diff --git a/bin/muxsa-pv b/bin/muxsa-pv
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+++ b/bin/muxsa-pv
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+#!/bin/bash
+
+# muxsa-pv 
+#
+# part of muxsa, https://git-nks-public.tik.uni-stuttgart.de/edu/muxsa
+#
+# this script reads a series of png files (preferably created with
+# muxsa-kvm2png) and creates new png files, with the current file
+# large and the next file somewhat smaller.  The result looks similar
+# to the "presenter view" in slide presentation software.
+
+# MIT License
+# 
+# Copyright (c) 2023 Sebastian Kiesel <sebastian.kiesel@tik.uni-stuttgart.de>
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+
+############################################################################
+
+echo "This is muxsa-pv."
+
+# various parameters can be set as an environment variable (export XX="y z")
+# or can be set in our RC file. Otherwise we will assign default values below.
+
+if [ -r "${HOME}/.muxsarc" ] ; then
+    echo "Found ${HOME}/.muxsarc ... will source it."
+    . "${HOME}/.muxsarc"
+fi
+
+echo "Will work with these settings:"
+echo "MUXSA_KVM2PNG_SLIDE_PREFIX=${MUXSA_KVM2PNG_SLIDE_PREFIX:=""}"
+echo "MUXSA_PV_OUT_DIR=${MUXSA_PV_OUT_DIR:="presenter-view"}"
+echo "MUXSA_PV_RM_OUT_DIR=${MUXSA_PV_RM_OUT_DIR:="0"}"
+echo "MUXSA_PV_SIZE_X=${MUXSA_PV_SIZE_X:="1680"}"
+echo "MUXSA_PV_MARGIN_Y=${MUXSA_PV_MARGIN_Y:="4"}"
+if [ ! "${MUXSA_PV_SIZE_Y}" ] ; then
+    # the left image will be scaled to a width of 64% 
+    # of the width of the output image. assuming an aspect ratio of 16:9, 
+    # its height will be 9/16 * 64% = 36% of that.
+    MUXSA_PV_SIZE_Y=$(( ${MUXSA_PV_SIZE_X} * 36/100 + 2*${MUXSA_PV_MARGIN_Y} ))
+fi
+echo "MUXSA_PV_SIZE_Y=${MUXSA_PV_SIZE_Y}"
+echo
+
+# left image is 64 % of target width, starting at an offset of 1%
+# right image is 32 % of target width, starting at 1+64+2%, leaving 1% right
+X01=$(( ${MUXSA_PV_SIZE_X} * 1 / 100 ))
+X32=$(( ${MUXSA_PV_SIZE_X} * 32 / 100 ))
+X64=$(( ${MUXSA_PV_SIZE_X} * 64 / 100 ))
+X67=$(( ${MUXSA_PV_SIZE_X} * 67 / 100 ))
+
+MAX_Y=$(( ${MUXSA_PV_SIZE_Y} - 2 * ${MUXSA_PV_MARGIN_Y} ))
+
+############################################################################
+
+if [ -e "${MUXSA_PV_OUT_DIR}" ] ; then
+    echo "Output dir ${MUXSA_PV_OUT_DIR} exists."
+    if [ "${MUXSA_PV_RM_OUT_DIR}" = "1" ] ; then
+        echo "Removal requested by MUXSA_PV_RM_OUT_DIR. rm -rf ..."
+        rm -rf "${MUXSA_PV_OUT_DIR}"
+    else
+        echo "Removal NOT requested by MUXSA_PV_RM_OUT_DIR. abort."
+        exit 1
+    fi
+fi
+mkdir -p "${MUXSA_PV_OUT_DIR}"
+if [ ! -d "${MUXSA_PV_OUT_DIR}" ] ; then
+    echo "Could not create output dir ${MUXSA_PV_OUT_DIR}. abort."
+    exit 1
+fi
+
+############################################################################
+
+TMP_FILE_LEFT="$(mktemp -t muxsa-pv-XXXXXXXXXX.ppm)"
+if [ ! -w "${TMP_FILE_LEFT}" ] ; then
+    echo "Error: cannot create tmp_file. abort."
+    exit 1
+fi
+TMP_FILE_RIGHT="$(mktemp -t muxsa-pv-XXXXXXXXXX.ppm)"
+if [ ! -w "${TMP_FILE_RIGHT}" ] ; then
+    rm -f -- "${TMP_FILE_LEFT}"
+    echo "Error: cannot create tmp_file. abort."
+    exit 1
+fi
+trap 'rm -f -- "${TMP_FILE_LEFT}" "${TMP_FILE_RIGHT}"' EXIT
+
+############################################################################
+
+# find . -maxdepth 1 -name "${MUXSA_KVM2PNG_SLIDE_PREFIX}????.png" | sort | \
+# while read RIGHT_FN ; do
+
+for RIGHT_FN in ${MUXSA_KVM2PNG_SLIDE_PREFIX}????.png "" ; do
+    if [ ! -f "${LEFT_FN}" ] ; then
+        LEFT_FN="${RIGHT_FN}"
+        continue
+    fi
+
+    OUTFILE="${MUXSA_PV_OUT_DIR}/${LEFT_FN}"
+    echo "muxsa-pv: processing ${LEFT_FN} + ${RIGHT_FN:-(null)} to ${OUTFILE}"
+
+    pngtopnm "${LEFT_FN}" | \
+        pnmscale -xysize ${X64} ${MAX_Y} | \
+        pnmpad -width ${X64} -height ${MAX_Y} > "${TMP_FILE_LEFT}"
+
+    if [ -f "${RIGHT_FN}" ] ; then
+        pngtopnm "${RIGHT_FN}" | \
+            pnmscale -xysize ${X32} ${MAX_Y} | \
+            pnmpad -width ${X32} -height ${MAX_Y} > "${TMP_FILE_RIGHT}"
+    else
+        pbmmake -black ${X32} ${MAX_Y} > "${TMP_FILE_RIGHT}"
+    fi
+
+    pbmmake -black ${MUXSA_PV_SIZE_X} ${MUXSA_PV_SIZE_Y} | \
+        pnmpaste -replace "${TMP_FILE_LEFT}" ${X01} ${MUXSA_PV_MARGIN_Y} | \
+        pnmpaste -replace "${TMP_FILE_RIGHT}" ${X67} ${MUXSA_PV_MARGIN_Y} | \
+        pnmtopng -force > "${OUTFILE}"
+
+    LEFT_FN="${RIGHT_FN}"
+done
+
+echo "muxsa-pv finished successfully!"
+############################################################################