Invert color issue on Mac mini 15.1 with Inswan INS-2 document camera

Mac mini 15.1

I convert text to white text on a black background

Using a inswan2 document camera and converting the

black letters/white background by invert command

the resulting black is very dull gray black instead of

intense black & not readable.

I tried classic invert & smart invert with different combinations of

contrast, transparency & color.

[Re-Titled by Moderator]