diff --git a/Dockerfile b/Dockerfile
index b69b9a6..8b8b7e8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -79,4 +79,4 @@ COPY xsd/*            /usr/share/xml/
 
 
 WORKDIR /data
-CMD ["/usr/bin/my_ocrd_workflow"]
+ENTRYPOINT ["/usr/bin/my_ocrd_workflow"]
diff --git a/my_ocrd_workflow b/my_ocrd_workflow
index 5522fdf..9d380cd 100755
--- a/my_ocrd_workflow
+++ b/my_ocrd_workflow
@@ -6,6 +6,19 @@ set -e  # Abort on error
 export LOG_LEVEL=${LOG_LEVEL:-DEBUG}  # /etc/ocrd_logging.py uses this to set level for all OCR-D modules
 export TEXTEQUIV_LEVEL=glyph
 
+# Command line parameters
+OPTS=`getopt -o I: --long input-file-grp: -- "$@"`
+eval set -- "$OPTS"
+INPUT_FILE_GRP=OCR-D-IMG
+while true; do
+  case "$1" in
+    -I|--input-file-grp) INPUT_FILE_GRP=$2; shift 2;;
+
+    --) shift; break;;
+    *) break;;
+  esac
+done
+
 # Set up logging
 if [ "$LOG_LEVEL" = "DEBUG" -o "$LOG_LEVEL" = "TRACE" ]; then
   set -x
@@ -44,7 +57,7 @@ do_binarization() {
   }'
   ocrd workspace remove-group -rf OCR-D-IMG-BINPAGE
   ocrd workspace remove-group -rf OCR-D-IMG-BIN
-  ocrd-olena-binarize -I OCR-D-IMG -O OCR-D-IMG-BINPAGE,OCR-D-IMG-BIN -p "$ocrd_olena_binarize_parameters"
+  ocrd-olena-binarize -I $INPUT_FILE_GRP -O OCR-D-IMG-BINPAGE,OCR-D-IMG-BIN -p "$ocrd_olena_binarize_parameters"
 }
 
 do_linesegmentation_tesserocr() {
diff --git a/run b/run
index d47dd52..14277a2 100755
--- a/run
+++ b/run
@@ -19,4 +19,4 @@ docker run --privileged=true --rm -t \
   --mount type=bind,src="$(pwd)",target=/data \
   \
   -e LOG_LEVEL=$LOG_LEVEL \
-  $DOCKER_IMAGE
+  $DOCKER_IMAGE "$@"
diff --git a/run-docker-hub b/run-docker-hub
index 9076c93..9e4339e 100755
--- a/run-docker-hub
+++ b/run-docker-hub
@@ -1,4 +1,4 @@
 #!/bin/sh
 # Run the my_ocrd_workflow container on the current workspace
 
-DOCKER_IMAGE=mikegerber/my_ocrd_workflow:stable `dirname $0`/run
+DOCKER_IMAGE=mikegerber/my_ocrd_workflow:stable `dirname $0`/run "$@"