GH2 Picture Profiles Highlight Clipping Test

Ben_B

Veteran
My Christmas gift to you all: Here is a somewhat rough test of several of the GH2's picture profiles when it comes to highlight clipping on a scene with some overexposed areas. Looks like Cinema is the winner for highlights, and, informally, nostalgic is the winner for shadows. I am going to pick cinema to shoot with as I think it will have the nicest looking skies, etc, and I don't like bringing up shadows too much because I think that's how you get the worst grain and artifacting. On GH1 nostalgic had the worst banding in low-light. (http://www.dvxuser.com/V6/showthread.php?222669-Banding-band-aid-(semi-solution))

According to Barry Green's tests, the highlight warning on the GH2 is at 100 IRE, meaning you lose all detail in that area...meaning that if you see an area on one setting in white that is black on another it is not losing detail while the other setting is.

All settings were done with Contrast: -2, Sharpness: +1, Saturation: +/- 0, and NR -2. These are the settings I have typically used so I used them for this because this was originally a test for me, I just thought I'd share the results.

Exposure and focus were locked on GH2, real-time highlight warning was on, camera was in video mode not recording, and outputting via HDMI to Ikan monitor. Photo was taken by GH1 with 14-140mm lens. Both cameras and monitor were resting on a countertop to avoid movement between shots. I tried to avoid jostling GH2 while changing film mode settings, and preset all the film modes so I just had to toggle between them.

You can see, although I recommend downloading the photos and toggling between them to most clearly see it, that Nostalgic and Standard are very similar, with Standard clipping slightly less (better), and that Smooth and Dynamic are similar, with Dynamic clipping slightly less (better.) Cinema is in a class on its own.

I can do more tests like this with more settings if people want.

Cinema:
cinemab.jpg


Nostalgic:
nostalgic.jpg


Dynamic (known to be high contrasty but oddly seems to have beaten the popular Smooth in the highlights):
dynamic.jpg


Smooth:
smoothq.jpg


Standard:
standardu.jpg


Hope this helps! After seeing this what are you guys picking. I realize this isn't a great dynamic range test as it doesn't show much of the darks, although you can clearly see nostalgic has the brightest shadows...though I was starting to see some ugly noise there (though I think it would improve had I hit record) but again, I prefer rolled back highlights to pumped up darks...that histogram scares the crap out of me because there must be false detail there...there is just no way it can bring shadows up like that without killing quality.
 
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I applaud the test because unfortunately dynamic range seems to be very low in eyes of most compared to low light etc!!! Started to get fed-up with the 10 test at 3200 iso etc... But I can' t see how the way you conducted this test can help at first yourself and then us in the way you conducted it. Would it not have been much better had you recorder 5 second clip of each mode and then either hosted the mts somewhere or more easier do screen grab and host it somewhere. Judging just using a down-scaled monitor will induce a lot of variables that makes it near impossible to judge. When I see your last paragraph you yourself are completely unsure of your conclusion, should you have push that record button and watch the result on a proper monitor believe me it would have made a big difference.
 
I applaud the test because unfortunately dynamic range seems to be very low in eyes of most compared to low light etc!!! Started to get fed-up with the 10 test at 3200 iso etc... But I can' t see how the way you conducted this test can help at first yourself and then us in the way you conducted it. Would it not have been much better had you recorder 5 second clip of each mode and then either hosted the mts somewhere or more easier do screen grab and host it somewhere. Judging just using a down-scaled monitor will induce a lot of variables that makes it near impossible to judge. When I see your last paragraph you yourself are completely unsure of your conclusion, should you have push that record button and watch the result on a proper monitor believe me it would have made a big difference.

I'm simply comparing highlight rolloff, not overall dynamic range. I simply wanted to quickly and easily determine what the best profile for avoiding clipped highlights is, and this clearly shows it's cinema.
 
Merry Christmas, Ben. Thanks for doing this - very helpful. Think I'm going with Cinema, initially. Had been using Smooth on the GH13. It will be interesting to see what modes and settings people start choosing as favorites.

Although I haven't had much time to play with it, I'm liking the GH2 a LOT so far. The switching of the dial from front to rear, the move of the Motion picture button, and the Focus mode lever/Auto focus mode dial combo are going to take some getting used to. But I'm sure it will become second nature in no time. Overall, I'm liking the many changes and additions they've made. One of my definite favorites is the flashing highlights during monitoring and recording. I always liked to shoot a bit overexposed with the GH13, and so was constantly thinking how nice zebras would be. This definitely helps - especially knowing the flashing indicates 100 IRE (thanks Barry).

Merry Christmas and Happy Holidays to all.
 
Thanks for doing this test Ben and repeating Barry's test of the flashing being 100 IRE. I didn't see his post on that one. In my brief toying around with the GH2 this evening after it arrived I found that so far I preferred the look of Cinema the most overall just looking at the LCD. I haven't shot anything and imported it into my computer yet to get a better look at everything, but will try to do some of that tomorrow.
 
To my eyes, "Cinema" looks darker all over the place, in the shadows as much as in the highlights.

Could it be that it received a bit less light than e.g. "Smooth", or what may be the reason for this result?

And wouldn't "Smooth" hold the highlights just as well if you reduced exposure, to match the level of brightness that "Cinema" shows in the midtones and the shadows?
 
If they're brighter it's because the others are bringing up the image levels not because Cinema is reducing them. You should shoot cinema and then expose brighter for clean footage.
 
I don't have a GH2, but when I read that the GH1 also had the highlight feature (albeit not in realtime), I decided to do a test myself. I set the camera on a tripod and locked all the exposure/iso/aperture/shutter settings. I went through 4 different film modes recording a few seconds of each. Then I went into preview mode to see the clipping areas and took a picture of each mode with a pocket Samsung camera. Here are the results.

Standard
standard.jpg



Vibrant
vibrant.jpg



Smooth
smooth.jpg



Nostalgic
nostalgic.jpg



Smooth and nostalgic clip far more than standard or even vibrant does. I double checked to make sure that all the settings were the same. The exposure meter at the bottom was the same for each shot. It seems that the other modes have brighter colors making them clip faster at the same exposure. I'm going to do some more tests where I underexpose in smooth to try and match the clipping of standard mode.
 
thanks for sharing this Ben,

comparing this with the nostalgic setting of Emmanuel here, http://vimeo.com/18155086 it explains the "almost" lack of detail in the bright high key outdoor shots, BUT, I felt it gave the best "latitude" and DR when we tried to grade his video since he mentioned they are ungraded. The detail in the sky was there though, just barely, I think for aggressive grading work, nostalgic provides a flatter palette but based on your tests we just have to be wary and perhaps slightly underexpose?

Again, good tests, I'm continuously looking out for this camera, :-) my 7D is getting nervous.
 
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