algorithm - Determine font color based on background color -

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Given a system (for example a website) that optimizes the background color for a user for some section , But there is no font color (to keep the number of choices at least), is there a way to programmatically determine whether a "light" or "dark" font color is necessary?

I'm sure there are some algorithms, but I am not sure enough about color, shine, etc. to understand it on my own, to understand it on my own.

I had to face the same trouble. I should get a good method to select opposite font colors to display text labels on color kells / heatmaps. It should be a universal method and the resulting color was to be "good looking", which means that the simpler complementary color was not a good solution - sometimes it generates a weird, very intense color that was hard to see and read.

After long hours of trying to solve this problem and trying, I came to know that the best solution is to select white font for "black" colors, and for the "bright" colors There is a black font.

Example of function C #: 

  Color contrast color (color color) {int d = 0; // Count of perceptional luminance - Human eyes are in favor of green color ... double A = 1 - (0.299 * color. R + 0.587 * color .g + 0.114 * color .b) / 255; If (a & lt; 0.5) d = 0; // bright color - black font other D = 255; // Dark Color - Return the white font color. FOMARBBB (D, D, D); }

It was tested for many different colors (rainbow, grayscale, summer, ice, and many others) and this is the only "universal" method I have found.

edit
changed the formula for counting "deceptive shine" to count a - it looks really better!

Edit 2 @WebSeed has provided a brilliant example of this algorithm:


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