The Cineflat article is nice, since it has some good info. And
yes Jake, users can make their own flat profiles. I linked to the article because the folks at Cineflat made the free profile they're offering using Nikon Picture Control Editor software, and for the illustrations and data they post.
As they wrote, "Although you could manually dial down contrast and saturation in camera, one of the most popular Nikon flat picture controls out there for cine is
Tassinflat mady by Ulysse Tassin. While shooting using a flat picture control will look flat and contrast-lacking straight out of camera, flat footage will actually retain a greater amount of detail and dynamic range when it comes down to editing and color grading later on, which is great. Another popular profile is Alvaro Yus."
and they continued---"Don’t get us wrong; Tassinflat and all other profiles out there are still excellent flat, logarithmic picture controls. However, Tassinflat’s custom curve was specifically engineered to prevent highlight clipping, at the expense of dark shadows. Alvaro Yus, another flat cine profile, improved on Tassinflat’s shadows by focusing on shadow detail instead, at the expense of highlights. We thought, why not combine both?"
and "
Therefore we launched Nikon Picture Control Editor (an unofficial, online version) and modified Tassinflat’s curves (which is itself based on Nikon’s neutral profile) for a better shadow response while still maintaining the reverse curve in the highlight zone. Our goal here was to do a logarithmic curve while still preventing highlight clipping. Theoretically at least, compressing both the highlights and the shadows should yield the best results in terms of dynamic range. After measurement, we found out that Cineflat indeed brings up about 1 extra stop of dynamic range compared to Tessinflat."
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So, yeah, the folks at Cineflat basically are offering a free, tone curve and gamma correction profile,
a flat profile, that users could make and load themselves, using an online version (!) of FREE Nikon software. And they also point users to the Tassinflat flat profile, the Alvaro Yus flat profile, and their flat profile, as well as telling people a bit about flat profiles, and providing some valuable illustrations of the curves and the numbers to enter,etc..
This might explain why Nikon did not feel the need to release a firmware update for a Nikon D610 flat profile, as the OP asked about: Why would they need to, when Nikon Picture Control Editor allows anybody to make any kind of profile they want, and when video enthusiasts world-wide can create 4kb size images to make flat profiles with freeware that comes with every new Nikon since what, was it the the D40, in 2007?
Again...in this thread we have a member saying that , "Nobody uses the picture controls anyway,"....uhhhhhh....not really an accurate statement. The picture controls system is part of the core of Nikon color adjustment for serious workers who want to adjust the way the camera writes images to the memory card...