Transparent colours or mixing function for stacked 3-band waveform bands?

[mxmilkiib]

Feature Description

Further to this conversation on Zulip (and the original PR #3153);

The 3-band stacked waveforms in Rekordbox are not just semi-transparent but either have specific colours for each combination of overlaying bands, or, more likely, use some specific colour mixing mode/function.

How about the possibility of emulating this in Mixxx?

high only: #FFFFFF
mid only: #FFA600
bass only: #0055E1

mid+high: #FFF0D7
bass+high: #D2DCFA
bass+mid: #B4690A

bass+mid+high: #F5EBD7

[mxmilkiib]

@m0dB; you've been looking at waveforms recently; might a band colour mix aspect for the waveform shader be possible to achieve a similar effect to Rekordbox?

[m0dB]

@mxmilkiib I find that hard to say from looking at the screenshots. I will ask around if someone has Rekordbox installed so I can have a look.

[mxmilkiib]

@m0dB sure thing. Fwiw, those shots are from the Android app, I installed it just to take the screenshots (of the demo files) then uninstalled it

[m0dB]

I think it is possible to use Rekordbox for a trial period, when I have some time I will give it a try.

I did try to understand what kind of alphablending would result in the RGB values you mention, but I don't see it yet. I see that mid+high and bass+high could come from overlaying mid or bass with ~30% transparency over high. But bass+mid, no idea.