Compositing and Compositing

on green screen

Definition of Compositing

The Compositing is able to express the feeling and status of the subject and mood

through color, mass and shape because it does not tell the story that the Compositing

and not the image "

And the Compositing is the result of linking and combining all elements of the work

of art in order to get to the shape that we want or aspire to access to express the state

of what is a subject and we work during the merger and linked together in the form

of Compositing, "which is the reasonable arrangement of people in a group through

the use of confirmation, Sequence and balance to achieve clarity and beauty that

appeal to people "

The Compositing enters everything technical,.

The Compositing not confined to the stage or paintings only, but even in the cinema

also there is a Compositing through (inventory) staff work in a snapshot of a

situation, thus creating a language of understanding between the recipient and the

film, and this language is the Compositing. (Compositing.

Green Screen Compositing:

Here is the importance of green screen in our daily lives

Blockbuster movies, video games, news reports and video clips will not be the

same today without the use of a green screen.Also known as chroma key or

Chroma keying, this technique allows people and objects to be placed anywhere

by replacing their real background. The reality or environment of 3D, and the

creation of scenes appropriate to the scenario or scene lies in the addition of jokes

that have an important role in unifying the color of the scene entirely, where the

color of the scene with the object added very real . .

• The use of color correction used in the environment with the object Green

Screen is one of the most important steps that make the scene realistic and ideal:

A lot of effects play an important role in correcting the image’s colors and I will

mention some of these effects

- Levels, Exposure and Hue/Saturation , Curves effect , Lumetri Color

effect …

this tools, although simple, use them correctly and provide perfect quality

in color correction. These tools are widely used in color correction and are

used in the most Severely films presented in the tv and cinema.

In order to use them effectively you need to understand how they work:.

Example:

color correction effect

The final result

he reasons for the use of chroma also: (The customer needs in some cases: creating a

scene for a film or an advertisement containing scenes of violence and scenes

dangerous according to the scenario is difficult to implement on the ground, causing

significant physical and physical losses here Green Screen is the appropriate solution

of the presentation of scenarios This is not the case for other production stages,

where visual effects (vfx) can help make impossible impossible again

Levels:-

- the upper "Input" sliders are used to increase values while the lower "Output" sliders

are used to decrease value

and "Output Black" decreases or lightens shadows.

It has the most accurate modification properties

and. The Channel dropdown menu at the top allows you to select whether to modify the

overall image (RGB) or each individual color channel (red, blue, green or alpha).

-Exposure:

Darkens or brightens the shadows and midtones with minimal change to the highlights.

Gamma Correction

The amount of gamma correction to use for adding an additional power-curve

adjustment to the image. Higher values make the image lighter; lower values make the

image darker. Negative values are mirrored around zero (that is, they remain negative

but still get adjusted as if they were positive). The default value is 1.0, which

corresponds to no additional adjustment

But the values are adjusted when the Mayan render is used to return the colors

Adjusts gamma values to 2.02 and returns to their real effects .

Hue/Saturation : -

Adjusting the saturation, or purity of the color, represents a move across its radius. Use

the Colorize control to add color to a grayscale image converted to RGB, or to add color

to an RGB image.

This effect works with 8-bpc, 16-bpc, and 32-bpc color

. Lumetri Color effect: -

Lumetri Color is GPU-accelerated for faster performance. Using these tools, you can

adjust color, contrast, and light in your sequences in new and innovative ways.

- Matching the colors in the actor plate to the environment will require Levels

adjustments to the individual R, G and B color channels only.

Note: Green Screen is clean and pure, and the intelligent selection

of light mounted on the object or cricket is representative of the

lighting used in the surrounding environment (eg daylight or

sunset) and adjusts the direction of the shadows. Reduce the effort

and effort in adjusting the environment, and add many jokes to

create the atmosphere of the scene corresponding to the cricket or

vice versa.

clean and natural-looking matte is crucial to getting good results. Hours

are spent tweaking the various controls "perfect"

Reference :

http://www.theserverside.com/definition/compositing

https://www.pinterest.com/pin/513480794994985025/

https://vimeo.com/202516691

By asmaa al saqqa

2017