if average close is above average open, the bars are coloured green, otherwise they are coloured red
It can be used as a general trend filter on weekly, daily bars. even on intraday timeframes, this would work well and give a sense of the current trend direction.
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.