You Don’t Have to Shoot Log all the Time. Right?

October 27, 20152 Comments

Jason Coffee

This looks flatter than it is. I got a sun flare that I didn’t notice. DOH! Fix it post.

Lately I’ve been asking myself why do I always shoot in log mode? Yes more dynamic range is nice but in low contrast situations is it really necessary? So I decided to go for a more baked in look with the original Sony a7s for situations that don’t need to be so flat and makes post work longer. Don’t get me wrong. I enjoy color grading a lot but if I can get a nice image without shooting LOG this might be beneficial. The a7s with Slog has a green cast to it that requires even more work in post.

Kodesh Coffee

Very little grading here. Color was good from a solid white balance.

I wrote about a new profile I liked using that is accurate for color but not so flat and here is the results of this look in a promo I just finished shooting and editing with the original Sony a7s. The first anchor in the video was shot with the new A7s II in 4K with a diffrent profile I’m working on. More on that soon but on the a7s II I like CINE 3 and the Still color profile. Yep “still”. It’s the most accurate profile for color I found so far.

The image was easy to grade. The blacks are lifted a little so that gave me the option to see in the shadows more or darken them up. CINE Gammas are very good for this. CINE 1 is flatter than CINE 3. They kind of get more contrasty as you go up to CINE 4.

Here is the breakdown of the Gamma settings for the Sony a7s II. It has a few new ones.

Gamma

Movie Standard gamma curve for video
Still Standard gamma curve for still images
Cine1 Softens the contrast in darker image areas and emphasizes gradation changes in lighter image areas, producing a subdued tone overall (equivalent to HG4609G33)Gamma curve that obtains a dynamic range of 460% when the exposure is adjusted to 33% video output with 18% reflectance gray. The maximum value of video output is 109%.Images shot with this gamma can be used without grading, but since the images have smooth gradation characteristics, this can be used to grade and finalize the viewed image in the post-production process.
Cine2 Similar results to [Cine1] but optimized for editing with up to 100% video signal (equivalent to HG4600G30)Gamma curve that obtains a dynamic range of 460% when the exposure is adjusted to 30% video output with 18% reflectance gray. The maximum value of video output is 100%.
Cine3 Stronger contrast between dark and light image areas and greater emphasis on black gradation changes (compared to [Cine1] and [Cine2])
Cine4 Stronger contrast than [Cine3] in darker image areas
ITU709 ITU709 gamma curve (low-light gain of 4.5)
ITU709 (800%) Gamma curve for checking scenes recorded using [S-Log2] or [S-Log3]
S-Log2 [S-Log2] gamma curve. This setting is selected when some grading work will be performed after recording.The exposure is set so that 18% reflectance gray video is output as 32%. Under these conditions, a dynamic range of 1,300% is obtained with 90% reflectance white.
S-Log3 [S-Log3] gamma curve with characteristics closer to those of film. This setting is selected when some grading work will be performed after recording.It allows for better reproduction of gradations in shadows and the mid-tone range than S-Log2.The exposure is set so that 18% reflectance gray video is output as 41%. Under these conditions, a dynamic range of 1,300% is obtained with 90% reflectance white.

  • As a characteristics of S-Log3, the dynamic range can be extended above 1,300%. However, Picture Profile is set to a dynamic range of 1,300% in order to maintain a balance with camera performance. Under these conditions, the maximum value of video output is 94%.
As you can Sony recommends certain Color Profiles with Gammas, but I found that not all Color Profiles are accurate and to get started right I want the most accurate one to use with the Gamma I want. For the a7s it is ITU709. I use a DSC Lab color chart and the Vectorscope in the Convergent Design Odyssey 7Q+. This is a very good way to see exactly what is going on wit the primary colors

Color Mode

Movie Color tones for [Movie] gamma curve (standard color reproduction for movies when Picture Profile is not used)
Still Color tones for [Still] gamma curve (standard color reproduction for still images when Picture Profile is not used)
Cinema Color tones for [Cine1] and [Cine2] gamma curve
Pro Color tones similar to standard Sony broadcast camera image quality (used in combination with [ITU709] gamma curve)
ITU709 Matrix ITU709 color tones (used in combination with [ITU709] gamma curve)
Black & White Sets the saturation to 0 for recording in black and white
S-Gamut Setting based on the assumption that some grading work will be performed after recording. Used when [Gamma] is set to [S-Log2].
S-Gamut3.Cine Setting based on the assumption that some grading work will be performed after recording. Used when [Gamma] is set to [S-Log3].

  • This setting is easier to use than [S-Gamut3], because it limits the color space to a more practical range than that of [S-Gamut3]. It is recommended in cases where [S-Gamut3], a wide color space, is not required.
S-Gammut3 Setting based on the assumption that some grading work will be performed after recording. Used when [Gamma] is set to [S-Log3].

  • This setting has a wider color space than that of [S-Gamut3.Cine]. It is suited for converting images to a format with a wide color space like BT.2020.
  • Depending on the type of camera, the entire [S-Gamut3] color space may not be supported.

Making things simple has other advantages other than post. I can see the image in my monitor without using a LUT making it easier to focus and just getting a better feel if what I’m actually shooting is color accurate. Most issues with color happen with a bad white balance so I recommend nailing it from the get go. Shoot a chart like the X-Rite ColorChecker Passport as a safety. These come in handy big time.

Another thing about shooting LOG that can be problematic is the 8bit 4:2:0 thingy. Slog is very flat. You have to either use a LUT or grade from scratch and you need to know how or it will take forever. LUTS are great but use the wrong one and again. Trouble and time lose. Every time you move saturation up or change color balance you are degrading the image and adding noise. Yep and that 8bit 4:2:0 codec can only take so much until it breaks. It might look good now but when you go to compress it for the web the image could and probably will break and noise and banding are now apart of the video. Ugh! Capturing the color balance and exposure right from the start will help. Leaving some room for editing or grading is a great idea. Don’t crush the blacks because if you do then you cant get them back. Lift the shadows to much and it get noisy. Leave some room and you can decide to bring the shadows down without making it really hard to balance.

So next time ask yourself. Do I need to shoot this in LOG? Maybe the answer is no and in a lot of cases the difference wont be noticed in the finale edit and you just saved yourself a lot of work in post.

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About the Author ()

I'm a broadcast DP In San Diego. I enjoy sharing what I'm working on and testing new equipment. This blog is also part of giving back. I've learned so much from so many people.

Comments (2)

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  1. Ken Jones says:

    I shoot with a Nikon D800 (and sometimes a Canon 5D mkIII) and gave up trying to shoot with a “flat” picture. I decided to spend an entire Saturday in the studio shooting with different settings and then going into the edit suite to find an optimal setting. I just bake the look into the file now.

  2. I want to thank you for wiring this. I’m NEW to Sony and getting accustomed to the a6300 which I purchased strategically for video. I REALLY like it so far. Posts like this one are giving me the tools and information I need to get up to speed in my workspace and intentions for this camera. I too like grading although I’m not great at it.. but it feels GREAT to have that flexibility in post-production. I’ve yet to find my favorite color profiles according to my shooting/editing style, but you’ve gotten me a couple steps closer.

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