Avision AVA6 Plus (BS-0504/BS-0610S) - Manual (Page 32)

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Invert Reverses the brightness and the colors in the
image. The default setting is Black on a White
background. Reverse mode is White on a Black
background. For color images, each pixel will be
changed into its complementary color at the
command of Invert.
Black on White
White on Black