Wow, just finished relaxing after a hard week on set, and I come online to find some young upstart scoffing at everything i wrote!
This is directed to ( and stars
)mister LeathalWolf.
Firstly, my dear boy, if one of my grandchildren came up to me and asked where babies come from, or about the inner workings of a car, I'm not going to explain in precise details the appliances of sciences or the dynamics of mechanics ( hmmm, there's a song in there, somewhere
).
So, likewise, when a person asks ( and, no offence intended here "Rhett7660" ) a basic newbie question about video, I tried to explain in a technical minimalist way, but still, with some facts and truths scattered in the midst. So when I see you tearing apart my explanations with such a conceited and arrogant mannerism, well, it just ticked me right off. So, to restore my honor, I shall endeavor to redefine my explanations, whilst casually taking your criticisms apart. And don't bother replying, because Im not going to check back either.
So, quiet on set, lets begin now!
"light sensitivity (the lux rating) has nothing to do w/chroma subsampling, it is a ratio not a rating, and ycbcr does not stand for green, blue, red (ycbcr and rgb are two separate color spaces"
Ok, firstly, I see you are to a degree schooled in the technicalities, but its now time for you to stop regurgitating definitions; think boy THINK OUTSIDE the text book, ok?.
4:2:2 is not a ratio, it is a value, and any mathematician or professional technician will agree, which is why we say "Four Two Two", and not "Four by Two by Two", or even "Four into Two into Two". A three part ratio gives a three dimensional matrix where values are X to the Y to the Z, and not a vector quantity.
I called it light sensitivity because I did not want to go into the nitty gritty of the whole Y=Luma and Cb is the chroma channel which is the Luma Y minus the blue values ( or range between Yellow And Blue
) etc. But at the end of the day, it all boils down to light values. Let me walk you through the park of your mind and hopefully open the gates a little ( hmmm, there's a song in there somewhere..)
Basic colour theory 101.
We are dealing with an additive colour system, which means all the primary colours of light add up to give white. Colour itself is the diffusion of part of the reflected incidence ray of light. The colour of an object absorbs the rest of the colour spectrum and only reflects its own frequency. Colour is basically chroma which is nothing but reflected or captured ( in the case of electric video ) light.
I wanted to avoid this summerised ( but no way absolute technical definition ) to people reading this thread, so therefore gave a simplistic but true Name - Personally, I know it has little to do with the LUX Frequency Sampling Capabilities Of A Camera.
Finally ( for this part ) Chroma Subsampling ( Y:Cb:Cr ) And RGB are two colour spaces, Yes, but not separate. The value 4:4:4 in Y:Cb:Cr is The Equavalent Of RGB, and therefore they are related and or directly proportional to each other.
I'm not sure what you mean by "cheaper professional cameras" when until recently no video camera recorded 4:4:4. 4:2:2 is pretty much the de-facto standard for 'professional' gear with 4:4:4 only coming into play on very high end and/or very post processing heavy projects.
Depends on how you define "recently"; kid, you're probably aware that even six months in this industry is like a lifetime, so consequently 4:4:4 recording has been around for Donkeys Years. Check out GrassValleys dual link Viper which captures raw RGB data right off a HD-900F's CCDs, and this was Waaaaaay back in 01.
I define "Cheaper Professional Cameras" as anything that cost under £15,000, which is about $25,000 - $30,000 usd. I work in FaT, not in old Uncle Jessies "Memories Are There To Be Cherrished ( Over, And Over Again! )" ( hmmm, there's a song in there somewhere
)
The very fact we use 4:4:4 is to try and limit the, what was it
."very post processing heavy projects" by getting the colour correct in the first place ( though, having said that, there still is a bit of play needed here and there
. { there's song in there, somewhere
..} )
Again, not accurate in the least. Are you gonna tell me that a 3ccd handicam from best buy is going to give better image quality than the red one, panavision genesis or the arriflex d-21?
Like for like, dear boy, LIKE For LIKE!. I don't compare Aston Martins with Fords Fiestas - At least stay in the same price bracket!
Your enthusiasm is good, but your info is off.
Good God you sound like Darth Vader!
Phrases like "Arrogant Prick" and "What You Think You Know, You Don't Know" ( thanks Will Smith! ) spring to mind, but then I forget that you are just here to help people out too, and you do have some great advice to offer I'll give you that. But when you've been in this industry for as long as I have, I hope you will have learned that everyone, no matter their skill level, has something to teach, and that you wont go around trying to belittle people even if their advise may "Seem" somewhat
"Inaccurate".
Barney
