GH4 GH4 V-log?

joe12south said:
Panasonic very much likes to adhere to "standards", so I highly doubt we'll ever see an odd ball resolution. (Though I'd love to see it, if only to get a winder FOV.) ...
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They're doing "odd" in DVX200, 13 MPX oversampling for 4K.
 
stoneinapond said:
I doubt there will be in-camera LUT monitoring.
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So in a nut shell... To monitor the newly added V-Log with a LUT applied & anamorphic mode de-squeezed properly you need to add something along the lines of an Odyssey7Q+ and say a pair of drives, which effectively turns the GH4 into a $4600 camera.
 
joe12south said:
I'm basing this off of Nick Driftwood's test files. I did not see the CINE-D color errors that are so hard to fix. Obviously, until I can get some charts shot under controlled lighting, I can't know how great a different there is, but based on what I have been able to see so far, it looks like a meaningful improvement.
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If what V-log does is map it's luminance levels to a standard gamma curve I would think colors are automatically "standardized".
 
I thought the anamorphic cropping was oddball. That gave me the idea that I bet they could expand beyond 4K a few more pixels
 
David W. Jones said:
So in a nut shell... To monitor the newly added V-Log with a LUT applied & anamorphic mode de-squeezed properly you need to add something along the lines of an Odyssey7Q+ and say a pair of drives, which effectively turns the GH4 into a $4600 camera.
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See newly released "Ninja Assassin" from Atamos. Pretty sure it does all that. :)
 
Lintel said:
See newly released "Ninja Assassin" from Atamos. Pretty sure it does all that. :)
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Well that drops it down to around $3100 then.

Although you are then limited to HDMI only, which would limit your future camera purchase compatibility.

Also I was not impressed with the quality of the 2 Shoguns I rented, which is why I didn't purchase one.
 
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joe12south said:
Greg_E said:
OK, there's the answer that some have been looking for, 8 bits is really not enough for this unless close attention is paid to exposure. So to do this correctly, you still really need an external recorder.
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Poppycock, I say. Much more opinion than fact. 10-bits of precision is nice to have for many applications, but the difference has to do with precision between maximums) not the maximums themselves. An 8-bit and 10-bit signal can both capture the same DR, so the same exposure.
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Sorry, but I found "poppycock" to be an unpersuasive argument. Here's my detailed analysis of the drawbacks of using V-Log-L with an 8-bit H.264 encoder:

[h=1]Panasonic V-Log-L - the Seven-Bit Solution for the GH4?[/h]
 
walkaboutcamera said:
Illya

you once posted that we will not see a third party knock of the YAGH. This came from seeing what is inside the box, and maybe I would add, some inside knowledge you might be privy to. Do you get any sense that there might be untapped processing power beyond what it does now that the camera processor can make use of to provide more advanced features?
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(publicly) about all I can say is that I am surprised that the community of camera hacking has not really gone after the GH4.

People who shop with HRC get some unique benefits of this work we are doing, including information- early access to product information, technical support and firmwares, including V-Log-L (and others) and special unadvertised pricing.

Sadly, we've had to decided to keep all the really good information inside our circles, rather than public & external.

After you shoot the GH4 V-log-L, regardless of bit-depth recording, I don't think anyone shooting a GH4 for "cinema" will want to shoot with the other modes. As the V-log makes it very easy to set your exposure, even if you are monitoring only in camera.
 
Illya Friedman said:
(publicly) about all I can say is that I am surprised that the community of camera hacking has not really gone after the GH4.
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Now that right there is a golden nugget of information.

If we're talking about RAW then that's exciting. It was mentioned by Panasonic as a possibility very early on.

Full sensor readout at full resolution (4.6K or whatever it is) would also be amazing just for the impact it would have on focal length and DOF.

10bit internal would be interesting (preferable to RAW really) but general consensus seems to be that won't be possible. Don't know why.

My guess is one of the first two. GH4R could stand for "RAW" or "Resolution"(e.g. 4.6K) (as with the A7R).

Digital Image Stabilization (as with NX1 firmware upgrade)? Would be great. Plausible in 4K mode I guess due to cropped use of sensor.

The Camera Store review of the G7 noticed that it had superior noise and colour performance in low light. I guess there could be a tweak in firmware to align the GH4 with the G7 here (the tech is the same isn't it?).

I suppose higher bitrate 4K could be inferred from Illya's "hacking" comment. Would be nice actually. Just slightly finer grain would do a lot for the image IMO.

Any of the above sound great to me. Who knows! Exciting stuff. Hope we don't have to wait another year to discover what all the cloak and dagger stuff is about this time though!
 
Bern Caughey said:
Suggest you research Lpowell. He works for Dolby & authored (IMO) the best GH2 patches.

And he is correct. The vast majority of users will want to apply a Lut, both to their monitor(s), & especially in post.

I shoot Log regularly & wouldn't without Luts.
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I don't care who he works for...equating a LOG gamma curve with tweaking contrast and saturation is goofy.
 
Not necessarily. There is interplay, too be sure, but luminance response can be dead on, and color accuracy can still be off.
 
joe12south said:
Bits are nice, but they're not all equal. Your detailed analysis ignores how the human visual perception works. You can sacrifice a lot of precision in highlights and never see the loss.
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That's right, who needs those pesky bits when you've got logarithms working for you?
 
Illya Friedman said:
(publicly) about all I can say is that I am surprised that the community of camera hacking has not really gone after the GH4.
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Is this a veiled reference to Magic Lantern? ML seems to be quite Canon specific. No doubt that a RAW GH4 4k image would be quite a nice image to work with. No idea how to get that train started though...
 
Lpowell said:
That's right, who needs those pesky bits when you've got logarithms working for you?
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He was saying that you can put more compression in the highs and then alocate the bandwith you "saved" to where the curve is less flat.
 
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