January 23, 2016 at 6:42PM

2

Panasonic G7 Weird Halos and Colors

Hi everyone, first time posting, so I hope it's not too ridiculous.

I have a Youtube channel where I post mostly Tango performance Videos and some shorts and stuff. The light is ridiculously bad most of the time and I shot with a Panasonic G6 until recently. Now I got a G7 and have two problems (and please don't recomend an A7S, I know that would be a better solution, but out of my budget for the moment)

- I shot a performance yesterday and had a weird effect I never saw before. I know ISO 6400 is not ideal, but better than complete darkness.
In this picture you can see around their legs some halos. Is it noise reduction? Hi ISO effects?
http://030tango.de/wp-content/uploads/2016/01/Testpicture_ISO6400.jpg
You can actually see through her legs...

- And then the colors are a bit off I think. Before I used the standard picture profile and film convert for grading. The G6 has the same sensor as the GH2 (which I also own for recording whole concerts without the 30 minute limit) and the GH2 presets worked nice for the G6. With the G7 I thought I use Cinelike D and that preset from the GH4, but it looks kind of weird... anyone has the G7 as a b-cam and compared it to the GH4?

Thank you for your help already!

4 Comments

Wow, that's a terrible image. ( sorry ) I normally don't shoot higher than 1600 ISO with my GH4, and will use 3200 ISO in emergencies.

To fix this problem I would suggest a few things. Start by testing the following camera settings at ISO 800 / 1600 / 3200 / 6400 ( shoot footage at each of these ISO speeds )

Camera Profile : Natural
Contrast : -5
Sharpness : -5
Noise Reduction : -5
Saturation : 0

I would try and shoot footage under similar conditions to when you shot the footage that your frame-grab was taken from.

When you bring your footage into your editor you are going to need to add sharpness because we have eliminated all in-camera sharpening. You will have to play around with your editor to figure out how much you want to sharpen your footage. I edit with Sony Vegas Pro and usually add a very low amount of sharpening to my footage. ( you probably have a few algorithms to choose from, so try a few of them until you find one you like best )

Next, if you have a noise-reduction feature in your video editor you will want to use this to reduce some of the image noise. In-camera noise reduction destroys detail, which is why I almost always have it set to it's lowest setting when I shoot, and using noise-reduction with your video editor usually produces much better results. I use the NeatVideo noise-reduction software to reduce noise in post.

Now try comparing your sharpened and noise-reduced footage at different ISOs to see how your image compares at different ISO speeds. You should find an optimal shooting speed that is acceptable to you, it might even be the 6400 ISO, but I have my doubts. Most likely you are going to find that either 1600 ISO or 3200 ISO is as high as you want to go and still get a good image from your camera.

So once you've figured out what your maximum ISO shooting speed is, all you can do to shoot under dimmer light is to either use a faster lens or find a way to add your own lights to the location. I have shot in large rooms by mounting Lowel 750 watt Tota-Lights on tall light stands and bouncing their light off the top of the wall or off the ceiling if it's not in the shot. These are very bright and compact low cost tungsten lights that are great a lighting up a large space and allow you to shoot at 800 ISO or lower in most situations.

I chose the "Natural" camera profile because it's pretty fool-proof, produces nice color, and doesn't have the noisy-shadow problem that the Cine-D setting has at high ISO settings. ( under "flatter" lighting I will also shoot with the "Standard" profile with similar settings )

If you can, post your results and let us know what you think are usable settings for your G7 camera.

January 23, 2016 at 9:13PM

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Guy McLoughlin
Video Producer
32497

I own the G7 myself, and I can tell you that I have no problem whatsoever in going up to 1600 ISO if that gives me a better exposure than 800 ISO. After a slight pass of denoising and sharpening in post, it's as good as if I had shot at 800 ISO. And 3200 ISO is absolutely usable as well, as long as you get a good exposure out of it.
I find the low-light performance of the G7 to be very good, just awful in the shadows. You can actually get less distracting noise by bumping to 3200 ISO and having a well exposed image than shooting at 1600 and having an under-exposed image. And if you get a good exposure, 3200 ISO is very usable after only a bit of denoising in post.
That said, your image is way underexposed, and at 6400 ISO that spells disaster. That weird halo might be the in-camera NR, I don't know. Keep in-camera NR down, always. And don't shoot Cine-D if you're going to use high ISO's. The noise it produces is very ugly. Use Natural or Standard profiles for less awful noise.
In your case, the only solution is to get faster lenses or lights to brighten the scene. I find that even as low as 1600 ISO, the G7 does an awful job in the underexposed areas. A little tip: maybe it's not a great help for you, as you're shooting people dancing, but if there's little movement in your shot, using a shutter speed of 1/40 instead of 1/50 doesn't hurt.

January 24, 2016 at 7:31AM, Edited January 24, 7:32AM

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José Pedro Pinto
Wannabe
631

you don't need to be sorry, i know that. it's probably the worst i ever had.

thanks for the answers, i will test that out and the 12-35/2.8 is on my list next for sure.

sometimes i go as far down as 1/25 (1/40 makes weird flickering a lot of times with the cheap dimmers everyone is using) but then it's get's very mushy. i would like to aim for 1/100th actually in the videos but it rarely is doable (here it was possible https://www.youtube.com/watch?v=LHzzbF8wAGY)

thanks a lot again, will test around these days and see how it works out (and post if i find some nice solution)

January 25, 2016 at 11:45AM

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so i did rent the panasonic 12-35/2.8 and the olympus 12/2 to test a bit (actually would have wanted to try the slr magic 12/1.6 but my local rental didn't had that)

the original stuff, straight out of camera in UHD is here
https://www.youtube.com/watch?v=WGlRCBdw4Ug

panasonic with neat video and film convert is here
https://www.youtube.com/watch?v=vIwn2T-QnYg
and olympus with neat video, film convert and some digital zooming (that possible is quite important for me, either optical or digital)
https://www.youtube.com/watch?v=SQwZItlP86s

would be nice to hear what you think

January 30, 2016 at 8:44AM

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