The example latex document that I have pasted below contains a simple PGF figure (just an empty square background) that I generated with matplotlib. If you set your emacs to a dark theme, you will see that the previews are dark-on-light if the preview includes the figure but light-on-dark if it is not included. So `preview-region` with the region just including the \section and first equation environment generates exactly the expected preview, but `preview-buffer` inverts the colors in *all* previews, i.e. the section header and equation are now dark on light background, which does not mesh well with a dark emacs theme.
Best, Marten \documentclass{article} \usepackage{tikz} \begin{document} \section{PGF screws up Background} \begin{equation*} f(x) = \int_{0}^{\infty} \exp(-x^{2}) \mathrm{d}x \end{equation*} \begin{figure}[htbp] \centering \begingroup% \makeatletter% \begin{pgfpicture}% \pgfpathrectangle{\pgfpointorigin}{\pgfqpoint{1.666667in}{1.000000in}}% \pgfusepath{use as bounding box, clip}% \begin{pgfscope}% \pgfsetbuttcap% \pgfsetmiterjoin% \definecolor{currentfill}{rgb}{1.000000,1.000000,1.000000}% \pgfsetfillcolor{currentfill}% \pgfsetlinewidth{0.000000pt}% \definecolor{currentstroke}{rgb}{1.000000,1.000000,1.000000}% \pgfsetstrokecolor{currentstroke}% \pgfsetstrokeopacity{0.000000}% \pgfsetdash{}{0pt}% \pgfpathmoveto{\pgfqpoint{0.000000in}{0.000000in}}% \pgfpathlineto{\pgfqpoint{1.666667in}{0.000000in}}% \pgfpathlineto{\pgfqpoint{1.666667in}{1.000000in}}% \pgfpathlineto{\pgfqpoint{0.000000in}{1.000000in}}% \pgfpathclose% \pgfusepath{fill}% \end{pgfscope}% \end{pgfpicture}% \makeatother% \endgroup% \caption{A PGF figure.} \label{fig:pgf-figure} \end{figure} \begin{equation*} f(x) = \int_{0}^{\infty} \exp(-x^{2}) \mathrm{d}x \end{equation*} \end{document} --------------------------- Emacs : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0) of 2020-09-19 Package: 13.0.14 Run buffer contents: Running `Preview-LaTeX' on `example' with ``pdflatex -interaction=nonstopmode -file-line-error \&prv_example "/AUCTEXINPUT{" example.tex "}"'' This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020/Debian) (preloaded format=pdflatex) restricted \write18 enabled. entering extended mode LaTeX2e <2020-10-01> patch level 4 L3 programming layer <2021-01-09> xparse <2020-03-03> CUSTOMISED FORMAT. Preloaded files: . article.cls 2020/04/10 v1.4m Standard LaTeX document class size10.clo 2020/04/10 v1.4m Standard LaTeX file (size option) tikz.sty 2020/12/27 v3.1.8b (3.1.8b) pgf.sty 2020/12/27 v3.1.8b (3.1.8b) pgfrcs.sty 2020/12/27 v3.1.8b (3.1.8b) pgfrcs.code.tex pgfcore.sty 2020/12/27 v3.1.8b (3.1.8b) graphicx.sty 2020/09/09 v1.2b Enhanced LaTeX Graphics (DPC,SPQR) keyval.sty 2014/10/28 v1.15 key=value parser (DPC) graphics.sty 2020/08/30 v1.4c Standard LaTeX Graphics (DPC,SPQR) trig.sty 2016/01/03 v1.10 sin cos tan (DPC) graphics.cfg 2016/06/04 v1.11 sample graphics configuration pdftex.def 2020/10/05 v1.2a Graphics/color driver for pdftex pgfsys.sty 2020/12/27 v3.1.8b (3.1.8b) pgfsys.code.tex pgfsyssoftpath.code.tex 2020/12/27 v3.1.8b (3.1.8b) pgfsysprotocol.code.tex 2020/12/27 v3.1.8b (3.1.8b) xcolor.sty 2016/05/11 v2.12 LaTeX color extensions (UK) color.cfg 2016/01/02 v1.6 sample color configuration pgfcore.code.tex pgfcomp-version-0-65.sty 2020/12/27 v3.1.8b (3.1.8b) pgfcomp-version-1-18.sty 2020/12/27 v3.1.8b (3.1.8b) pgffor.sty 2020/12/27 v3.1.8b (3.1.8b) pgfkeys.sty pgfkeys.code.tex pgfmath.sty pgfmath.code.tex pgffor.code.tex tikz.code.tex . (./example.tex (/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def) No file example.aux. (/usr/share/texlive/texmf-dist/tex/context/base/mkii/supp-pdf.mkii [Loading MPS to PDF converter (version 2006.09.02).] ) (/usr/share/texlive/texmf-dist/tex/latex/epstopdf-pkg/epstopdf-base.sty (/usr/share/texlive/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg)) (/home/ml/.emacs.d/straight/build/auctex/latex/preview.sty (/usr/share/texlive/texmf-dist/tex/generic/luatex85/luatex85.sty) (/home/ml/.emacs.d/straight/build/auctex/latex/prtightpage.def) (/home/ml/.emacs.d/straight/build/auctex/latex/prauctex.def No auxiliary output files. (/home/ml/.emacs.d/straight/build/auctex/latex/prauctex.cfg)) (/home/ml/.emacs.d/straight/build/auctex/latex/prfootnotes.def) Preview: Fontsize 10pt P... [...] ....9 \begin{equation*} ./example.tex:10: Missing $ inserted. <inserted text> $ l.10 f(x) = \int _{0}^{\infty} \exp(-x^{2}) \mathrm{d}x ./example.tex:11: Missing $ inserted. <inserted text> $ l.11 \end{equation*} ./example.tex:11: Preview: Snippet 2 ended.(563432+233020x6750219). <-><-> l.11 \end{equation*} [2] ./example.tex:13: Preview: Snippet 3 started. <-><-> l.13 \begin{figure} [htbp] ./example.tex:41: Preview: Snippet 3 ended.(6305509+0x22609920). <-><-> l.41 \end{figure} [3] ./example.tex:43: Preview: Snippet 4 started. <-><-> l.43 \begin{equation*} ./example.tex:43: Undefined control sequence. \equation* ...oindent }{\endgroup }\pr@\equation* l.43 \begin{equation*} ./example.tex:44: Missing $ inserted. <inserted text> $ l.44 f(x) = \int _{0}^{\infty} \exp(-x^{2}) \mathrm{d}x ./example.tex:45: Missing $ inserted. <inserted text> $ l.45 \end{equation*} ./example.tex:45: Preview: Snippet 4 ended.(563432+233020x6750219). <-><-> l.45 \end{equation*} [4] ) (see the transcript file for additional information)</usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx12.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmex10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmr7.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy7.pfb> Output written on example.pdf (4 pages, 61267 bytes). Transcript written on example.log. TeX Output exited as expected with code 1 at Fri Nov 5 14:33:08 Running `Preview-PDF2DSC' with ``pdf2dsc example.pdf example.prv/tmpo0zR3C/preview.dsc'' Preview-PDF2DSC finished at Fri Nov 5 14:33:08 Running `Preview-Ghostscript' with ``/usr/bin/rungs -sOutputFile\=example.prv/tmpo0zR3C/pr1-\%d.png -q -dDELAYSAFER -dNOPAUSE -DNOPLATFONTS -dPrinted -dTextAlphaBits\=4 -dGraphicsAlphaBits\=4 -sDEVICE\=png16m -r244.974x244.343 -dDELAYBIND'' Preview-Ghostscript finished at Fri Nov 5 14:33:08 current state: ============== (setq AUCTeX-version "13.0.14" LaTeX-command-style '(("" "%(PDF)%(latex) %(file-line-error) %(extraopts) %(output-dir) %S%(PDFout)") ) image-types '(svg png gif tiff jpeg xpm xbm pbm) preview-image-type 'png preview-image-creators '((dvipng (open preview-gs-open preview-dvipng-process-setup) (place preview-gs-place) (close preview-dvipng-close)) (png (open preview-gs-open) (place preview-gs-place) (close preview-gs-close)) (jpeg (open preview-gs-open) (place preview-gs-place) (close preview-gs-close)) (pnm (open preview-gs-open) (place preview-gs-place) (close preview-gs-close)) (tiff (open preview-gs-open) (place preview-gs-place) (close preview-gs-close)) ) preview-dvipng-image-type 'png preview-dvipng-command "dvipng -picky -noghostscript %d -o %m/prev%%03d.png" preview-pdf2dsc-command "pdf2dsc %(O?pdf) %m/preview.dsc" preview-gs-command "/usr/bin/rungs" preview-gs-options '("-q" "-dDELAYSAFER" "-dNOPAUSE" "-DNOPLATFONTS" "-dPrinted" "-dTextAlphaBits=4" "-dGraphicsAlphaBits=4") preview-gs-image-type-alist '((png png "-sDEVICE=png16m") (dvipng png "-sDEVICE=png16m") (jpeg jpeg "-sDEVICE=jpeg") (pnm pbm "-sDEVICE=pnmraw") (tiff tiff "-sDEVICE=tiff12nc")) preview-fast-conversion t preview-prefer-TeX-bb nil preview-dvips-command "dvips -Pwww -i -E %d -o %m/preview.000" preview-fast-dvips-command "dvips -Pwww %d -o %m/preview.ps" preview-scale-function 'cqql-preview-scale-up preview-LaTeX-command '("%`%l \"\\nonstopmode\\nofiles\\PassOptionsToPackage{" ("," . preview-required-option-list) "}{preview}\\AtBeginDocument{\\ifx\\ifPreview\\undefined" preview-default-preamble "\\fi}\"%' \"\\detokenize{\" %(t-filename-only) \"}\"") preview-required-option-list '("active" "tightpage" "auctex" (preview-preserve-counters "counters")) preview-preserve-counters nil preview-default-option-list '("displaymath" "floats" "graphics" "textmath" "sections" "footnotes") preview-default-preamble '("\\RequirePackage[" ("," . preview-default-option-list) "]{preview}[2004/11/05]") preview-LaTeX-command-replacements nil preview-dump-replacements '(preview-LaTeX-command-replacements ("\\`\\([^ ]+\\)\\(?: +\\(?:\\(--?kanji[= ][^ ]+\\)\\|\\(--?output-directory[= ][^ ]+\\)\\|-\\(?:[^ \\\"]\\|\\\\.\\|\"[^\"]*\"\\)*\\)\\)*\\(.*\\)\\'" "\\1 -ini \\2 \\3 -interaction=nonstopmode \"&\\1\" " preview-format-name ".ini \\4") ) preview-undump-replacements '(("\\`\\([^ ]+\\)\\(?: +\\(?:\\(--?kanji[= ][^ ]+\\)\\|\\(--?output-directory[= ][^ ]+\\)\\|-\\(?:[^ \\\"]\\|\\\\.\\|\"[^\"]*\"\\)*\\)\\)*.* \"\\\\input\" \"\\\\detokenize{\" \\(.*\\) \"}\"\\'" "\\1 \\2 \\3 -interaction=nonstopmode -file-line-error " preview-format-name " \"/AUCTEXINPUT{\" \\4 \"}\"") ) preview-auto-cache-preamble t preview-TeX-style-dir "/home/ml/.emacs.d/straight/build/auctex/latex" ) Output from running `/usr/bin/rungs -h': GPL Ghostscript 9.54.0 (2021-03-30) Copyright (C) 2021 Artifex Software, Inc. All rights reserved. Usage: gs [switches] [file1.ps file2.ps ...] Most frequently used switches: (you can use # in place of =) -dNOPAUSE no pause after page | -q `quiet', fewer messages -g<width>x<height> page size in pixels | -r<res> pixels/inch resolution -sDEVICE=<devname> select device | -dBATCH exit after last file -sOutputFile=<file> select output file: - for stdout, |command for pipe, embed %d or %ld for page # Input formats: PostScript PostScriptLevel1 PostScriptLevel2 PostScriptLevel3 PDF Default output device: x11alpha Available devices: alc1900 alc2000 alc4000 alc4100 alc8500 alc8600 alc9100 ap3250 appledmp atx23 atx24 atx38 bbox bit bitcmyk bitrgb bitrgbtags bj10e bj10v bj10vh bj200 bjc600 bjc800 bjc880j bjccmyk bjccolor bjcgray bjcmono bmp16 bmp16m bmp256 bmp32b bmpgray bmpmono bmpsep1 bmpsep8 ccr cdeskjet cdj1600 cdj500 cdj550 cdj670 cdj850 cdj880 cdj890 cdj970 cdjcolor cdjmono cdnj500 cfax chp2200 cif cljet5 cljet5c cljet5pr coslw2p coslwxl cups declj250 deskjet devicen dfaxhigh dfaxlow display dj505j djet500 djet500c dl2100 dnj650c epl2050 epl2050p epl2120 epl2500 epl2750 epl5800 epl5900 epl6100 epl6200 eplcolor eplmono eps2write eps9high eps9mid epson epsonc escp escpage faxg3 faxg32d faxg4 fmlbp fmpr fpng fs600 gdi hl1240 hl1250 hl7x0 hocr hpdj1120c hpdj310 hpdj320 hpdj340 hpdj400 hpdj500 hpdj500c hpdj510 hpdj520 hpdj540 hpdj550c hpdj560c hpdj600 hpdj660c hpdj670c hpdj680c hpdj690c hpdj850c hpdj855c hpdj870c hpdj890c hpdjplus hpdjportable ibmpro ijs imagen inferno ink_cov inkcov itk24i itk38 iwhi iwlo iwlq jetp3852 jj100 jpeg jpegcmyk jpeggray la50 la70 la75 la75plus laserjet lbp310 lbp320 lbp8 lex2050 lex3200 lex5700 lex7000 lips2p lips3 lips4 lips4v lj250 lj3100sw lj4dith lj4dithp lj5gray lj5mono ljet2p ljet3 ljet3d ljet4 ljet4d ljet4pjl ljetplus ln03 lp1800 lp1900 lp2000 lp2200 lp2400 lp2500 lp2563 lp3000c lp7500 lp7700 lp7900 lp8000 lp8000c lp8100 lp8200c lp8300c lp8300f lp8400f lp8500c lp8600 lp8600f lp8700 lp8800c lp8900 lp9000b lp9000c lp9100 lp9200b lp9200c lp9300 lp9400 lp9500c lp9600 lp9600s lp9800c lps4500 lps6500 lq850 lxm3200 lxm5700m m8510 md1xMono md2k md50Eco md50Mono md5k mgr4 mgr8 mgrgray2 mgrgray4 mgrgray8 mgrmono miff24 mj500c mj6000c mj700v2c mj8000c ml600 necp6 npdl nullpage oce9050 ocr oki182 oki4w okiibm oprp opvp paintjet pam pamcmyk32 pamcmyk4 pbm pbmraw pcl3 pclm pcx16 pcx24b pcx256 pcxcmyk pcxgray pcxmono pdfimage24 pdfimage32 pdfimage8 pdfocr24 pdfocr32 pdfocr8 pdfwrite pdfwrite pdfwrite pgm pgmraw pgnm pgnmraw photoex picty180 pj pjetxl pjxl pjxl300 pkm pkmraw pksm pksmraw plan plan9bm planc plang plank planm plib plibc plibg plibk plibm png16 png16m png256 png48 pngalpha pnggray pngmono pngmonod pnm pnmraw ppm ppmraw pr1000 pr1000_4 pr150 pr201 ps2write psdcmyk psdcmyk16 psdcmykog psdrgb psdrgb16 pwgraster pxlcolor pxlmono r4081 rinkj rpdl samsunggdi sj48 spotcmyk st800 stcolor t4693d2 t4693d4 t4693d8 tek4696 tiff12nc tiff24nc tiff32nc tiff48nc tiff64nc tiffcrle tiffg3 tiffg32d tiffg4 tiffgray tifflzw tiffpack tiffscaled tiffscaled24 tiffscaled32 tiffscaled4 tiffscaled8 tiffsep tiffsep1 txtwrite uniprint x11 x11alpha x11cmyk x11cmyk2 x11cmyk4 x11cmyk8 x11gray2 x11gray4 x11mono xcf xcfcmyk xes xpswrite Search path: /usr/share/ghostscript/9.54.0/Resource/Init : /usr/share/ghostscript/9.54.0/lib : /usr/share/ghostscript/9.54.0/Resource/Font : /usr/share/ghostscript/fonts : /var/lib/ghostscript/fonts : /usr/share/cups/fonts : /usr/share/ghostscript/fonts : /usr/local/lib/ghostscript/fonts : /usr/share/fonts Ghostscript is also using fontconfig to search for font files For more information, see /usr/share/doc/ghostscript/Use.htm. On debian system you may need to install ghostscript-doc package. Please report bugs to bugs.ghostscript.com.
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