Quote from Pr0crast:
Yes, very important, and pretty common sense too if you think about it.
Example: Look at a doji bar (opens and closes at the same price). Most charting software considers that a "black" bar. Just because the charting software considers it a black bar, that doesn't mean that YOU should.
You should develop a mental process that looks at the price bar and immediately deducts what % of the corresponding volume bar is ACTUALLY black or red.
Don't trust the software. Trust your brain.