The font that we finally agreed on is a bit more quadratic than in Konstantins round watch. If you find the results not to your liking, try the simpler formula above. Pebble watch face according to the design by hop-picker. The threshold of 0.179 should not be changed since it is tied to the W3C guidelines. That formula is also given in the guidelines and it looks like the conversion from sRGB to linear RGB followed by the ITU-R recommendation BT.709 for luminance. Or approximately: if L > 0.179 use #000000 else use #ffffff This simplifies down algebraically to: if L > sqrt(1.05 * 0.05) - 0.05 Given the luminance of the color you're testing as L the test becomes: if (L + 0.05) / (0.0 + 0.05) > (1.0 + 0.05) / (L + 0.05) use #000000 else use #ffffff If the contrast for black is greater than the contrast for white, use black, otherwise use white. The luminance of black is 0.0 and white is 1.0, so substituting those values lets you determine the one with the highest contrast. The formula given for contrast in the W3C Recommendations (WCAG 2.0) is (L1 + 0.05) / (L2 + 0.05), where L1 is the luminance of the lightest color and L2 is the luminance of the darkest on a scale of 0.0-1.0. For an interesting look into the problems with this see Contrast Ratio Math and Related Visual Issues. It has step counters now, and support for bike tracking is coming soon. If you don't need to conform to W3C rules then I'd stick with the simpler formula above. PlexFit is a new Pebble app that allows users of the Smartwatch to get their Google Fit information onto their device. Herewith I derive a modified form that always chooses the highest contrast based on the guidelines. Pebble selected this font because it allows a relatively large number of characters to be displayed on a single line, also because the font has an excellent readability vs. However, one of the comments below shows it can lead to non-compliance with W3C guidelines in some circumstances. Based on the comments below a threshold of 150 may work better for you.Įdit: The above is simple and works reasonably well, and seems to have good acceptance here at StackOverflow. The threshold of 186 is based on theory, but can be adjusted to taste. Once you have the intensities for the individual colors, you can determine the overall intensity of the color and choose the corresponding text. I won't get into the details of the conversion here, they're easy to look up. Each 2 digits of the code represent a value in hexadecimal (base-16) notation. You need to break the hex code into 3 pieces to get the individual red, green, and blue intensities. Building on my answer to a similar question.
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