On 01/11/2016 01:56 PM, Eli Zaretskii wrote: >> From: Clément Pit--Claudel >> Date: Sun, 10 Jan 2016 16:19:50 -0500 >> >> This is a cute bug. Run the following two commands (in bash): >> >> # Set Emacs.background in Xresources >> $ xrdb <(echo "Emacs.background: #2e3436") >> # Run Emacs with same background on default face >> $ emacs -q --eval "(set-face-attribute 'default nil :background \"#2e3436\")" >> >> On my machine, the two colors are not rendered the same. I've attached a screenshot. What essentially happens is that anywhere where text is drawn the background is indeed #2e3436, but on the rest of the frame it's #2d3335. Amusingly, these two colors have distinct RGB and HSL values, but their CMYK and HSB values are the same (or so says http://rgb.to/hex/2d3335 and http://rgb.to/hex/2e3436, at least). >> >> The reason I came across this is that I use Emacs' tango-dark theme, which uses that background color. Since I didn't like Emacs popping up with a white background and immediately switching, I set the same background in my .Xresources. >> >> To observe the bug more clearly, just take a screenshot and open it in your favourite image editor, then use the magic wand with a tolerance of 0 (see other screenshot). Or use the color picker. >> >> What could cause this problem? A roundtripping issue with color conversions? > > Could this be the distant-background feature at work? I don't know :) How can I check? I was not aware of the distant-background feature; I'm only familiar with distant-foreground. Clément.