I have an idea for improving vibrancy, but right now it’s just a thought 
experiment. I don’t know how to accomplish it, so I wonder if you guys could 
provide any advice.

I just posted this suggestion to Apple’s OS X feedback site: "Please consider 
adding NSVisualEffectBlendingModeDesktop and making it the default for objects 
like the Source View which reside in an app's main or document window. A window 
with that visual effect mode would use the desktop image ONLY for vibrancy 
blending. Doing so would be kind to users: they have chosen the desktop image 
presumably because it and its colors are pleasing. Blending with other randomly 
intervening windows due to the current default of 
NSVisualEffectBlendingModeBehindWindow is unkind to users because (a) it 
ignores the user's clearly expressed preference for the desktop image (b) 
without conveying any useful information whatsoever.”

Well, I’m not going to hold my breath. But it did occur to me that an app’s 
main/document window could accomplish something similar by creating its own 
secondary window that would somehow “stick” behind it. The secondary window’s 
only purpose would be to replicate the portion of the desktop image occluded by 
its bounds. That way, no matter what apps are running, it would show a portion 
of the desktop image, and though users would never actually see this secondary 
window, the main/document window would blend with it, giving the user pleasing 
vibrancy using the desktop image he has chosen.

Is this possible, do you think, to open a window that always hides directly 
behind the working window?      

— 

Charles
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