GNU bug report logs - #36315
27.0.50; SVG transparency handling is inaccurate

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From: Alan Third <alan <at> idiocy.org>
To: Qiantan Hong <qhong <at> mit.edu>
Cc: "36315 <at> debbugs.gnu.org" <36315 <at> debbugs.gnu.org>
Subject: bug#36315: Incorrect SVG color
Date: Fri, 18 Dec 2020 15:00:34 +0000

On Fri, Dec 18, 2020 at 12:49:23AM +0000, Qiantan Hong wrote:
> Is there any update on this bug?
> The current behavior is unacceptable when the SVG color
> is supposed to be the same as some color in Emacs
> (in my case, I’m using SVG to build some UI elements),
> The following code
> 
> (require 'svg)
> 
> (defun make-image (color)
>   (let ((svg (svg-create 100 100)))
>     (svg-rectangle svg 0 0 100 100 :fill color)
>     (svg-image svg)))
> 
> (set-frame-parameter (window-frame) 'background-color “#f00000")
> 
> (insert (propertize " " 'display (make-image "#f00000")))
> 
> produce very notable color difference.

I can no longer replicate this on the master branch on macOS. We've
out-sourced colour handling fully to librsvg now, so that may make the
difference?

Either that or macOS is doing something unusual with colours, which I
wouldn't rule out.
-- 
Alan Third

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