1 files changed, 56 insertions, 0 deletions
diff --git a/cli/pdf-compress.sh b/cli/pdf-compress.sh
new file mode 100755
index 0000000..9f68c4c
--- /dev/null
+++ b/cli/pdf-compress.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+#
+# Shrink the size of PDF files by adjust its quality using `gs` (GhostScript).
+#
+# Aaron LI
+# 2013/09/18
+#
+
+case "$1" in
+    -[hH]*|--[hH]*)
+        printf "usage:\n"
+        printf "    `basename $0` in=<input.pdf> out=<output.pdf> quality=<screen|ebook|printer|prepress> imgdpi=<img_dpi>\n"
+        exit 1
+        ;;
+esac
+
+getopt_keyval() {
+    until [ -z "$1" ]
+    do
+        key=${1%%=*}                    # extract key
+        val=${1#*=}                     # extract value
+        keyval="${key}=\"${val}\""
+        echo "## getopt: eval '${keyval}'"
+        eval ${keyval}
+        shift                           # shift, process next one
+    done
+}
+getopt_keyval "$@"
+
+if [ -z "${in}" ] || [ -z "${out}" ]; then
+    printf "Error: 'in' or 'out' not specified\n"
+    exit 2
+fi
+quality=${quality:-ebook}
+imgdpi=${imgdpi:-120}
+
+printf "# in: ${in}
+# out: ${out}
+# quality: ${quality}
+# imgdpi: ${imgdpi}\n"
+
+gs  -dNOPAUSE -dBATCH -dSAFER \
+    -sDEVICE=pdfwrite \
+    -dCompatibilityLevel=1.4 \
+    -dPDFSETTINGS="/${quality}" \
+    -dEmbedAllFonts=true \
+    -dSubsetFonts=true \
+    -dColorImageDownsampleType=/Bicubic \
+    -dColorImageResolution=${imgdpi} \
+    -dGrayImageDownsampleType=/Bicubic \
+    -dGrayImageResolution=${imgdpi} \
+    -dMonoImageDownsampleType=/Bicubic \
+    -dMonoImageResolution=${imgdpi} \
+    -sOutputFile=${out} \
+    ${in}
+