Create contrasting Color

[Joe]

I don't know if contrasting is really the right word but here's what I mean.

Take a normal Listbox (or similar) when the test is selected the text turns
blue. If the background is blue the text turns white. This happens in
different combinations of forecolor - backcolor combinations.

How can I determine what is the right color (contrasting color) to use?

 

[Bob Powell [MVP]]

For a direct contrast you can invert the RGB. This works for most cases
except 50% gray.

Color.FromArgb(255-myColor.R, 255-myColor.G,255-myColor.B)

You can also detect the brightness and pick a suitable contrasting colour
that way. Alternatively you can obtain the hue and use the opposite hue.
There is an article on HSB usage in the GDI+ FAQ.

--
Bob Powell [MVP]
Visual C#, System.Drawing

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