C100: C-Log and grading, what i did wrong (lights)?

M

michasacuer

Active member
Last week i shoot my first wedding with Canon C100. I like iso performance on c-log and i get with it great results, so i decide to record my footeg with that CP.

Just look on light area

http://www59.zippyshare.com/v/tOU2x1se/file.html

Both clips are render in Edius 7 with basic grading. "LED 1" is graded, "LED 2" is render by program without grading.

What i did wrong? Or c-log cant handle light like that? Maybe i exposure wrong?

Thanks for help.

Best Regards.

Michał.

Ps: Settings ; f2.8 / ISO 6400 / 1/50, recorded in "50i" with Canon 17-55.
 
You might have overexposed a bit, but this is about the most challenging lighting situation you'll find. The F5 is a lot worse under mixed light in my experience. Blown out mixed lighting. The Alexa and Dragon seem to handle this a bit better, especially the Alexa.

The highlights look really saturated with some channel clipping. Best you can do is to try clamping the saturation in the lum vs sat curve (assuming you're grading in Resolve) or the sat vs sat curve. The Film Convert plug ins also do a decent job mitigating this. But the blue channels are bad here, uncharacteristically so for Canon.

Sony has a custom SLOG3 curve that's designed to fix this problem, which is worse in SLOG2 than in Canon Log fwiw:

http://www.dvinfo.net/article/acquisition/sonyxdcam/sony_sgamut_vs_sgamut3.html#prettyPhoto

But I don't know of any custom Canon looks to tackle it. In my experience WideDR and Canon Log are pretty good!

Fwiw your footage doesn't look that bad at all. Highlight channel clipping is worse on a lot of high end content. Unless your client complains it's passable. At worst cut around it. You might get far with the lum vs sat curve, though!
 
Sorry. Too many download buttons of advertisements in that link. Using dropbox or a link via wetransfer.com is much better. Atleast one can be assured that unwanted stuff doesn't get downloaded to the comp.
 
The Canon dSLRS are surprisingly good under mixed light and bad light. They have a lot of bad specs and a soft image but they do have good colors and highlight rolloff.

It might be possible to create a look file that clamps saturation around 30 or 40 IRE and reduces it to something approaching zero as you reach 100+ IRE. I don't know how to, but that would be what you'd want to do, and what Arri has done and Sony did in the modified SLOG3 setting referenced above.

Resolve is really easy to use so I wouldn't sweat it. It's free, too. But the best solution might be avoiding lights like that. They don't look worse than traffic lights in Blacklist or other F55 or F5-aquired content. It's not that bad! Better than most cameras. And it will look better on a video monitor than on a computer, too. I doubt your client will be as hard on you as you are. :)
 
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