A7s Jagged Lines

S

svenzn

Member
I came across an issue I haven't noticed before the other day, jagged lines. I'm including an example of a project I'm working on, you can see the issue between 00:32-00:37 and 02:07-02:24. In the first part it appears on the metal stripe on the bottom of the TV, as well as the golden line on the wooden radio. In the second example it appears in the dark lines between the kitchen drawers. The video is shot in 4K through the Shogun in HQ. Picture Profile in camera was Cinema 4, Pro, Detail -2. After noticing I tried different profiles in the camera and went through different levels of detail but they all showed it to some degree. I also tried changing to a different lens but the issue was still there. And thoughts, ideas, or is it simply common knowledge that this happens?

https://www.youtube.com/watch?v=CsK7vtSFuvk&feature=youtu.be
 
It's common knowledge that it happens in nearly-horizontal edges of contrasty highlights.

Not sure if anything else may be at play here (you are downsampling from 4K to 1080p, and the method for doing so can introduce this kind of artifacts).
 
Thanks Samuel, did not know that :)

I'll set detail to -7 to try and minimize it.

The clip however isn't downsampled, it's rendered in 4K and uploaded like that, and availeable to play as such on youtube. However I did some tests and noticed it in the Shogun monitor straight from camera when trying different settings as well.

Thanks for the quick replies guys :)
 
Well, if you upload it at 4K and I watch it at 1080p, it's downsampled, with whichever method YouTube uses for that.
If you see the issue in the original 4K material too, it's not YouTube's fault.
 
Youtube downsamples very fast and it creates these aliased lines (that's why 4k at 1080p monitor still looks "sharpish" as the aliasing creates false sharpness).

Check the original material, preferably zooming into the lines.

Though the a7s does have problems with white contrasty edges (it makes horrible black artifacts right next to them) atleast when shooting 1080p.
 
I feel like that's just standard display aliasing. Not necessarily the camera or codec's fault, I see that all the time on digital displays, sometimes even on Hollywood produced films I'm watching at home. I wouldn't let it bother me too much, but you can try the recommendations above.
 
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