GH4 Green Color Cast

E

equinox-ps

New member
I'm a new Panasonic shooter, I just picked up my GH4 a few months ago. Since then, I've been getting green/yellow color casting to varying degrees. I get this across all profiles, all WB setttings (manual or preset) and in just about any type of lighting condition. I've troubleshooted extensively and have ruled out monitors, glass, lighting etc. I haven't been able to find any information from other users reporting this degree of color casting.

I shot some outdoor footage last evening with tons of light available. I used manual white balance and a white sheet of paper to set it. I had to add up to 25 points of Magenta to the footage to compensate for the green color cast in Premiere. I'm shocked by how bad the casting is. It's an easy fix in post but I'd rather get it right in camera. I've experimented with profile hues and WB shifts but it just seems to muddy things up when making extreme compensations.

I have a grey card on the way that I'll try setting WB with, perhaps that will give me more accurate colors than the piece of paper. Any other suggestions or feedback for me would be much appreciated. Am I missing something here?
 
Odd. The GH4 is known for a more orange cast, especially in the skin tones. The only time I have issues with green tint is when using IRND filters, because they filter a tiny bit of visible red light. White balancing with a white card should be fine. I actually think the GH4 white balance is more accurate with a white card versus a grey one, in my tests anyway. Are you sure the issue isn't with the monitor you are viewing on? Instead of white balancing, try the manual kelvin settings to see if the green is still there.
 
Thanks for the response. I agree, it's really bizarre. I'm certain it isn't a monitor issue. I've viewed the footage on 3 or 4 different displays and it looks more or less the same on all of them. I'll give setting via kelvin a try this evening to see how that affects it.
 
Could you be specific with your colour profile and settings etc? As Batutta notes, the GH4 tends towards orange more but this can be fixed with a corrective LUT such as my Leeming LUT One for Cine-D.

Try these settings (PDF) and see what colour cast you end up with on skin.

Also, a white sheet of paper gives a blueish tinge as it's usually got brightening chemicals in it to make it pop more to our eyes. A proper, spectrally neutral grey or white card is a much better option, or white balance off bitumen on the road or something equally neutral.

HTH!

Paul :)
 
visceralpsyche said:
Could you be specific with your colour profile and settings etc? As Batutta notes, the GH4 tends towards orange more but this can be fixed with a corrective LUT such as my Leeming LUT One for Cine-D.
Click to expand...

Thanks Paul. I shot using Cine-D yesterday and my settings used were 0,-2,-5,-5,+2. All other camera settings (minus zebra levels) were set to your recommendations in the PDF you gave me. I also ETTR whenever I can.

That's good insight regarding the paper and potential color issues the chemicals may cause. I'll make your recommended tweaks to the profile and set WB using my new grey card this evening.

video652 said:
Could it be the lens?
Click to expand...

I don't think so. I've had the issue on every lens I've shot with (FD Primes, EF Primes/Zooms, Panasonic glass as well).
 
Try opening your camera footage in the free version of DaVinci Resolve. I've found that different NLEs can interpret color differently. ( i.e. Vegas Pro has different color than Resolve when opening the SAME camera files )
 
You must log in or register to reply here.
Back
Top