From 1f182ce8da03b375986c6bdf78f1337e3872bd0b Mon Sep 17 00:00:00 2001
From: scaramallion <scaramallion@users.noreply.github.com>
Date: Mon, 25 Mar 2024 17:39:21 +1100
Subject: [PATCH] Fix parsing the J2K header

---
 src/PIL/Jpeg2KImagePlugin.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/PIL/Jpeg2KImagePlugin.py b/src/PIL/Jpeg2KImagePlugin.py
index 925a9148c..d5734feac 100644
--- a/src/PIL/Jpeg2KImagePlugin.py
+++ b/src/PIL/Jpeg2KImagePlugin.py
@@ -110,11 +110,11 @@ def _parse_codestream(fp):
     xrsiz = [None] * csiz
     yrsiz = [None] * csiz
     for i in range(csiz):
-        ssiz[i], xrsiz[i], yrsiz[i] = struct.unpack_from(">BBB", siz, 36 + 3 * i)
+        ssiz[i], xrsiz[i], yrsiz[i] = struct.unpack_from(">BBB", siz, 38 + 3 * i)
 
     size = (xsiz - xosiz, ysiz - yosiz)
     if csiz == 1:
-        if (yrsiz[0] & 0x7F) + 1 > 8:
+        if (ssiz[0] & 0x7F) + 1 > 8:
             mode = "I;16"
         else:
             mode = "L"