From 8483429c5c63cdf1d67b4b6d4fbdee6a95852f09 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <m@m-chrzan.xyz>
Date: Tue, 26 May 2026 18:25:03 +0200
Subject: Add pdf operations

---
 pdf.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pdf.md b/pdf.md
index f13af21..7cc5cf0 100644
--- a/pdf.md
+++ b/pdf.md
@@ -4,6 +4,11 @@
 
     gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=out.pdf in1.pdf in2.pdf
 
+GhostScript uses some algorithm to autodetect page orientation, and may
+undersireably flip some pages. To disable this, add:
+
+    "-dAutoRotatePages=/None"
+
 ## Compress
 
     gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/default -dNOPAUSE -dQUIET -dBATCH -dDetectDuplicateImages -dCompressFonts=true -r150 -sOutputFile=output.pdf input.pdf
@@ -12,6 +17,10 @@
 
     pdfjam --outfile out.pdf in.pdf 1,3,4-7
 
+`--landscape` to set orientation of output pages.
+
+`--angle <angle>` to rotate (counter clockwise).
+
 ## Images to pdf
 
     convert in1.jpg in2.jpg out.pdf
-- 
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