Colour gray black background

I know how to do to have the background in the window openings black and not dark gray, is it possiblle?
Thanks a lot!
Enrico

Excellent point, too often overlooked.
Fwiw, I like to use an immediately-perceivable difference in background luminance between the Viewer and the Browser so I can tell at a glance whether I am in a Browser or in a Viewer with many Images selected.
All true grays are neutral in hue (that's the definition of "gray") -- which makes me wonder: what does "neutral density" imply? According to the Wikipedia article, "neutral" refers to having the same effect on luminance while leaving hue unchanged. As such, "neutral seems to be a modifier of "filter" and not of "density".
I was under the impression the 18% is the standard luminance for half-way between the normally experienced extremes of "dark" and "light". I have always wanted to confirm this -- I settled on what I use above from trial and error (Viewer at 18%, Browser at 45%). According to this Wikipedia article, middle gray, also called "18% gray", is equivalent to c. 46% luminance in the sRGB color space. So for most users, setting the Viewer and Browser backgrounds to 46% (on a hardware calibrated display with fixed luminance settings) should give them the best perceptual results across a broad range of Images. Agree? Thoughts?
Next time I calibrate my displays I might measured the Aperture Viewer and Browser backgrounds after calibration. I'm still confused about the difference in the scales used for "18%" gray (18% of what?) and the sRGB gray of 46% (of what?).
--Kirby.

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Colour gray black background

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