[iOS] Some media item art colour extractions fail

[remon1496]

Context

• Operating system and version: iOS 26.5
• App version: TestFlight 1.0 (25)
• Music Assistant server version: 2.8.7 Stable

Details

Problem description

The PR that closed #335 introduced fixes for the colors used for theming the player. The behaviour greatly improved on android, but on iOS not so much. Still see a lot of purple on items/examples that where discussed. Looked at the PR for this and the functionality lives in the common code.

I've atached many examples comparing iOS with Android, trent seems to be that is happens on images witha lot of black or lots of white in it (doesn't matter if its perfect white, perfect black or slightly offset).

Robot told this after I fed it the code, not saying robot is correct, but might help choosing a direction to solve this:

"The root cause is almost certainly in getBestColor. The image is ~95% black, so dominantSwatch has very low luminance and gets rejected — but then vibrantSwatch on iOS either returns null or picks something unexpected, causing the fallback to your purple theme color."

Steps to reproduce

1. Play album 4x4=12 by deadmau5

Expected behavior

I expect (sort of) the same colors as on Android. Which are dope!

1st = iOS > 2nd = Android

[remon1496]

[remon1496]

[remon1496]

[remon1496]

[remon1496]

[remon1496]

[remon1496]

[remon1496]

[remon1496]

[seadowg]

I had a look at this, but it was really hard to work out without the ability to debug with a running iOS app. I think once we update Compose Multiplatform we'll hopefully be able to debug from Android Studio and figure out what's going on here.

[formatBCE]

BTW purple isn't "weird", it's just theme-default. This means that the method of extracting the color from image failed instead of e.g. produced incorrect value. Renaming issue.

[seadowg]

BTW purple isn't "weird", it's just theme-default. This means that the method of extracting the color from image failed instead of e.g. produced incorrect value. Renaming issue.

Yup good point! I should have added that detail as that's what's really confusing me: I can hack the code to set explicit colors and everything works fine, but for some reason the "swatches" we're calculating result in us just using the theme colors (implying the colors that we get are all null).