Infoseite // Which is the better for Green Color - Blue Screen shots?

Frage von B.DeKid:


Hi
I have a question about the Color Blue Srceen techniques.
I have somewhere aufgeschnappt times, which is consequently so on.

Green for Video (SD)
Blue film (35 mm)

I have to have the following numbers in your head 1:4.4.2 and 1:4.2.2
The figures I can no longer arrange in order.
This is what with the color? Sensitivity? to do.

I was years before this time in English casually explains. "
Could someone help me here, the information times correctly defined?
Thus I was a "German" Defination to have.
If, then this principle is synonymous to HD, in relation to SD so?

The



Antwort von Marinus:

Blue screen techniques, see Wikipedia.
In recent years, alternative green screen technique (synonymous Greenbox) developed (engl. = Green Screen Green Screen), which uses the same exemption process. About the question of what color to better results, there are different views, so that in the film industry with two colors are used.
Here you will find the explanation of both concepts.



Antwort von Axel:

Whether you are green or blue background take depends on the foreground and background that you use. Drives a shipwrecked on the (blue) under the sea (blue) sky, it would be better than synonymous Blue Keyingfarbe to choose. Conversely, in the case of jungle.

The reason lies in the so-called "spill," Reflections of Keyingfarbe to indemnify the foreground object, primarily, but not only, s.den object edges. Plugins like Keylight or Ultimatte have primarily Spill - fighting as a task. Even greater is the problem by the fact that DV and HDV, not the color for each pixel are ready. Worsening color = Chromakey unclean.
(Pirates of the Caribbean 3, the journey through the Arctic Ocean. The picture is full of green spill, synonymous Hollywood crap builds)

An alternative in such threads will always be mentioned by me: The luminosity - Key. This is the keying color "white. Synonymous But that's not quite true. Actually, only brightness information gekeyed a certain range of values.

Now it is fairly easy with video, a large white wall so krass to light (on Baustrahler Rauhfaser, the corridor becomes a studio) that in any case it is brighter than the foreground, even someone with giant white shirt washed or the teeth with pearlwhite cleans. When recording, the zebra function (warning of overexposed areas) to control.

In this method
- There is no Farbspill
- Color must not be respected
- Plays the 4:2:0 Farbsampling consumer codecs absolutely no (negative) role, since the brightness information for each pixel is stored.

I can only imagine that the Lumakey not enjoy great popularity because it is only for film scripts and the like was used. And Hollywood is just a model.
Film does not know the limitations of digital recording, signals that have a certain strength (brightness / luminance) over control, ie no incremental gradations are more presentable. Even film can be overexposed, but the transfer of an overexposed contour (highlight) on the skin is normally exposed on film no sharp edge but a soft course. That, because physical film a much-higher levels than it has video.

The disadvantage that Clipped areas completely out of the picture fall out, it is with the Lumakey use.



Antwort von Markus:

See synonymous:
" Bluescreen: Andere Farben?
" Which Camera for Blue Screen shots?



Antwort von B.DeKid:

Thanks guys as we come closer to the thing yet.
I personally use for years to halt the Green video or motion capture
and blue for just photos (rather reluctantly, because white is still in the studio photography s.besten come)
It was me more about the colors or numbers are there in your head somehow fixed have ;-)

Thanks for your contributions ;-)



Antwort von Hans-Otto:

When I read these posts so, then I wonder whether this really SOMEONE has the insight. Wikipedia is already the correct answer. Of all the herumreden around the hot porridge "only creates confusion. There is much nonsense written.



Antwort von SebiG:

"Hans-Otto" wrote: When I read these posts so, then I wonder whether this really SOMEONE has the insight. Wikipedia is already the correct answer. Of all the herumreden around the hot porridge "only creates confusion. There is much nonsense written.
Quod demonstrandum ERAD.



Antwort von Marinus:

What I have relating to Chromakey wanted to say. Whether Chromakey curtains or general. Blue or green background, is totally no preference. Prerequisite for a proper job is a clean, uniform and shadow-free illumination. And since I give the representatives Baustrahler absolutely right, Baustrahler are the most appropriate means for a prof. Illumination. It should not be synonymous in Chromakeyfarbe object that stands before the curtain, occur. Otherwise, a flawless cutting difficult. A good editing program, for which all parameters Chromakey Stock believes, is just for a successful working condition. The company offers Studio Accessories Lastolite Chromakey appropriate curtains in green and blue. Cheaper price, however, the Lastolite background boxes on the 11-meter roll (cardboard tube) and a width of 2.75 cm, dull and light, for price of 60 euros. Whether analog or digital recording also plays no role. Today, in studios basically digitally recorded.



Antwort von PowerMac:

"Marinus" wrote: (...) Baustrahler are the most appropriate means for a prof. Illumination. (...)

Please what?






Antwort von PowerMac:

"Marinus" wrote: (...) Whether analog or digital recording also plays no role. Today, in studios basically digitally recorded.

And I like to eat pizza. But what has that to do?



Antwort von Andreas_Kiel:

"Marinus" wrote: And since I give the representatives Baustrahler absolutely right, Baustrahler are the most appropriate means for a prof. Illumination.
If the wording would be: "with Baustrahlern a scene can illuminate cheap" could be the sign professionally? Neeeee.
BG, Andreas

PS: I have three Baustrahler for the illumination of interior spaces.



Antwort von leoHDV:

"Anonymous" wrote: "Hans-Otto" wrote: When I read these posts so, then I wonder whether this really SOMEONE has the insight. Wikipedia is already the correct answer. Of all the herumreden around the hot porridge "only creates confusion. There is much nonsense written.
Quod demonstrandum ERAD.
erat with "t", please ...



Antwort von B.DeKid:

"Hans-Otto" wrote: .... Wikipedia is already the correct answer. Of all the herumreden around the hot porridge "only creates confusion ......

Aha, well then I still wanted something to 1:4.4.2 figures and do not know wiki zetiert get HANS.
I work now NEN few years with Blue / Green Screen times but just wanted to know how I come to these figures, you just explained it to me in English Canada in times between the door and Angel (s :-) As the young straight NEN video Pink had rotated, I gave him faith. But Bernd has given me so NEN some nice links where had, thank you.
And Baustrahlern?! I usually find their light tone to "warm" I work with fluorescent tubes Color permanently installed 11 or 13 and when I use spotlight Multi Flash Vario 500 or just 3 out of spotlight Arri s Studio Series ..... I Baustrahler useful "to s.and" in Aussenberreich ... what synonymous but very nice and recommended PAR 56 spotlights with LED s are not so warm and the color of the light is synonymous in nem good range. (It may the well-connected s.den Stromagregator or several.
In the photo, I just felt fabrics and the Greenroom is fixed, that is plastered. This I did but of his professional from the region make the idea with substructure and fillets had.
Substances I personally only aufgespannte lanes I to outdoor photography (shootings) use. Since I usually get too much if the folds throw (Grrr :-()

Alla but thank füralle Tips



Antwort von PowerMac:

http://de.wikipedia.org/wiki/YCbCr-Farbmodell
http://de.wikipedia.org/wiki/Chroma_Subsampling



Antwort von B.DeKid:

THX ;-)
Hans see ... I looked for something as an explanation ;-)

Quote from wiki ....

YCbCr-sampling frequency for luma and chroma
One of the great advantages of YCbCr is that the sampling rate of the chrominance channels is lower than the Y channel can be, without causing an appreciable reduction in the guaranteed quality (chroma subsampling).

YCbCr 4:4:4 chroma-Resolutionidentisch to luminance resolution
YCbCr 4:1:1 chroma resolution horizontal and vertical quartered unchanged

For YCbCr 4:2:2
4:2:2 is a horizontal sub-sampling the color information (chroma) by a factor of 2, so the chrominance horizontal resolution is halved. The 4:2:2-coding corresponds to the "studio quality" digital video (ITU-R 601-4) and is of professional recording and editing hardware.

For YCbCr 4:2:0
4:2:0, the chroma-Resolutionsowohl horizontally than vertically synonymous halved. For transmission and for home use is typically used 4:2:0.

Now I have a real Defination my memory and learn how get the correct figures Combi is. Thanks Powermac @



Antwort von Gast´:

And what do we learn from this? Who read - Wikipedia bluescreen technology, see Wikipedia - may need no further foreign assistance. The issue was also Chromakey Curtain color GREEN or BLUE.
Hi
I have a question about the Color Blue Srceen techniques.
I have somewhere aufgeschnappt times, which is consequently so on.
Green for Video (SD)
Blue film (35 mm).