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bug#22343: 25.0.50; Incorrect rounding (?) when loading the Emacs.backgr
From: |
Clément Pit--Claudel |
Subject: |
bug#22343: 25.0.50; Incorrect rounding (?) when loading the Emacs.background attribute from Xresources |
Date: |
Mon, 11 Jan 2016 14:09:53 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 |
On 01/11/2016 01:56 PM, Eli Zaretskii wrote:
>> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
>> 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.
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