diff --git a/bin/blurborder b/bin/blurborder
new file mode 100755
index 0000000..45862de
--- /dev/null
+++ b/bin/blurborder
@@ -0,0 +1,17 @@
+#!/usr/bin/env sh
+set -e # exit on failure
+IFS=$(printf '\n\t') # smarter ifs
+
+test "$RATIOW" || RATIOW=16
+test "$RATIOH" || RATIOH=9
+imageh=$(identify -format %h "$1")
+des_ratio=$(printf '3 k %u %u / p' "$RATIOW" "$RATIOH" | dc)
+des_width=$(printf '1 k %f %u * p' "$des_ratio" "$imageh" | dc | cut -d. -f1)
+
+convert "$1" -blur 0x7 -resize "$des_width"x tmp1.ppm
+convert "$1" -bordercolor black -border 10x0 tmp2.ppm
+composite -gravity center tmp2.ppm tmp1.ppm tmp3.ppm
+mogrify -gravity center -crop "x$imageh+0" tmp3.ppm
+outfile="$(dirname "$1")/tran_$(basename "$1" | tuc -d. -f:-2).jxl"
+cjxl -e 8 tmp3.ppm "$outfile"
+rm tmp*.ppm