From 0a9055da2df66c80eabfa3ef6d35a90953a5b84d Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Thu, 27 Jul 2023 21:35:24 +0200
Subject: [PATCH] BUG: Handle single element ColorSpace list (#2026)

Fixes #2023
---
 pypdf/filters.py      | 2 ++
 tests/test_filters.py | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/pypdf/filters.py b/pypdf/filters.py
index e6f311529..78e5a9f71 100644
--- a/pypdf/filters.py
+++ b/pypdf/filters.py
@@ -860,6 +860,8 @@ def _handle_jpx(
         data = data.encode()
     colors = x_object_obj.get("/Colors", 1)
     color_space: Any = x_object_obj.get("/ColorSpace", NullObject()).get_object()
+    if isinstance(color_space, list) and len(color_space) == 1:
+        color_space = color_space[0].get_object()
     if (
         IA.COLOR_SPACE in x_object_obj
         and x_object_obj[IA.COLOR_SPACE] == ColorSpaces.DEVICE_RGB
diff --git a/tests/test_filters.py b/tests/test_filters.py
index 76f49430e..86d46bb4d 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -553,3 +553,12 @@ def test_gray_devicen_cmyk():
     diff = ImageChops.difference(data.image, refimg)
     d = sqrt(sum([(a * a) for a in diff.getdata()])) / (diff.size[0] * diff.size[1])
     assert d < 0.001
+
+
+@pytest.mark.enable_socket()
+def test_singleton_device():
+    """From #2023"""
+    url = "https://github.com/py-pdf/pypdf/files/12177287/tt.pdf"
+    name = "pypdf_with_arr_deviceRGB.pdf"
+    reader = PdfReader(BytesIO(get_pdf_from_url(url, name=name)))
+    reader.pages[0].images[0]