GH2 Aliasing normal?

J

J-Rey

Member
Hello. I have had a GH2 for a little while, but haven't used it on too many occasions for video, which is the reason I bought it. I recently did some tests with ND filters and noticed that there is some aliasing going on, which I thought the GH2 was supposed to not have. Maybe it is just less pronounced than other DSLRs? If this is normal I can live with it, but if it's not I'd really like to figure out what the problem is. I'm using Adobe Media Encoder CS5 to convert to prores4444.

It's most noticeable at the center of the focus card:

Here is the same clip as an h264 .mov (clearer):
http://www.fullresolutiondesign.com/misc/hitech_comparison_h264.mov
 
The GH2 definitely has substantial aliasing. But what it doesn't have, is the colored rainbow aliasing like the Canons have. The GH2's aliasing is strictly in luminance (black/white). That makes it far less noticeable, and much less objectionable.
 
Well it's not the codec. Prores4444 is more than good enough for our RED footage, so that's not the concern. I was just wondering if Adobe Media Encoder did something to it, but if aliasing is normal then that's not it.
 
J-Rey said:
Well it's not the codec. Prores4444 is more than good enough for our RED footage, so that's not the concern. I was just wondering if Adobe Media Encoder did something to it, but if aliasing is normal then that's not it.
Click to expand...

What codec are you shooting with the GH2? Anything other than AVCHD HBR and you may not be happy with the result no matter what codec you transcode to.
 
This amount of aliasing is looks more than "normal" to me. I'm wondering if you've inavertently deinterlaced it in Adobe. Some versions of premiere interpreted the footage incorrectly at interlaced.

What does the original footage look like in another program like VLC or Mplayer (you're probably on a mac, so Mplayer OSX Extended)? Or upload a sample of the original unprocessed clip
 
GH2 does have aliasing. I've noticed some here and there depending on the shot over the last year. But wow...compared to the 7D and T3i...whew. So much better than Canon. I was likely in the chorus claiming there was no aliasing in the GH2 because I was so used to seeing it all over the place in the Canons. The GH2 seemed so clean in comparison.
 
Asi have said many times some GH2s mine included have bad aliasing unless filming with carefuly on a tripod ,the XA10 i have started using proves this much cleaner footage,and i am talking about what is on the GH clips nothing to do with it being deinterlaced,25/24 and to a lesser extent 50i have aliasing on mine.
 
dan.carter said:
What codec are you shooting with the GH2? Anything other than AVCHD HBR and you may not be happy with the result no matter what codec you transcode to.
Click to expand...

I would assume that's what I'm shooting with. I shoot 24H Cinema mode. I'm using Flowmotion 2.02

PDR said:
This amount of aliasing is looks more than "normal" to me. I'm wondering if you've inavertently deinterlaced it in Adobe. Some versions of premiere interpreted the footage incorrectly at interlaced.

What does the original footage look like in another program like VLC or Mplayer (you're probably on a mac, so Mplayer OSX Extended)? Or upload a sample of the original unprocessed clip
Click to expand...


I looked at the MTS files in VLC and it looks the same.
 
You will always find some aliasing with test charts, but it's a lot harder to find aliasing in real world situations. I see it occasionally with my GH2 footage ( and even more with my GH3 shots ), but it's pretty hard to spot most of the time.

You would have to move up to the Panasonic AF-100 camera, Sony FS100 camera, or or Canon C100 camera to see less aliasing in your shots. All of these cameras are in a much higher price range.
 
TheDingo said:
You will always find some aliasing with test charts, but it's a lot harder to find aliasing in real world situations. I see it occasionally with my GH2 footage ( and even more with my GH3 shots ), but it's pretty hard to spot most of the time.

You would have to move up to the Panasonic AF-100 camera, Sony FS100 camera, or or Canon C100 camera to see less aliasing in your shots. All of these cameras are in a much higher price range.
Click to expand...

Thanks for the info. This works fine for what I bought it for: personal projects. My company has a RED that I can use if I ever need to step up, it's just so friggin bulky and really needs an AC with it.
 
I too noticed a lot of the aliasing on my gh2. I've only had it for a few months and shot an interview with it where the face and shirt of the person contrasted a lot with the dark background, and you could see a lot of that aliasing. Kind of annoyed me but seems like others noticed it on theirs too. Bought mine with that Amazon deal for $500, so can't complain.
 
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