Simplify dependencies in Dockerfile.

utils/multires/Dockerfile

@@ -1,19 +1,11 @@
 FROM ubuntu:18.04
 
 # docker build -t generate-panorama .
-# docker run -it -v $PWD:/data generate-panorama /data/image.png
+# docker run -it -v $PWD:/data generate-panorama /data/image.jpg
 
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && \
-    apt-get install -y python3 python3-dev software-properties-common && \
-    add-apt-repository ppa:ubuntuhandbook1/apps && \
-    apt-get update && \
-    apt-get install -y hugin
-
-RUN apt-get install -y wget && \
-    wget https://bootstrap.pypa.io/get-pip.py && \
-    python3 get-pip.py && \
-    pip3 install Pillow
+    apt-get install -y python3 python3-pil hugin-tools
 
 ADD generate.py /generate.py
 ENTRYPOINT ["python3", "/generate.py"]