Settings background (background_holo_dark) topic

[Using Android 4.3.1 (CM10.2) on a Galaxy Nexus]

I'm attempting to replace the stock gradient background of the settings menu. I was able to get it to show all black instead of the gradient but I can't seem to get it to show a PNG image.

This is what is found in the /res/drawable/background_holo_dark.xml file

Original gradient:

Code:

---

<shape
xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:startColor="#ff000000" android:endColor="#ff272d33" android:angle="270.0" />
</shape>

---

Black background:

Code:

---

<?xml version="1.0" encoding="utf-8"?>
<shape
  xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@color/black" />
</shape>

---

Attempt at using a PNG image (image placed in /drawable-nodpi/background_holo_dark.png) courtesy of this thread

Code:

---

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical" android:background="@drawable/background_holo_dark">
</LinearLayout>

---

Using the above code to use an image as the background causes settings to force close. When I open Root Browser (which uses background_holo_dark.xml) it says something along the lines of "size of image too large".

Anyone know why the code fails?