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What is the most commonly used or most appropriate coloring scheme for indicating loudness when visualizing an audio fft result, for instance in “jumping bars” audio equalizer displays, spectrograms, spectrographs, and etc.
Red for the loudest? Blue for very quiet? Or???
In the audio apps I’ve shipped, it’s green, yellow, red. But that wasn’t based on any standard – just a guess based on the led outputs of my stereo. 🙂
I think the answer is a balance between how serious you want your VU-METER to be. Are you trying to show scientific precision of dB levels or just something that’s meant to be visual eye candy as music is playing? If the latter, you got a lot of freedom to work with, including making the increment between volume units non-linear (such that the vu-meter seems more “lively”) and choosing whatever color scheme looks best.