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Bug Report: Inconsistent Volume Bar Border Colors Between v0.12.9b7 and v0.12.10b0 When Using make_marketcolors #676

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Description

@yorkjong

Description
When changing the volume colors using make_marketcolors, the results differ between versions v0.12.9b7 and v0.12.10b0. The older version looks fine, but in the newer version, the border color of the volume bars appears inconsistent.

Minimal Test Code

import mplfinance as mpf
import pandas as pd

# Sample data
dates = pd.date_range('2023-01-01', periods=10)
data = {
    'Open': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
    'High': [2, 3, 4, 5, 6, 7, 8, 9, 10, 11],
    'Low': [0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5],
    'Close': [2, 1, 4, 3, 6, 5, 8, 7, 10, 9],
    'Volume': [100, 200, 300, 400, 500, 600, 700, 800, 900, 1000]
}
df = pd.DataFrame(data, index=dates)

# Get the 'yahoo' style
yahoo_style = mpf.make_mpf_style(base_mpf_style='yahoo')

# Access the 'yahoo' style market colors
yahoo_market_colors = yahoo_style['marketcolors']

# Reverse the colors
reversed_market_colors = mpf.make_marketcolors(
    up=yahoo_market_colors['candle']['down'],
    down=yahoo_market_colors['candle']['up'],
    edge={'up': yahoo_market_colors['edge']['down'], 'down': yahoo_market_colors['edge']['up']},
    wick={'up': yahoo_market_colors['wick']['down'], 'down': yahoo_market_colors['wick']['up']},
    ohlc={'up': yahoo_market_colors['ohlc']['down'], 'down': yahoo_market_colors['ohlc']['up']},
    volume={'up': yahoo_market_colors['volume']['down'], 'down': yahoo_market_colors['volume']['up']}
)

# Define a new style with reversed colors
reversed_style = mpf.make_mpf_style(base_mpf_style='yahoo', marketcolors=reversed_market_colors)

# Plot the candlestick chart
mpf.plot(df, type='candle', volume=True, style=reversed_style)

Screenshots
v0.12.9b7 (looks fine):
download

v0.12.10b0 (the border color of the volume bars appears inconsistent):
download-1

Activity

  1. HOLL4ND commented on Aug 24, 2025

    @HOLL4ND

    2025,and still have this bug.

  2. added 2 commits that reference this issue on Mar 13, 2026
    be52795
    f29315b
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