Bluescreen Compositing. A Practical Guide for Video & by John Jackman

By John Jackman

Grasp the paintings and means of blue and greenscreen compositing with this entire how-to direction in developing powerful and life like composited scenes in video codecs. You get transparent, comprehensible causes of the differing kinds of keying thoughts and the way they paintings, together with real-world examples and tutorials. subject matters comprise constructing a greenscreen studio, tips on how to mild the reveal successfully, the best way to gentle the expertise or foreground fabric, and matching lighting fixtures to the composited heritage plate. entire tutorials of every of the key software program keyers stroll you thru the method for making a fresh and exact composite.

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Want a space shuttle to fly through the scene? No problem! at an angle to the camera so that the distance from camera to background (and all significant foreground subjects) is greater on one side of the screen than the other. 7 for the type of shot I’m talking about. The secret of this trick is a gradient matte, in which about the left quarter of the matte is black, the right quarter is white, and the middle quarters are a gradient. This is a separate graphic file (the same size as your video frames) that you will create in Photoshop simply using the gradient tool.

3. Set the foreground color to 255,255,255 white and the background color to 0, 0,O black (the Photoshop shortcut for this is “D” to set CHAPTER 4 I SIMPLE NON-ACTION COMPOSITINC SOLUTIONS the default foreground/background colors of black (fg) and white (bg), then “X” to swap them). Deselect the channel and use one of the drawing tools (your choice) to draw an outline of the “fixed” area you want to be opaque in the foreground overlay. Draw directly on the monochrome image visible in the Alpha Channel.

First, copy the picture into the new Alpha Channel. We’ll use it as a pixel-accurate guide for hand-drawing the transparency. To do this, click on any of the color channels above the new, empty channel to make it the active channel, then use Ctrl+A on a PC or Cmd+A on a Mac to select the entire frame, followed by Ctrl+C (Cmd+C)to copy the entire frame to the clipboard. Of course, once the entire channel is selected, you can also use the Edit>Copy command with your mouse. 2. Click on the empty Alpha Channel, and paste the clipboard into the channel using either Ctrl+V (Cmd+V)-or use the mouse for Edit>Paste.

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