get it right. You can't take part of a sentence and build the whole story. At some point we will make it clear exactly what is going on.

Jim

I think we got crossed wires here or something. I was trying to apologize, and concede the point, but you seem to have taken it in some other way. Again, I'm sorry for any offense.

Funny enough, but the longer explanation you've since posted in a separate thread more or less exactly matches my prior understanding. "Motion-conjoined," as opposed to any gap in time between exposures, is what I was trying to describe. Apparently I didn't do a very good job.

[Jeff Coatney]

They're stored in tracks in a singular R3D.
In RCX you'll be able to view the each track or the hdr blend.
Exporting to EXR will give you a multiview EXR with both exposures (like a stereo EXR).

But essentially we're frame interleaving here, right? There's no surplus bandwidth to write the frames at "the same time". And the X track exposure correction is a function of time between read-reset cycles. This would account for the unique motion blur that be achieved. Also the efficiency of making this part of a single R3D stream so the media can handle it. But in theory, the X track could be the "first" frame in the sequence giving the motion streak of the A track as a trailing, comet-tail effect, right?