Australian feature film cinematographer/director Paul Leeming has released the first camera profile correction look-up table in his Leeming LUT Pro set for Fujifilm X-Trans sensor-equipped cameras, for Fujifilm’s F-Log logarithmic shooting profile, with Eterna Cinema, Pro Neg Std and HLG for Rec709 LUTs to come.
This is a significant and long-awaited event given that Fujifilm has finally delivered on its longtime promise to radically improve its cameras’ video capabilities with the Fujifilm X-T3 and X-H1, with the coming X-H2 hopefully improving on the X-T3 as a moviemaking hybrid mirrorless camera in Super 35 format.
Super 35 has long been the feature film format of choice for narrative and documentary production, and the arrival of improved video capabilities on Fujifilm’s X-T2 cameras was a relief after the disappointment of the X-Pro2’s video support.
Leeming LUT Pro for F-Log on Fujifilm cameras with X-Trans sensors
Even the recently announced X-Pro3 appears to have 4K Super 35 video features that may prove good enough in a pinch when more video-oriented cameras are unavailable.
The Leeming LUT Pro expose and correction methodology is based on exposing to the right aka ETTR followed by correction via camera-specific look-up-table files in one’s nonlinear editing suite or colour grading software of choice.
The ETTR method’s most vocal proponent was the late Michael Reichmann who was in favour for its use in photography and videography, and although he and many other photographers constantly lobbied camera makers for auto-ETTR in their Live View-capable cameras, to no effect so far.
Why camera makers continue to ignore the necessity of optimal exposure is anyone’s guess.
For that reason I am grateful that Paul Leeming has applied himself to solving the problem of correct exposure followed by correcting colour via Leeming LUT Pro, with the added benefit of making footage shot on a variety of affordable cameras usable in the same timeline without excessive shot matching work.
The ideal, maximum possible dynamic range and realistic colours, using Leeming LUT Pro and Expose-To-The-Right (ETTR)
Uncorrected camera maker luma and colorimetry
Luma curve and colorimetry levels corrected with Leeming LUT Pro
In the light of camera makers’ tendency to fudge their camera’s video output as illustrated above, exposing to the right appears to make footage appear darker than one may be accustomed to, but Mr Leeming has made available other, secondary, LUTs to quickly and easily raise footage low values, as explained below.
As usual, the LUT will “darken” the footage, which really just means it will make the curve perfectly LINEAR. Examine the attached image using your waveform scope in your favourite editing software, and you’ll see what that means, with the exposure steps forming a perfect “X” shape in linear fashion. This is of course ETTR, so if you under-expose your image, it will look darker.
The LUT(s) don’t make the image darker. The LUT(s) correct the manufacturer luma curves to be linear. In most (but not all) cases, this results in the image “appearing” to be darker, but it’s not affecting anything, nor clipping anything, nor adding additional noise that wasn’t in the shot to begin with.
Don’t forget, you also have the Apollo Pro Quickies to use after the corrective LUT in case you want to brighten the image without clipping the highlights or adding any more shot noise. But when you can, please ETTR and save yourself the problems (and give yourself the cleanest possible log image to begin with).
If your shot after LUT application has its highlights not reaching 100% IRE, then you underexposed it. Use the zebras as per the guide to see where the clipping point is. Expose just shy of that and you’ll maximise sensor dynamic range and minimise shot noise.
If you HAVE underexposed or simply want a brighter image post-corrective LUT, try following it with one or more of my Apollo Pro Quickies, which are expressly designed to lift the shadows in a natural way without clipping the highlights.
Stills frames from feature film shot by Paul Leeming, ungraded then graded with Leeming LUT Pro
Settings for shooting video Fujifilm cameras for processing with Leeming LUT Pro
- Pro Neg Std, Eterna Cinema, F-log or HLG
- H265 recording format
- DR100 for all profiles
- Highlight tone 0
- Shadow tone 0
- Color 0
- Sharpness -4
- Noise Reduction -4
- Zebra level 100%
Quick and dirty Leeming LUT Pro for Fujifilm F-Log tryout with Fujifilm X-H1 F-Log footage
I shoot documentary stills and video rather than make narrative feature movies, so often work alone under challenging conditions as in this example.
The Fujifilm X-H1 had a vintage Zeiss Jena Pentacon 50mm f/1.8 MC Auto prime lens attached to it via a Gobe M42-to-X-mount adapter with no neutral density filter, and I fudged on setting a custom white balance as I was more concerned with understanding the creative possibilities of this lens for video than in getting technicalities perfect.
An adapted 50mm lens on an APS-C/Super 35 camera equates to 75mm in the 35mm sensor format, which is one of my favourite focal lengths for documentary photography and video.
I have been throughly enjoying trying out this lens and its companion, a Panagor PMC 28mm f/2.8 wide-angle prime lens that Paul Leeming kindly gave us.
These sorts of vintage prime lenses are rare and overpriced here in Sydney, at least ever since camera stores like Foto Reisel with their secondhand gear cabinets closed down.
Fujifilm Super 35/APS-C hybrid cameras capable of shooting 4K and Cinema 4K F-Log video as well as in other picture profiles: X-T3, X-H1 and X-Pro3
- Gerald Undone – Best LUT for Beginners – Leeming vs FilmConvert vs Buttery – “Comparing some quick color grades using the Leeming LUTs, the Buttery LUTs, & FilmConvert with some general color correction tips and usage scenarios.” – video
- Jon Pais – Getting Good Colors Using ETTR, X-Rite Colorchecker & Leeming LUT Pro – “I made this video in response to a viewer’s question about ETTR.” – video
- Jon Pais – How to Expose to the Right – “How to expose to the right using the X-Rite Colorchecker and false color.” – video
- Jon Pais – Leeming LUT Pro and Leeming LUT Quickies – “Leeming LUT Pro and Leeming LUT Quickies” – video
- Jon Pais – Leeming LUT Pro Sample Footage – “A quick demo of applying Leeming LUT Pro to Sony Cine2 footage.” – video
- Jon Pais – Response to Viewer – “I believe a viewer didn’t like the flat lighting in my last video, so I’m uploading one with a little more punch.” – video
- Leeming LUT Pro – website
- Paul Leeming – How to ETTR – Quick And Dirty Edition! – “How to Expose To The Right (ETTR) to maximise your camera’s sensor dynamic range :)” – video
- The Luminous Landscape – Expose Right – This once-essential website is now paywalled, though a limited number of free page views is permitted before paying for access.
- The Luminous Landscape – Optimizing Exposure – “In 2003 I wrote a tutorial titled Expose Right. To my knowledge this was the first generally available essay that discussed the realities of digital exposure, as opposed to that required for film. Since then the technique described has become known as ETTR (Expose To The Right)…. A live-view histogram-based auto-exposure system is all that needed to generate the best possible exposure from a technical perspective.”
- Wayback Machine – Expose (to the) Right: Maximizing S/N Ratio in Digital Photography
- Wayback Machine – Optimizing Exposure: Why Do Camera Makers Give Us 19th Century Exposures With Our 21st Century Cameras? – “In digital photography, exposing to the right (ETTR) is the technique of adjusting the exposure of an image as high as possible at base ISO (without causing unwanted saturation) to collect the maximum amount. So – here we are, more than a decade into the DSLR revolution (and the new century) and camera makers are still using 25, 50, even 100+ year old exposure technology in our latest cameras. Why? I really can’t say, but they should be taken to task for not delivering the best image quality that their cameras are capable of and thus get the optimum performance out of the digital image sensor.”
- Wikipedia – Colorimetry
- Wikipedia – Exposing to the right
- Wikipedia – Gamma correction
- Wikipedia – Hybrid Log-Gamma
- Wikipedia – Log profile
- Wikipedia – Luma (video)
- Wikipedia – Michael Reichmann – “Reichmann proposed a new digital exposure method called exposing to the right (ETTR) in 2003.”
- Wikipedia – Super 35