To preserve instead of the elements that could be erased by the elimination of the green (or particularly eroded, as some parts a bit 'thin of the machine gun), we could also create an additional mask and insert it as an entry to "Core Matte". Save the file and return to the node editor, where we will insert the mask, through the Input > Mask node, to the "Garbage Matte" input of the Keying node, thus eliminating the wall that did not interest us. To close the curve, press the "Toggle Cyclic" button on the left (or on the ALT + C keys) Holding down the CTRL key, we create the mask by clicking with the left mouse button to select the area to be deleted. We then select the " Mask" mode and create a new mask, which we will call "Wall" (wall)
CHROMA KEY GREEN SCREEN MOVIE
To achieve it, select the Movie Clip Editor, then press the "Open" button (or use the drop down menu near the left) to load the movie
CHROMA KEY GREEN SCREEN HOW TO
How to hide it? We have to create a mask that eliminates everything that does not interest as trash. However, we note that the wall that was around the green screen is still present Possibly drag the cursor on the color selector to find the most appropriate value) To eliminate the green background we use the Matte > Keying node, clicking with the eyedropper on the green of the green screen (in case there are shadows we try to select a green that is an average of the light and dark green present, to eliminate as much as possible. Ie 960x540, we have to resize the original movie, whose dimensions were 1280x720, adding the Distort > Scale node, with the "Render Size" option set (in this case the "Stretch" option is fine because the movie has dimensions proportional to the desired ones ) If we want our final movie to be the same size as the default one To center the movie we press the "Fit" button in the right panel, which can be recalled by pressing the N key To have a preview of the results of our work in real time, we also add an Output > Viewer node, checking the "Backdrop" option below to display the result in the background So we load our movie by pressing the Open button. Since our input will not be a render but a movie, we replace the Render Layers node with the Input > Movie Clip node.
Then open Blender and select the node editor, clicking on " Compositing" and "Use Nodes" in the menu below
CHROMA KEY GREEN SCREEN FOR FREE
This tutorial assumes a basic understanding of using Blender, node editor and compositing.įor the tutorial we will use one of the movies released for free a few years ago by the well-known actor Jean Claude Van Damme, to which a wall has been added on the sides (because if you are not in a professional studio the green screen will probably be just a green cloth hanging on the wall or of metal supports).
The transparent parts will thus show the video or the image below, which will thus define the environment in which the subject of the first movie will act.
Through the technique of the chroma key a color is isolated (in our case the green of the green screen), or a particular luminance, it is removed and the area that was occupied by it becomes transparent, thus becoming part of the alpha channel. In this tutorial in English for Blender 3D, we will look at some basic concepts on how to crop an image or a movie, made with green screen, to overlay it on another image or movie.
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