From 55d8283b3e14eb595ac6785813fa7d2f0311b783 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Wed, 15 Nov 2023 11:06:38 +1100
Subject: [PATCH] Pad PDF palette to 256 entries when saving

---
 src/PIL/PdfImagePlugin.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/PIL/PdfImagePlugin.py b/src/PIL/PdfImagePlugin.py
index 09fc0c7e6ce..bf5f637fda3 100644
--- a/src/PIL/PdfImagePlugin.py
+++ b/src/PIL/PdfImagePlugin.py
@@ -93,6 +93,7 @@ def _write_image(im, filename, existing_pdf, image_refs):
     elif im.mode == "P":
         filter = "ASCIIHexDecode"
         palette = im.getpalette()
+        palette += (768 - len(palette)) * [0]
         dict_obj["ColorSpace"] = [
             PdfParser.PdfName("Indexed"),
             PdfParser.PdfName("DeviceRGB"),