diff --git a/README.md b/README.md
index 61c56c9..46ff3a5 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,10 @@ We also provide some utility scripts for working with `PDF`, `PS`, and `EPS` fil
 
 - `eps2pdf.sh <document>` convert the `EPS` file `<document>` to `PDF`
 - `filterPdf.sh <document>` transform a document (either in [PostScript](https://en.wikipedia.org/wiki/PostScript)/`PS`, `EPS`, or `PDF` format) to `PDF` and include as many of the fonts used inside the document into the final `PDF`. This allows to produce a `PDF` from a `.ps` file `<document>` which should display correctly on as many computers as possible. 
+- `filterPdfExact.sh <document>` does the same as `filderPdf.sh`, except that it does not re-encode the included images.
 - `sudo` is a pseudo-`sudo` command: Inside a Docker container, we don't need `sudo`. However, if you have a script or something that calls plain `sudo` (without additional arguments) just with a to-be-sudoed command, this script will emulate a `sudo`. By doing nothing.
+- `downscalePdf.sh <document> {resolution}` makes a pdf document smaller by downscaling all included images (to the specified resolution).
+- `findNonASCIIChars.sh <document>` finds non-ASCII characters in a document. In `.tex` documents, such characters may pose problems.
 
 ## 4. License
 
diff --git a/image/Dockerfile b/image/Dockerfile
index 5ef92d9..25505c5 100644
--- a/image/Dockerfile
+++ b/image/Dockerfile
@@ -45,8 +45,8 @@ RUN export LANG=C.UTF-8 &&\
                           texlive-science=2015.2016* \
                           texlive-xetex=2015.2016* &&\
 # install pandoc
-    apt-get install -f -y pandoc \
-                          pandoc-citeproc &&\
+    apt-get install -f -y pandoc=1.16*\
+                          pandoc-citeproc=0.9* &&\
 # free huge amount of unused space
     apt-get purge -f -y make-doc \
                         texlive-fonts-extra-doc \
diff --git a/image/scripts/downscalePdf.sh b/image/scripts/downscalePdf.sh
new file mode 100644
index 0000000..5d001e1
--- /dev/null
+++ b/image/scripts/downscalePdf.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+
+# Make a pdf File Smaller by downscaling all included images
+
+# strict error handling
+set -o pipefail  # trace ERR through pipes
+set -o errtrace  # trace ERR through 'time command' and other functions
+set -o nounset   # set -u : exit the script if you try to use an uninitialized variable
+set -o errexit   # set -e : exit the script if any statement returns a non-true return value
+
+
+echo "Make a pdf File Smaller by downscaling all included images."
+
+source="$1"
+name="${source%%.*}"
+dest="$name.pdf"
+
+if [ -f "$dest" ]; then
+  useSource="$name.original.pdf"
+  echo "Creating backup '$useSource' of '$dest'."
+  cp "$dest" "$useSource"
+else
+  useSource="$source"
+fi
+
+resolution=${2:-}
+
+if [[ -n "$resolution" ]]
+then
+  echo "The resolution '$resolution' was specified."
+else
+resolution=192
+  echo "No resolution was specified, using '$resolution'."
+fi
+
+echo "Downscaling '$useSource' to '$dest'."
+
+gs -q -dEmbedAllFonts=true -dSubsetFonts=true -dCompressFonts=true \
+  -dOptimize=true \
+  -dPreserveCopyPage=false -dPreserveEPSInfo=false -dPreserveHalftoneInfo=false \
+  -dPreserveOPIComments=false -dPreserveOverprintSettings=false \
+  -dPreserveSeparation=false -dPreserveDeviceN=false \
+  -dMaxBitmap=2147483647 \
+  -dDownsampleMonoImages=true -dDownsampleGrayImages=true -dDownsampleColorImages=true \
+  -dColorImageDownsampleType=/Bicubic -dGrayImageDownsampleType=/Bicubic \
+  -dMonoImageDownsampleType=/Bicubic \
+  -dColorImageResolution=$resolution -dGrayImageResolution=$resolution -dMonoImageResolution=$resolution \
+  -dFastWebView=false \
+  -dNOPAUSE -dQUIET -dBATCH -dSAFER -sDEVICE=pdfwrite -dAutoRotatePages=/PageByPage \
+  -sOutputFile="$dest" "$useSource" \
+  -c .setpdfwrite "<</NeverEmbed [ ]>> setdistillerparams"
+
+
+chmod 777 "$dest" || true
+
+echo "Finished creating downsampled, smaller version."
+
diff --git a/image/scripts/filterPdfExact.sh b/image/scripts/filterPdfExact.sh
new file mode 100644
index 0000000..4759ef0
--- /dev/null
+++ b/image/scripts/filterPdfExact.sh
@@ -0,0 +1,15 @@
+#!/bin/bash -
+
+# This script filters a PDF file and attempts to include
+# as many fonts as possible. It works like filterPdf, but
+# avoids image re-encoding.
+
+# strict error handling
+set -o pipefail  # trace ERR through pipes
+set -o errtrace  # trace ERR through 'time command' and other functions
+set -o nounset   # set -u : exit the script if you try to use an uninitialized variable
+set -o errexit   # set -e : exit the script if any statement returns a non-true return value
+
+scriptDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+"$scriptDir/__filterPdf.sh" "$1" "-dAutoFilterColorImages=false -dAutoFilterGrayImages=false -dColorImageFilter=/FlateEncode -dGrayImageFilter=/FlateEncode -dColorConversionStrategy=/LeaveColorUnchanged"
diff --git a/image/scripts/findNonASCIIChars.sh b/image/scripts/findNonASCIIChars.sh
new file mode 100644
index 0000000..955ed89
--- /dev/null
+++ b/image/scripts/findNonASCIIChars.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# strict error handling
+set -o pipefail  # trace ERR through pipes
+set -o errtrace  # trace ERR through 'time command' and other functions
+set -o nounset   # set -u : exit the script if you try to use an uninitialized variable
+set -o errexit   # set -e : exit the script if any statement returns a non-true return value
+
+# Find non-ASCII characters which may cause problems in tex documents.
+grep --color='auto' -P -n '[^\x00-\x7F]' "$1"