Updated BB %B REVERSAL_v2 with Trading session background
study(title = "VDUB BB %B REVERSAL_v3", shorttitle = "vdub_BB_%B_rev_v3")
length = input(21, minval=1)
src = input(close, title="Source")
mult = input(0.001, minval=0.001, maxval=50)
basis = sma(src, length)
dev = mult * stdev(src, length)
upper = basis + dev
lower = basis - dev
bbr = (src - lower)/(upper - lower)
plot(bbr, color=teal, style=histogram, linewidth=4)
plot(bbr, color=black, style=line, linewidth=2)
//========================bgcolor=================================
timeinrange(res, sess) => time(res, sess) != 0
premarket = #0050FF
regular = #0000FF
postmarket = #5000FF
notrading = na
sessioncolor = timeinrange("30", "0400-0930") ? premarket : timeinrange("30", "0930-1600") ? regular : timeinrange("30", "1600-2000") ? postmarket : notrading
bgcolor(sessioncolor, transp=85)