ect to a 3D numpy array or memoryviewslice (returns a copy).
This function performs a blur operation on a 3D array, such as an image, and returns a blurred copy.
It supports RGB(A) or other pixel formats, maintaining the original format in the returned array.</p>
<p><strong>Parameters:</strong></p>
<ul class="simple">
<li><p><strong>rgb_array</strong> (numpy.ndarray or memoryviewslice, shape (w, h, n), dtype uint8):
3D array containing pixel data in RGB(A) or any compatible pixel format (e.g., BGRA).
