commit 7ac001c42410e1b4cce3efd4ba4b29c01beb30e4
Author: Tilman Kranz <tilman.kranz@b1-systems.de>
Date:   Sat Dec 9 20:44:11 2023 +0100

    initial commit

diff --git a/01-rename.sh b/01-rename.sh
new file mode 100755
index 0000000..625db2a
--- /dev/null
+++ b/01-rename.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+##
+# Main Program
+
+dir=$(dirname "$(readlink -f "$0")")
+origdir="$dir/orig"
+indir="$dir/in"
+
+if ! cd "$dir" ; then
+    echo "ERROR: Could not change to directory \"$dir\"; aborted." >&2
+    exit 1
+elif ! test -d "$origdir" ; then
+    echo "ERROR: Directory \"$origdir\" not found; aborted." >&2
+    exit 1
+elif ! mkdir -p "$indir" ; then
+    echo "ERROR: Could not create directory \"$indir\"; aborted." >&2
+    exit 1
+elif !  rm -f -- "$indir/"*.jpg ; then
+    echo "ERROR: Could not remove files in \"$indir\"; aborted." >&2
+    exit 1
+else
+    i=1
+    rv=0
+
+    while read -r jpg ; do
+        renamed=$(printf "%02d" "$i").jpg
+
+        if cp "$jpg" "$indir/$renamed" ; then
+            echo "INFO: Copied \"$jpg\" to \"$renamed\"." >&2
+        else
+            echo "WARNING: Could not copy \"$jpg\" to \"$renamed\"." >&2
+            rv=1
+        fi
+
+        i=$((i+1))
+    done < <(ls --reverse --sort time -- "$origdir/"*.jpg)
+
+    exit "$rv"
+fi
+
diff --git a/02-convert.sh b/02-convert.sh
new file mode 100755
index 0000000..da225f5
--- /dev/null
+++ b/02-convert.sh
@@ -0,0 +1,187 @@
+#!/bin/bash
+
+##
+# Configuration
+
+# Before morphology analysis, reduce image dimensions by this factor
+simplify=2
+
+# Morphology to apply to reduce content to main area
+morphology="Open:6"
+morphology_shape="Disk"
+
+# Color simplification to apply (50x50% means black/white)
+random_treshold="50x50%"
+
+# Treshold for connected components detection
+area_treshold=500
+
+# Parameters for sigmoidal contrast adjustment for trimming
+sigmoidal_contrast_trim="35,30%"
+
+# Parameters for sigmoidal contrast adjustment for result images
+sigmoidal_contrast="45,50%"
+
+# Number of colors result images are quantized to
+posterize=6
+
+# Keep intermediate images after processing (note that they will be removed in
+# any case at the next run of this script)
+keep_tmpfiles=true
+
+##
+# Main Program
+
+dir="$(dirname "$(readlink -f "$0")")"
+tmpdir="$dir/tmp"
+indir="$dir/in"
+comdir="$dir/com"
+outdir="$dir/out"
+resize_percent=$((100/simplify))
+
+if ! cd "$dir" ; then
+    echo "ERROR: Could not change to directory \"$dir\"; aborted." >&2
+    exit 1
+elif ! mkdir -p "$comdir" "$outdir" "$tmpdir" ; then
+    echo "ERROR: Could not create working directories; aborted." >&2
+    exit 1
+elif ! rm -f -- "$comdir/"*.* ; then
+    echo "ERROR: Could not delete existing component files; aborted." >&2
+    exit 1
+elif ! rm -f -- "$tmpdir/"*.* ; then
+    echo "ERROR: Could not delete existing tempfiles; aborted." >&2
+    exit 1
+elif ! rm -f -- "$outdir/"*.* ; then
+    echo "ERROR: Could not delete existing results; aborted." >&2
+    exit 1
+else
+    rv=0
+
+    for jpg in "$indir/"*.jpg ; do
+        base=$(basename "$jpg" .jpg)
+        tmp1="$tmpdir/$base.tmp1.png"
+        tmp2="$tmpdir/$base.tmp2.png"
+        com="$tmpdir/$base.com.png"
+        trimmed="$tmpdir/$base.trimmed.png"
+        inf="$tmpdir/$base.txt"
+        out="$outdir/$base.png"
+
+        if ! convert \
+            "$jpg" \
+            -colorspace RGB \
+            -sigmoidal-contrast "$sigmoidal_contrast_trim" \
+            -resize "$resize_percent%" \
+            -channel All -random-threshold "$random_treshold" \
+            -morphology "$morphology" "$morphology_shape" \
+            "$tmp1"
+        then
+            echo "ERROR: Could not create test image \"$tmp1\"; skipped." >&2
+            rv=1
+            continue
+        fi
+
+        draw=()
+
+        while read -r primitive ; do
+            draw+=("-fill" "white" "-draw" "$primitive")
+        done < <(
+            convert \
+                "$tmp1" \
+                -define connected-components:verbose=true \
+                -define connected-components:exclude-header=true \
+                -define connected-components:sort-order=increasing \
+                -define connected-components:area-threshold="$area_treshold" \
+                -virtual-pixel None \
+                -connected-components 8 \
+                -auto-level \
+                "$com" | \
+            perl -e '
+                while(<>){
+                    chomp;
+                    next unless /(\d+)x(\d+)\+(\d+)\+(\d+)/;
+                    printf
+                        STDERR
+                        "DEBUG: component: $_\n";
+                    printf
+                        "rectangle %d,%d,%d,%d\n",
+                        $1, $2, $1+$3, $2+$4;
+                }
+
+            ' | \
+            sort | \
+            uniq
+        )
+
+        printf "DEBUG: connected components in \"%s\":" "$tmp1"
+        for d in "${draw[@]}" ; do
+            printf " \"%s\"" "$d"
+        done
+        printf "\n"
+
+        if ! convert \
+            "$tmp1" \
+            -fill black -colorize 100 \
+            "${draw[@]}" \
+            "$tmp2"
+        then
+            echo "ERROR: Could not convert \"$tmp1\" to \"$tmp2\"; skipped." >&2
+            rv=1
+            continue
+        elif ! convert \
+            "$tmp2" \
+            -trim info: \
+            > "$inf"
+        then
+            echo "ERROR: Could not determine trim info from \"$tmp2\"; skipped." >&2
+            rv=1
+            continue
+        fi
+
+        if "$keep_tmpfiles" ; then
+            if ! convert \
+                "$tmp2" \
+                -trim \
+                "$trimmed"
+            then
+                echo "ERROR: Could not test trim \"$tmp2\"; skipped." >&2
+                rv=1
+                continue
+            fi
+        fi
+
+        # upscale crop area from smaller temporary picture sizes
+        crop=$(simplify=$simplify perl -MEnv -e '
+            while(<>) {
+                chomp();
+                s/(\d+)/$1*${simplify}/eg;
+                /(\d+)x(\d+) \d+x\d+\+(\d+)\+(\d+)/ && do {
+                    print $1."x".$2."+".$3."+".$4;
+                }
+            }
+        ' < "$inf")
+
+        if ! "$keep_tmpfiles" ; then
+            if ! rm -f -- "$tmp1" "$tmp2" "$trimmed" "$inf" ; then
+                echo "WARNING: Could not remove temporary files in \"$dir/tmp\"." >&2
+                rv=1
+            fi
+        fi
+
+        echo "Processing $base: crop=$crop ..."
+
+        if ! convert \
+            "$jpg" \
+            -crop "$crop" \
+            -sigmoidal-contrast "$sigmoidal_contrast" \
+            +dither -posterize "$posterize" \
+            "$out"
+        then
+            echo "ERROR: Could not process \"$jpg\"; skipped." >&2
+            rv=1
+            continue
+        fi
+    done
+
+    exit "$rv"
+fi
+
diff --git a/03-pdf.sh b/03-pdf.sh
new file mode 100755
index 0000000..d86c1be
--- /dev/null
+++ b/03-pdf.sh
@@ -0,0 +1,98 @@
+#!/bin/bash
+# shellcheck disable=SC2046
+
+##
+# Configuration
+
+# Paper size of all pages
+paper="a4paper"
+
+# Offset in page where image should be placed
+offset="1cm 3cm"
+
+# Factor to scale image by before placing in page
+scale=1
+
+# Filename of complete result PDF
+result="pdf/result.pdf"
+
+##
+# Main Program
+
+dir="$(dirname "$(readlink -f "$0")")"
+
+if ! cd "$dir" ; then
+    echo "ERROR: Could not change to directory \"$dir\"; aborted." >&2
+    exit 1
+elif ! mkdir -p pdf tmp ; then
+    echo "ERROR: Could not create \"$dir/{pdf,tmp}\"; aborted." >&2
+    exit 1
+elif ! rm -f -- "pdf/"*.* ; then
+    echo "ERROR: Could not delete existing results in \"$dir/pdf\"; aborted." >&2
+    exit 1
+else
+    rv=0
+
+    for png in "out/"*.png ; do
+        echo "INFO: Processing \"$png\" ..." >&2
+
+        read -r width height < <(
+            identify -verbose "$png" | \
+            perl -ne '/Geometry: (\d+)x(\d+)/ && print "$1 $2"'
+        )
+
+        if [[ -z $width ]] || [[ -z $height ]] ; then
+            echo "ERROR: Could not identify width or height of \"$png\"; skipped." >&2
+            rv=1
+            continue
+        elif [[ $width -gt $height ]] ; then
+            backdrop=template/a4paper/landscape.pdf
+            jam_landscape=--landscape
+        else
+            backdrop=template/a4paper/portrait.pdf
+            jam_landscape=--no-landscape
+        fi
+
+        base=$(basename "$png" .png)
+        pdf=tmp/$base.pdf
+        jammed=tmp/$base-pdfjam.pdf
+        backdropped=tmp/$base.backdropped.pdf
+
+        if ! convert "$png" "$pdf" ; then
+            echo "ERROR: Could not convert \"$png\" to PDF; skipped." >&2
+            rv=1
+            continue
+        elif !  pdfjam \
+            --quiet \
+            --outfile tmp \
+            --paper "$paper" \
+            "$jam_landscape" \
+            --scale "$scale" \
+            --offset "$offset" \
+            "$pdf"
+        then
+            echo "ERROR: Could not align \"$pdf\"; skipped." >&2
+            rv=1
+            continue
+        elif ! pdftk \
+            "$jammed" \
+            stamp "$backdrop" \
+            output "$backdropped"
+        then
+            echo "ERROR: Could not watermark \"$pdf\"; skipped." >&2
+            rv=1
+            continue
+        fi
+    done
+
+    if ! pdftk $(ls -- "tmp/"*.backdropped.pdf) cat output "$result" ; then
+        echo "ERROR: Could not concatenate \"$result\"." >&2
+        rv=1
+    elif ! rm -f -- "tmp/"*.pdf ; then
+        echo "ERROR: Could not remove tempfiles in \"$dir/tmp\"." >&2
+        rv=1
+    fi
+
+    exit "$rv"
+fi
+
diff --git a/template/.gitignore b/template/.gitignore
new file mode 100644
index 0000000..644844a
--- /dev/null
+++ b/template/.gitignore
@@ -0,0 +1 @@
+*/*.svg
diff --git a/template/a4paper/landscape.pdf b/template/a4paper/landscape.pdf
new file mode 100644
index 0000000..aca8fce
Binary files /dev/null and b/template/a4paper/landscape.pdf differ
diff --git a/template/a4paper/portrait.pdf b/template/a4paper/portrait.pdf
new file mode 100644
index 0000000..8b071ff
Binary files /dev/null and b/template/a4paper/portrait.pdf differ