diff --git a/media/extollo/README.md b/media/extollo/README.md
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+++ b/media/extollo/README.md
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+# Extollo
+
+This script applies a LUT onto a image/movie file.
+
+## How to use
+
+Pass a target file to the runner with a given LUT file:
+
+```bash
+extollo/runner.sh -l path/to/lut.cube path/to/file.mp4 path/to/file.jpg
+```
diff --git a/media/extollo/runner.sh b/media/extollo/runner.sh
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+++ b/media/extollo/runner.sh
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+#!/bin/bash
+
+# auxiliary functions
+
+function help() {
+	echo -e "Usage:\n\t$(basename "$0") -l <path/to/lut> <path>"
+}
+
+# shell setup
+
+set -euo pipefail
+
+# arguments parsing
+
+LUT=""
+TARGETS=()
+
+while [[ $# -gt 0 ]]; do
+	case "$1" in
+	-h | --help)
+		help
+		exit 0
+		;;
+	-l | --lut)
+		LUT="$2"
+		shift || echo -n
+		;;
+	*)
+		TARGETS+=("$1")
+		;;
+	esac
+	shift || echo -n
+done
+
+# arguments validation
+
+if [ -z "${LUT}" ]; then
+	echo "A LUT file must be provided"
+	exit 1
+fi
+
+# effective script
+
+for fname in "${TARGETS[@]}"; do
+	fname_ext="$(echo "${fname##*.}" | tr '[:upper:]' '[:lower:]' | sed 's/jpeg/jpg/g')"
+	fname_tmp="/tmp/$(basename "${fname}").$$.${fname_ext}"
+
+	if [ "${fname_ext}" == "jpg" ]; then
+		gmic "${fname}" "${LUT}" 'map_clut[0]' '[1]' 'o[0]' "${fname_tmp}"
+	elif [ "${fname_ext}" == "mp4" ]; then
+		ffmpeg -nostdin -i "${fname}" -vf "lut3d=${LUT},mpdecimate,transpose=2" -c:v libx265 -vtag hvc1 -pix_fmt:v yuv420p -y "${fname_tmp}"
+	else
+		echo "Unsupported format ${fname_ext} at ${fname}"
+		exit 1
+	fi
+
+	mv -vf "${fname_tmp}" "${fname}"
+done