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diff --git a/guides/imagemagick.org b/guides/imagemagick.org
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-ImageMagick recipes I should stuff into config files or scripts, but
-haven't yet.
-* Configuration
-** Allow conversion from/to PDF
-- Open ImageMagick's =policy.xml= configuration file.
-- Locate the =<policy>= tag with a =pattern= including "PDF".
-- Comment it out.
-* Comparing images
-~magick compare~ is a thing; ~magick convert~ can also do [[https://stackoverflow.com/a/33673440][neat stuff]]:
-#+begin_src sh
-convert '(' a.png -flatten -grayscale Rec709Luminance ')' \
-        '(' b.png -flatten -grayscale Rec709Luminance ')' \
-        '(' -clone 0-1 -compose darken -composite ')' \
-        -channel RGB -combine diff.png
-#+end_src
-
-* Adding watermarks
-Someday, in the Glorious Future, every thirdparty that insists on
-having a copy of my personal documents will be legally obligated to
-request it from a trusted government service that steganographizes the
-requester's identity in the files they send.
-
-Until then…
-#+begin_src sh
-#!/bin/bash
-
-set -eu
-
-src=$1
-dst=$2
-label=$3
-
-mark ()
-{
-    local marksrc=$1
-    local markdst=$2
-
-    w=$(identify -format '%w\n' "$marksrc" | head -1)
-    h=$(identify -format '%h\n' "$marksrc" | head -1)
-    textw=$((w/3))
-    texth=$((h/8))
-
-    pointsize=$((80*w/2500))
-    offx=$((100*w/2500))
-    offy=$((400*h/3500))
-
-    convert -size ${textw}x${texth} xc:none                 \
-            -fill '#80808080' -pointsize $pointsize         \
-            -annotate 340x340+${offx}+${offy} "$label"      \
-            miff:- |                                        \
-        composite -tile - "$marksrc" "$markdst"
-}
-
-if [[ "$src" =~ \.pdf ]]
-then
-    # AFAICT if I feed a multi-page PDF to composite, it outputs only
-    # the first page.  Jump through hoops to split and concatenate the
-    # PDF; also, roundtrip through JPG because setting -density (to
-    # preserve a good quality) messes with the size calculations for
-    # the label.
-
-    tmpd=$(mktemp -d)
-    bname=$(basename "$src")
-    qpdf --split-pages "$src" "${tmpd}/$bname"
-
-    shopt -s extglob
-
-    for page in ${tmpd}/${bname/%.pdf/-+([0-9]).pdf}
-    do
-        convert -density 300 -flatten "$page" "${page/.pdf/.jpg}"
-        mark "${page/.pdf/.jpg}" "${page/.pdf/-MARKED.jpg}"
-        convert -density 300 "${page/.pdf/-MARKED.jpg}" "${page/.pdf/-MARKED.pdf}"
-    done
-
-    qpdf --empty --pages ${tmpd}/${bname/%.pdf/-+([0-9])-MARKED.pdf} -- "$dst"
-
-    exit
-fi
-
-mark "$src" "$dst"
-#+end_src