In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.
Here is the formula again:
study("Boring Candle", overlay=true)
candleColor = ( abs(open-close)/abs(high-low) > 0.5 )? (open < close ? green : red) : blue
plotcandle(open, high, low, close, color = candleColor)
but when i tried with this ( abs(open-close)/abs(high-low) > 0.5 ) i got error.. means all the candles are got to be colored so that i asked