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Subject: bug#77841: Some svg image's black color is replaced by emacs's theme foreground color
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Content preview: I found this issue when debugging org LaTeX preview, see >
When using themes with background color set to #000000,
and org-preview-default-process
is set to dvisvgm, the LaTeX fragments are displayed incorrectly. > > To
reduplicate: > > 1. Switch to a theme [...]
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I found this issue when debugging org LaTeX preview, see
https://list.orgmode.org/87cydchjqn.fsf@HIDDEN/T/#ed7ba8310f82e8be8a2e7360df1568ed485434df3
> When using themes with background color set to #000000, and org-preview-default-process is set to dvisvgm, the LaTeX fragments are displayed incorrectly.
>
> To reduplicate:
>
> 1. Switch to a theme with background color set to #000000 (like Modus Vivendi)
> 2. Set org-preview-default-latex-process to dvisvgm
> 3. Create an org-mode document. Write some LaTeX fragment and press C-c C-x C-l to preview LaTeX fragment.
> 4. The LaTeX preview is displayed as a white rectangle.
>
> After debugging, I found that it is because dvisvgm omitts the default #000 color value when generating SVG file, and emacs has a unique way of displaying the SVG, which caused foreground color to be applied to it.
>
> A solution is to change org-format-latex-options to use transparent background by default. I've attached this fix.
It turned out that emacs displays svg images differently compared to an
image viewer. I can reduplicate this issue when I use emacs to view this
svg image, which emacs replaces the image's black color with the current
theme's foreground color:
https://commons.wikimedia.org/wiki/File:Flag_of_the_German_Democratic_Republic.svg
See also (Chinese): https://emacs-china.org/t/emacs-30-1-svg/29217
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Billy Lei <LeiYiXia29@HIDDEN> Subject: bug#77841: Acknowledgement (Some svg image's black color is replaced by emacs's theme foreground color) Message-ID: <handler.77841.B.174480574814902.ack <at> debbugs.gnu.org> References: <SY7P300MB0734287FC9582B87929FE366D7BD2@HIDDEN> X-Gnu-PR-Message: ack 77841 X-Gnu-PR-Package: emacs Reply-To: 77841 <at> debbugs.gnu.org Date: Wed, 16 Apr 2025 12:16:03 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 77841 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 77841: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D77841 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#77841: Some svg image's black color is replaced by emacs's theme foreground color
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Date: Wed, 16 Apr 2025 15:55:08 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <SY7P300MB0734287FC9582B87929FE366D7BD2@HIDDEN>
(message from Billy Lei on Wed, 16 Apr 2025 20:09:46 +0800)
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> Date: Wed, 16 Apr 2025 20:09:46 +0800
> From: Billy Lei <LeiYiXia29@HIDDEN>
>
> I found this issue when debugging org LaTeX preview, see
> https://list.orgmode.org/87cydchjqn.fsf@HIDDEN/T/#ed7ba8310f82e8be8a2e7360df1568ed485434df3
>
> > When using themes with background color set to #000000, and org-preview-default-process is set to dvisvgm, the LaTeX fragments are displayed incorrectly.
> >
> > To reduplicate:
> >
> > 1. Switch to a theme with background color set to #000000 (like Modus Vivendi)
> > 2. Set org-preview-default-latex-process to dvisvgm
> > 3. Create an org-mode document. Write some LaTeX fragment and press C-c C-x C-l to preview LaTeX fragment.
> > 4. The LaTeX preview is displayed as a white rectangle.
> >
> > After debugging, I found that it is because dvisvgm omitts the default #000 color value when generating SVG file, and emacs has a unique way of displaying the SVG, which caused foreground color to be applied to it.
> >
> > A solution is to change org-format-latex-options to use transparent background by default. I've attached this fix.
>
> It turned out that emacs displays svg images differently compared to an
> image viewer. I can reduplicate this issue when I use emacs to view this
> svg image, which emacs replaces the image's black color with the current
> theme's foreground color:
>
> https://commons.wikimedia.org/wiki/File:Flag_of_the_German_Democratic_Republic.svg
>
> See also (Chinese): https://emacs-china.org/t/emacs-30-1-svg/29217
Yes, this is a feature. I think to disable it, you need to include a
:background setting in the image spec. Alan, am I right?
X-Loop: help-debbugs@HIDDEN
Subject: bug#77841: Some svg image's black color is replaced by emacs's theme foreground color
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Date: Wed, 16 Apr 2025 17:22:41 +0100
From: Alan Third <alan@HIDDEN>
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On Wed, Apr 16, 2025 at 03:55:08PM +0300, Eli Zaretskii wrote:
> > Date: Wed, 16 Apr 2025 20:09:46 +0800
> > From: Billy Lei <LeiYiXia29@HIDDEN>
> >
> > I found this issue when debugging org LaTeX preview, see
> > https://list.orgmode.org/87cydchjqn.fsf@HIDDEN/T/#ed7ba8310f82e8be8a2e7360df1568ed485434df3
> >
> > > When using themes with background color set to #000000, and org-preview-default-process is set to dvisvgm, the LaTeX fragments are displayed incorrectly.
> > >
> > > To reduplicate:
> > >
> > > 1. Switch to a theme with background color set to #000000 (like Modus Vivendi)
> > > 2. Set org-preview-default-latex-process to dvisvgm
> > > 3. Create an org-mode document. Write some LaTeX fragment and press C-c C-x C-l to preview LaTeX fragment.
> > > 4. The LaTeX preview is displayed as a white rectangle.
> > >
> > > After debugging, I found that it is because dvisvgm omitts the default #000 color value when generating SVG file, and emacs has a unique way of displaying the SVG, which caused foreground color to be applied to it.
> > >
> > > A solution is to change org-format-latex-options to use transparent background by default. I've attached this fix.
> >
> > It turned out that emacs displays svg images differently compared to an
> > image viewer. I can reduplicate this issue when I use emacs to view this
> > svg image, which emacs replaces the image's black color with the current
> > theme's foreground color:
> >
> > https://commons.wikimedia.org/wiki/File:Flag_of_the_German_Democratic_Republic.svg
> >
> > See also (Chinese): https://emacs-china.org/t/emacs-30-1-svg/29217
>
> Yes, this is a feature. I think to disable it, you need to include a
> :background setting in the image spec. Alan, am I right?
Yes, but in this particular case :foreground, probably.
This behaviour is documented in the elisp manual under "SVG Images"
and is intended to make it easier to insert images into buffers so
they look like native widgets and the like.
We only set the default foreground and background colours, we don't
override explicitly set colours. The easiest work-around for someone
generating an SVG for display in Emacs is to just not set foreground
and background colours at all, and then they'll both match the current
theme (and also work correctly in web browsers).
(IMHO if an SVG needs a specific colour, like the black in the German
flag above, it should be setting the colour explicitly, rather than
relying on the image viewer's default settings.)
--
Alan Third
X-Loop: help-debbugs@HIDDEN
Subject: bug#77841: Some svg image's black color is replaced by emacs's theme foreground color
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Subject: bug#77841: Some svg image's black color is replaced by emacs's theme foreground color
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> From: Lei Billy <LeiYiXia29@HIDDEN>
> CC: Eli Zaretskii <eliz@HIDDEN>, "77841 <at> debbugs.gnu.org"
> <77841 <at> debbugs.gnu.org>
> Date: Thu, 17 Apr 2025 10:16:48 +0000
>
> Does emacs exists some options that can be customized to make svg image spec use black as the foreground color by default? IMO users should be able to change this behavior, so that emacs can be compatible with svg images that don't set the #000000 color explicitly.
I don't understand why you say this. Emacs behaves with SVG images as
it does with text: the colors of the face override the default colors.
IOW, it's a feature, not a bug. As Alan says, images that want to
display specific colors should specify that in the image spec.
X-Loop: help-debbugs@HIDDEN
Subject: bug#77841: Some svg image's black color is replaced by emacs's theme foreground color
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Lei Billy <LeiYiXia29@HIDDEN> writes:
> Does emacs exists some options that can be customized to make svg
> image spec use black as the foreground color by default? IMO users
> should be able to change this behavior, so that emacs can be
> compatible with svg images that don't set the #000000 color
> explicitly.
I don't think there is an option for this but FWIW, DocView (when
producing SVG) does exactly this with its own face (`doc-view-svg-face')
that forces black on white by default.
--
Manuel Giraud
GNU bug tracking system
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