For colors I'd expect to have one color, one white, and the other 2 black...
I guess it depends on the gradient of color.
If you have FF,00,00 maybe it shows more black pixels, while FF,80,80 might show less black.
It would be nice to go into MS paint (the one provided by your Windows) and manually select a color (double click the color, and change the color value from 0 to 255); and paint some small squares and do some testing like that.
I have a microscope which I'm planning on using, unfortunately it does not have a USB connection for image transfers to pc's.
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