HDRx Overview...

[sergio arguello]

They just shut down the tread I started about that system a couple hours ago.

It's a pity...

sir ive read your posts for some time and perhaps the squeaky wheel gets the grease...just may not be the grease your looking for mate!!

 

[Rob Ruffo]

Correction:

By DxOMark website Canon 5DMK2 DR was rated @ 11.86 Ev.

See the attachment or visit DxOMark website >>>

Sanjin, dynamic range is subjective. We rate the MX, using noise reduction, at 14 stops. Without at 13 stops.

Using the same standards about what is acceptable we rated the 5D at 8.5 stops in video mode, under daylight conditions. The DxOMark webiste is rating the camera in stills mode, most likely recording to raw files. Using the 5D as a stills cam DOES provide usable, professional results, although even here using Red as a stills cam will be better, and 12MP is more than enough especially when color is better.

 

[Uli Plank]

This is very similar to our observations. The 5D has not much more than 10 – maybe 10.5 – stops in photography, but hardly 8.5 in video. And these numbers are generous, given the fact that we rate the MX at 12.5 stops without post-processing.

 

[Sanjin Jukic]

Sanjin, dynamic range is subjective. We rate the MX, using noise reduction, at 14 stops. Without at 13 stops.

Rob,

I didn't measure exactly DR but made with MX some tests to push a footage till ISO 6400 and then using a noise reduction have got pretty impressive result.

Also I could say the that I reached between 14 to 15 stops of DR or even more...!!!

Here is the test report about it

MX @ ISO 6400 - Workflow explained >>>

 

[Michael Brennan]

The difference in skin tone rendition between video and film has nothing to do with the limitations of 10 bit log recording formats. It's because of the differing spectral response.

Yes I acknowledged there is a different response but do think more bits would narrow the gap.

In your post you say that you dont think there is much of a difference between DSLR and film, to me this is an indicator that a 14 bit AD plus 14bit RAW recording of a decent DSLR camera allows for more tonality in skin compared to 10 bit systems.

My point is that I believe response of film has been understandably, fine tuned over the decades to maximise tonality in skin.


In the same way log recording is tailored toward shadows, perhaps allocation of bits that are tailored to pack more colours/tone in skin tones could be the equivalent of film chemists loading the dice?


This notion derived from discussion with retired senior chemists at Kodak and Sony geeks. Would be useful to test the notion if someone knows how to map a 14bit AD!


Mike Brennan

 

[Simon Falkentorp]

Lack of eHDR™

Lack of eHDR™

In the closed thread of "HDRx™™ scoop" Jim Jannard wrote:

I think you can say goodbye to eHDR™™. No final judgment but I'm leaning that way. Think "pro".

I like this approach from the viewpoint of filmtalent development.

When kids and young learn photography in todays (danish) media schools, they use small compact still cameras.

When I was 12-15 and was teached photography, we used manual Nikormat "tanks" with good Nikkor glas - and learned the Love of "picturehandcraftsmanship".

Therefore: Provide the tools of Tomorrow to the film talents of Tomorrow, oh yes. But in a way that doesn't dozes but arouses their creativity!

And therefore I welcome the lack of eHDR™, also in Madam Scarlet, which I would love to put in the hands of even very young film talents in a Film & Media School of Tomorrow in Denmark.

Simon Falkentorp

 

[Tim Whitcomb]

There is also a big difference between a "science project" and a deliverable camera.

Jim

especially one by Warrick University which measured the 5D at 14 stops? We are lucky to get 5 stops in post! Would love to see that test chart... kind of makes one suspect of their claim of 20 stops of HDR. 1080p? meh

And yah, now lets see them mass produce that... its highly probable an asian RED competitor will buy that tech though.

 

[Hrvoje Simic]

Thanks to over-analysing of picture quality on a feature presenting post in a feature testing stage,
no 16 bit tiff or .r3d to fully show what was actually meant to be shown...usability of DR.

 

[PatrickFaith]

Once I record HDRx... what do I do with it?
The power of HDRx is the multiple options you have to use it.
...
4. You can combine with a variety of additional new tools created by Graeme Nattress for a multitude of creative options.

Exporting to EXR will give you a multi-view EXR with both exposures (like a stereo EXR).

Jim

I'm using hdrx as texture emitters in my vfx pipeline, for example I take a shot of a side of a room that has a window and walls, then when I do my ray tracing I don't have any "lights", but i turn that texture into a emitter to ray trace my scene (a few of these texture/emitting/walls gives excellent light feel ... especially as reflections/water/oil/glass will "mirror" correctly on images).

My problem is when I shoot into a window/wall combination, it has a huge dynamic range and I'm clipping and getting too much blue on the image with the longer exposure. What I think I need to use is this 4th "Graeme" method, and mix the A and X image in linear with a curve/color cuttoff on the A as it clips into blue. My question is how exactly do I do this openexr "graeme" merge so it keeps the entire image linear(i.e. where is the utility ... or is this one of those other things i need nuke for)?