Panasonic AV-HS400AN Adjusting the chroma key,  Executing auto sampling, Positioner, Aspect

3. Basic operations

3-3-6. Adjusting the chroma key

These steps are taken to adjust the chroma key definition. Before proceeding with the adjustments, select “Chroma” as the Type item setting in “3-3-1. Selecting the key type.”

The signal for the chroma key is created using a specific color tone as a reference.

For instance, the background color is detected from the image of a person who is standing in front of a specific background color, the key signal is created, and a different background is combined.

This unit employs an area system which is designated using a rectangular frame. The color of the pixels inside the area which have been averaged is used as the reference color of the chroma key (key reference), and the maximum deviation from the average value is used as the radius of the chroma key oval. Chroma keys faithful to the chroma space sample (area C in the figure) can be generated.

Executing auto sampling

The chroma component is sampled by specifying the screen area.

Chroma

Hue Radius	Hue
Sat Radius



Y

Oval-shaped chroma key

1Press the [FUNC] button to light its indicator, and press the [CHR KEY] button to display the CHR KEY menu.

2Turn [F1] to display the Auto sub menu, and turn [F2] to set On using the Marker item.

Even when a setting other than “Chroma” has been selected by the Type item in “3-3-1. Selecting the key type,” “Chroma” will still be automatically selected.

<Menu display>

Auto	Marker		Aspect	Sample↓
1/3	On	0.0		Start
	Off	−50.00
			+50.00

3The sample marker is displayed on the preview screen.

Select the area to be sampled using the positioner, rotary encoder [Z] and Aspect item (turn [F3] to adjust).

Positioner:

Specify the X coordinate and Y coordinate of the sample marker.

Rotary encoder [Z]:

Adjust the size of the sample marker.

When rotary encoder [Z] is held down, the X and Y coordinates of the sample marker as well as the size of the marker are returned to their initial values.

Aspect:

Change the aspect ratio of the sample marker.

4When the [F5] switch or the rotary encoder [Z] is pressed, the hue component of the area selected by the marker is sampled.

5On completion of the sampling, the sampled values are reflected on the Adjust1 and Adjust2 sub menus, and a chroma key combined image is output to preview. (Set the key preview function to ON.)

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