If I were to then ask, "which color is better?", there's NO way you could assess that, because the photo is tainted by the light in the room, the camera used, and finally the monitor you are looking at.
That's a good point. Things can get very murky without a consistent sonic point of reference.
This has been previously referred to by the likes of Toole and Olive who talk of audios circle of confusion.
Their hope is that that the use of more consistent, better measured loudspeakers in recording studios will go a long way towards eliminating this circle of confusion.
Otherwise, vintage recordings made and mastered on vastly different monitors are likely to sound substantially different when played back on loudspeakers built today.
Thankfully when it comes to colour reproduction we already have a reference. International colour charts such as the British Standards Colour chart linked below.
I became aware of such charts after reading that Morrissey used such a chart to instruct his record company on the exact shade of green he wanted for the Smiths brilliant 'The Queen is Dead' album.
Having such a familiar reference always helps us poor humans whenever we are comparing things as we ourselves seem to be rather more inconsistent than most electronic equipment.
I would agree that you could say Speakers A are slightly brighter than Speakers B. But SO WHAT!!
That alone could be an enormous help to someone drawing up a shortlist for audition purposes.
https://seanolive.blogspot.com/2009/10/audios-circle-of-confusion.html?m=1
https://britishstandardcolour.com/