Sony CCD-TRV608 - Manual (Page 207)

Hard Light
The pixels of the foreground image will be lightened
if they are 50% brighter than the pixels of the
background image. Black and white pixels remain
unchanged.
Darken
Displays only the parts of the foreground image that
are darker than the background image.
Lighten
Displays only the parts of the foreground image that
are lighter than the background image.
Difference
Subtracts the foreground color from the background
color, or vice versa, depending on which has the
greater brightness value.
Transparency slider
Drag the slider to specify the transparency of the
picture.
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