Sony Comprehensive Guide to BKDF Stereo System Basic Operations and Adjustments

DFS-700/700P

Chapter 3 Basic Operation

1-35

Inserting Characters and Graphics (1) — Title Key

Adjusting the hue range for chroma keying (the “angle” setting)

If there are fluctuations in the background color in the foreground image, it may not be immediately possible to key the background image into the whole of the desired background. In this case, you can correct this by increasing the range of hues (the “angle” setting) used for chroma keying. (This means using a wider-angled sector of the hue circle.)

Angle setting (Example: using a blue background color)

•Increasing the angle increases the range of hues replaced by the background image, including shades of cyan and magenta.

•Decreasing the angle decreases the range of hues replaced by the background image, restricting it to closely-matching blues.

Note

If the foreground image includes a color close to the “background” color in a position not intended to be replaced by the background image, then if you make the hue range too wide this part will also be filled by the background image (key fill).

Eliminating bleeding of colors into the edge of the inserted image (color cancel function)

In a chroma key composite image, on the boundary of the inserted image, the “background” keying color in the foreground image (usually blue) tends to bleed into the boundary with the background image. In this case, by replacing the keying color in the composite image by another color (for example gray), the boundary is made to stand out less. This function is called “color cancel”.

To use the color cancel function, use the following procedure.

1 In the TITLE section of the menu control section, press the CRK button, turning it on, and display page 2 of the chroma key menu.

The following example appears when the CRK button in column 1 is lit.

T1CRK	COLCAN	Sat	Hue	FILL	Densty
2/3	ON	0-100	0-99	VIDEO	0-100
PAGE	F1	F2	F3	F4	F5

2 In the effect transition section, press the TITLE button, turning it on, then press the CUT button.

A composite of the foreground and background images appears in the program monitor.

3 Press the F1(COLCAN) button, setting the parameter to “ON”.

3-42Chapter 3 Basic Operation

4 Watching the composite image on the program monitor, turn the F3(Hue) and F2(Sat) knobs, until the boundary between the background image and foreground image provides a natural match of hue and saturation.

Creating a composite image with a semi-transparent foreground image (density function)

You can make the inserted image semi-transparent, and insert it into the background image.

Use the following procedure.

1 In the TITLE section of the menu control section, press the CRK

	button, turning it on, to display page 2 of the chroma key menu.
	The following example appears when the CRK button in column 1 is
	lit.						Chapter3
	T1CRK	COLCAN	Sat	Hue	FILL	Densty
	2/3	ON	0-100	0-99	VIDEO	0-100	Basic
	PAGE	F1	F2	F3	F4	F5
2	F5(Densty) knob, to adjust the transparency of the inserted image.						Operation
	Watching the composite image on the program monitor, turn the

Chapter 3 Basic Operation 3-43