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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

4k 3:1 vs 6:1

Make sure to do some torture tests. Often, under ideal conditions compression ratios aren't dramatic in their differences. Try things like high contrast, lots of trees with camera moving, shots with insane amount of detail, greenscreen/VFX, etc.

For just about everything else I think 5:1 is pretty darn good and a lot of the big features are shooting at that ratio.
 
Chris McKechnie said:
I've read/heard that most features are shoot at 7:1/8:1. However, unless you're projecting 4k, you won't notice a difference between 5:1 and 3:1 so conserve your HD space. :-)
Click to expand...
Last one I worked on we shot with 3 Epics at 5K, 5:1.
 
5:1 is also what I hear from most users in LA. Ironically, this also corresponds to the compression rate used in Sony's HDCam and older Digital Betacam spec. Maybe 5:1 is the tipping point between "just enough bits" and "not enough bits".
 
If you want a good test, get your sharpest wide lens out, use it at it's best aperture and shoot lots of detail with high contrast. Or you won't see much of a difference.

Any R1 veteran around who remembers the "tree of death" ?
 
Pretty much everything I have worked on or know anybody has worked on shoots between 5:1 and 8:1 for the project.

I'm more or less curious about "when" you see the difference when pushing thing around between those levels. There's certainly subtle details lost, but it's real hard to see between those compression ratios.
 
Kemalettin Sert said:
http://s3.amazonaws.com/Kemalettin/test1.zip
http://s3.amazonaws.com/Kemalettin/test2.zip

you should see difference in motion... 3:1- 6:1- 9:1- 12:1- 15:1- 18:1
shot on 35mm RPP
Click to expand...

Thanks for the test shots. Downloading second one now.

Thoughts on test1:
Viewing at 100% and looking at the shadows in the windows and under the eave. I set to iso12800, contrast all the way up and shadows at -1. Grain size grows from 3:1<6:1<9:1 and then gets very digital and mushy suddenly @ 12:1. Very interesting.
 
Tehben look for the motion,artifacts and noise becomes more visible on higher compression..first just wanted to share tiff. files from test but i see difference noticable only at motion they looks same on stills
 
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