Video Chroma Key, Video Color Key, Color Separation
Overlay, Green or Blue Screen, Background or Backdrop,
Video Compositing & Matting     -     Model 617CEC

Video Chroma-Key, Video Chromakey, Video Color Key, Color Separation Overlay The Model 617CEC 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.

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 to display it on the output monitor. 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.

Description Application Notes Online Ordering & Prices


Model: 617CEC: Video Chroma Key, Video Color Key, Color Separation Overlay
Function: Replaces designated color in foreground picture with background picture
Owner's Manual: Manual-617CEC.pdf
Size: 8"W x 8"L x 1.6"H
Mounting: Free standing or optional 19" rack
Power Connector: IEC 13
Power Input: 100-240 VAC
Chassis: Painted Aluminum
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
Adjust Key Color Phase Tolerance (trim potentiometer)
Adjust Key Luma Level Tolerance (trim potentiometer)

Description Application Notes Online Ordering & Prices
PO Box 928    Boulder, CO 80306 USA    Tel +1-303-530-9580    Fax +1-303-530-9569   
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