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Video Chroma Key, Video Color Key, Color
Separation
Overlay, Green or Blue Screen, Background or Backdrop,
Video Compositing & Matting
- Model 617S
The Model 617S Video Chroma Keyer (Chromakey), Chroma Keyer, or Video Color Keying (Key) & Color Separation
Overlay system, is a two-input, one-output, device that replaces a selected color in a "foreground" picture
with details from corresponding areas of "background" picture or backdrop. The video chroma-key removes the
selected color, chroma key blue screen (bluescreen) or chroma-key green screen (greenscreen), for example, or a
narrow range of colors, from the foreground image to "reveal" the background image or backdrop "behind" it.
This technique is also called video color keying, color key, blue screen chroma key, green screen chroma key, or
color separation overlay. Chromakey video can also be called compositing or matting, and involves adding a
different background electronically. A switch allows selection of the foreground image only, or the keyed image
consisting of elements from both foreground and background images. The Model 617S Video Chroma Key, Video Color
Key and Color Separation Overlay system can also freeze the background or backdrop input so that it can continue
to be used for keying indefinitely.
In use, a key color is first captured by pressing the unit's "capture" button while the foreground camera is
viewing only the desired color, for example, blue or green. This color can be subsequently checked by pressing
the "display" button. The unit's tolerance for error in the key color can be adjusted in terms of both phase and
brightness. For instance, the color phase range control could determine that only a very tight range of green is
acceptable for keying or that a wider range, possibly from blue through green to yellow is acceptable. Similarly,
the luma range control could determine that the key color is acceptable whether bright or dark, or could determine
that only a tight brightness range is to be keyed causing the unit to put in the background image where only
slight shadows are cast in the foreground.
Specifications
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Model: |
617S: Video Chroma Key, Video Color Key, Color Separation Overlay |
| Function: |
Replaces designated color in foreground picture with background picture |
| Size: |
6.9"W x 4.9"L x
2.4"H sloping to 1.4"H |
| Mounting: |
Free standing desktop |
| Power Connector: |
5.5 x 2.5 mm coaxial power jack, center-pin positive |
| Power Input: |
5 VDC (100-240 VAC Adaptor included where appropriate) |
| Chassis: |
Black ABS |
| Video Inputs/Output: |
1Vp-p, composite, 75 ohm |
| I/O Connectors: |
BNC |
| Controls |
Capture Key Color (button) |
| Display Key Color (button) |
| Output (switch): Foreground Only/Keyed |
| Background (switch): Freeze/Live |
| Adjust Key Color Phase (button) |
| Adjust Key Luma Level (button) |
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Adjust (potentiometer): Sets value of button-selected parameter |
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