so, if you understand a lot of this stuff may I ask an out of topic question:-
Film "look" got its unique aesthetic because of the film medium it was shot on and looked different from what was shot on video tape. Now everything is digital, why do movies still have that "film" look?
is it possible they manipulate the digital video in colour and lighting to make it look like film medium?
Excellent question!
From my understanding, "film look" is mostly down to the following (in no particular order of importance)
1) Frame rate - as you know film is conventionally shot at 24 frames per second for most real-time action (with obvious exceptions for slow motion and "sped-up" playback resulting from recording at a lower or faster frame rate and then playing back at 24fps). Quite a lot of video is shot at 30fps or 60fps (or 25/50 in Europe) because that is the TV standard and it's just easier to deal with. The result is the typical "soap opera" effect where the reduced motion blur (often combined with "high key" lighting) makes it look very different to film.
(Some high budget feature films diverge from this, notably "The Hobbit" at , by filming at high frame rates (48fps - albeit with digital cameras), which creates a "hyper-real" look with high fidelity but reduced motion blur. A lot of people hated it.
2) Dynamic range - a lot of cheaper video equipment has a far smaller dynamic range than film stock. This is range from black to white. Chemical 35mm film can get maybe 12-14 stops of dynamic range, which is now matched by high end digital cameras, but not cheaper ones. Lower dynamic ranges means there is less contrast overall (not being able to see graduation in the shadow or dark areas or blowing out the highlights ).
3) Sensor technology - after a certain point, the specifications of high-end video sensor look similar but they have different qualities (sometimes called "colour science" amongst other terms). Small, cheap sensors of the sort found in phones and cheaper cameras are unlikely to match this quality. Digital cinema cameras often try to reproduce the "film look" through technological solutions. That said the fact you can get an entry-level 4K cinema camera for <$1500 days means high quality is far more accessible these days.
4) Lighting - a lot of what we think of as "video look" is due to lighting, resulting from all of the above. TV shows shot in video were (previously) fairly cheap and used lots of interior sets, that then had to lit fairly harshly to overcome limitations in dynamic range, and also because the "mood" of productions (sitcoms etc.) called for "high-key" lighting. These days digital cameras would mostly used the same kinds of lighting as film cameras (with the advantage that you can often push digital cameras a lot harder in dark conditions by boosting the gain/ISO)
5) Shutter speed - this is only really an issue where you can't control this, such as phones. Normally, you choose a shutter speed that is twice your frame rate, or 1/48s when recording at 24fps. The shutter speed also affects how we perceive motion and how it interacts with the frame rate. Having a faster shutter speed creates a "choppier" effect - one of the best known examples being the Omaha beach scene in "Saving Private Ryan". It captures each frame for less time, resulting in less motion blur, but at the same frame rate. Cameras that vary this automatically based on light, or choose high shutter speeds to reduce motion blur can look a bit weird.
I'm sure there a few others! Film is also "analog" and has grain and difference colour responses and processing steps that can alter its look, so this is also a big part of why it looks different. It's the same argument as vinyl vs digital music, and shows that even if modern technology is objectively more accurate, it may not appeal to us aesthetically.
To answer you second question, yes, nearly digital video that ends up on TV/Cinema (other than news, live TV etc.) is processed in post-production, mostly to match colours between scenes. Most film is edited the same way on digital systems though, and I doubt that there is much "chemical manipulation" (colour timing) done these days on film stock. The lighting used for digital and film cameras is pretty much the same these days AFAIK