I'm I Grading S-log2 Somewhat the Right Way?

Discussion in 'Cameras' started by Dave Dugdale, Jul 17, 2014.

  1. Dave Dugdale

    Message Count:
    92
    Location:
    Colorado
  2. paul provost

    Message Count:
    826
    Location:
    Los Angeles
    8 bit log is satan's work. Has been ever since the original "cinestyle" on canon 5d.
  3. Marc Wielage

    Message Count:
    1,587
    I should make a T-shirt that says, We Need More Bits, Not More K.
  4. Marc R Leonard

    Message Count:
    302
    Location:
    Albuquerque
    I would buy that...
    ... I'm going to ask someone to design this... Or I will :)
  5. Jay Mead

    Message Count:
    20
    Location:
    Boulder, Colorado
    FWIW that's about what I would have done, I have been doing a lot of work with cinestyle'd 5d's as well and getting the skin tones right is hard work. The Hue vs Sat curve in Resolve has been a great help for me at least, but hey I'm not even an amateur yet.

    Respect for a fellow Coloradoan. :)
  6. Dave Dugdale

    Message Count:
    92
    Location:
    Colorado
    I have given up on s-log2 on the a7s. It so hard to make it work.
  7. paul provost

    Message Count:
    826
    Location:
    Los Angeles
    It just seems like a stupid idea from the start. You can't stretch it back into video range without it breaking up. And it's been around for years now. Maybe ok if you want to stay with the lo con look. 8bit you got to expose ideally.
    hillary knox likes this.
  8. hillary knox

    Message Count:
    325
    Location:
    New York, NY
    There should be an entire website devoted to that last sentence.

    8bityougottoexposeideally.com
  9. Dave Dugdale

    Message Count:
    92
    Location:
    Colorado
    The more I learn about it the more I think you guys are right.

    However that being said, I have gotten better shots with slog2 than the normal profiles in lower light situations like this one below, I am not sure why.

    [IMG]
  10. Steve Shaw

    Message Count:
    625
    This why the EOS Gamma Curves we developed include a LOG curve that is based on the Cineon profile, but very importantly, the profile is NOT an exact clone of the Cineon LOG profile as this compresses the dynamic range of the captured scene into a smaller range of image data than is available with the 8 bit signal, further compromising the image quality.

    See: http://www.lightillusion.com/canon_curves.html

    With this approach you do get the best possible results from the 8 bit signal chain, and this curve has been used with a lot of success on a large number of projects, from film to Yv commercials, and more.

    See: http://provideocoalition.com/aadams/story/canon_5d_shoots_kids_for_t-mobile/

    Steve
  11. Samuel Hurtado

    Message Count:
    3
    I had a go at grading this clip. Once again I made a point of not spending too much time with the clip: I allowed myself 5 minutes and followed my usual workflow for 5N footage: curves+levels, then WB+MB_Mojo.Then I added 200% saturation, which is never ideal: I would have shot with much more saturation in-camera, adding it in post is just asking for image issues to pop up, bringing it down is a lot easier.
    [IMG]
  12. David Andrade

    Message Count:
    77
    A bunch of us in a Facebook group were just having the same conversation about 8 bit footage. The way I left it was 8 bit footage is 8 bit footage is 8 bit footage unfortunately. You can twist and turn the contrast of it, but as someone else mentioned here, that actually just causes more issues than it helps really. Another gentlemen was doing similar tests with his GH4 and the "Cine" picture styles and eventually came to the conclusion it was better to just get in right in camera, which is exactly what others have said here. I 100% agree with Marc here. I would LOVE for camera manufacturers to come out with a moderately priced camera with 10bit 4:2:2 uncompressed clean HDMI out, than have a 4k camera (if I had to choose). Don't get me wrong, shooting neutral compared to standard on most cameras (DSLR) is ideal, but "flat" should probably be reserved to cameras who's footage isn't already so compressed.
  13. Dave Dugdale

    Message Count:
    92
    Location:
    Colorado
    I can't see your image, can you repost it?
  14. David Andrade

    Message Count:
    77
    Dave,

    This is what I was able to come up with. It wasn't too difficult to get to this point and the footage actually didn't break up too bad. What I did was head into SpeedGrade, balanced the image in the highlights, shadows, and midtones individually. For some reason that gave her skin tones a slight magenta overcast so I pulled that back a little bit in secondaries. I then added some saturation (I didn't actually even have to add too much, just to give it some punch.) Also added some midtone contrast. The thing I didnt expect was how overly saturated those yellow lights were! I had to go in and do a secondary on those and pull that back a little.

    The only other thing I would do (if I had more time) was adjust the sky so that it was at 100 IRE because looking at the footage and the scopes it appears to be clipped, and I noticed that unless your roll of the saturation, or give it a nice highlight rolloff, it just turns to this weird milky color instead of pure white.

    Anyway, once I had the footage balanced, the rest of it was just little fine tuning. Forgive my low-ish quality jpeg screenshot :) I think your technique was fine. I just think you might have went a little too warm.


    COLOR.JPG
  15. Dave Dugdale

    Message Count:
    92
    Location:
    Colorado
    Thanks David for sharing your grade and what you did with it, I am learning with everyone's comments here.
  16. Marc Wielage

    Message Count:
    1,587
  17. Robert Houllahan

    Message Count:
    497
    Just picked up an A7s

  18. Robert Houllahan

    Message Count:
    497
    I am not 100% happy with the tone on his fur, I graded this in Resolve with NO LUT and some hue vs sat curves and contrast, etc.
  19. Robert Houllahan

    Message Count:
    497
    Low light slow motion

  20. Robert Houllahan

    Message Count:
    497
    Very very low light....

Share This Page