From cf80180f2d29339050da189957cbec5d67eb28fb Mon Sep 17 00:00:00 2001
From: "mb@ts" <mail@manettaberends.nl>
Date: Thu, 9 Jun 2022 11:34:24 +0200
Subject: [PATCH] adding resample to the toolbox

---
 command-line/tools/README.md   | 12 ++++++++++++
 command-line/tools/resample.sh | 18 ++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100755 command-line/tools/resample.sh

diff --git a/command-line/tools/README.md b/command-line/tools/README.md
index dce583b..86b2548 100644
--- a/command-line/tools/README.md
+++ b/command-line/tools/README.md
@@ -34,6 +34,18 @@ Usage:
 
 Link: <http://osp.kitchen/tools/pdfutils/>
 
+## OSP-tools: `resample.sh`
+
+Dependencies:
+
+- `gs` (Ghostscript)
+
+This will change the resolution of a PDF.
+
+Usage:
+
+    ./resample input.pdf 150
+
 ## Custom VR tools: `make-images-bw.sh`
 
 Dependencies:
diff --git a/command-line/tools/resample.sh b/command-line/tools/resample.sh
new file mode 100755
index 0000000..28f4270
--- /dev/null
+++ b/command-line/tools/resample.sh
@@ -0,0 +1,18 @@
+#! /bin/bash
+
+pdffile=$1;
+dpi=$2
+
+gs \
+  -o "${pdffile%.pdf}-resampled.pdf" \
+  -sDEVICE=pdfwrite \
+  -dDownsampleColorImages=true \
+  -dDownsampleGrayImages=true \
+  -dDownsampleMonoImages=true \
+  -dColorImageResolution=$dpi \
+  -dGrayImageResolution=$dpi \
+  -dMonoImageResolution=$dpi \
+  -dColorImageDownsampleThreshold=1.0 \
+  -dGrayImageDownsampleThreshold=1.0 \
+  -dMonoImageDownsampleThreshold=1.0 \
+   "${pdffile}"