Add RGB support to plot_array and unit test

`plot_array` now detects 3- or 4-channel arrays and skips colormap,
norm, and colorbar — all of which are inappropriate for RGB images.
A `test__plot_array_rgb` unit test covers the new code path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

autoarray/plot/array.py

@@ -133,6 +133,8 @@ def plot_array(
     if array is None or array.size == 0:
         return
 
+    is_rgb = array.ndim == 3 and array.shape[2] in (3, 4)
+
     if colormap is None:
         from autoarray.plot.utils import _default_colormap
         colormap = _default_colormap()
@@ -194,21 +196,30 @@ def plot_array(
         h, w = array.shape[:2]
         _box_aspect = (w / h) if h > 0 else 1.0
 
-    im = ax.imshow(
-        array,
-        cmap=colormap,
-        norm=norm,
-        extent=extent,
-        aspect="auto",  # image fills the axes box; box shape set below
-        origin=origin_imshow,
-    )
+    if is_rgb:
+        im = ax.imshow(
+            array,
+            extent=extent,
+            aspect="auto",
+            origin=origin_imshow,
+        )
+    else:
+        im = ax.imshow(
+            array,
+            cmap=colormap,
+            norm=norm,
+            extent=extent,
+            aspect="auto",  # image fills the axes box; box shape set below
+            origin=origin_imshow,
+        )
 
     # Shape the axes box to match the data so there is no surrounding
     # whitespace when the panel is embedded in a subplot grid.
     ax.set_aspect(_box_aspect, adjustable="box")
 
-    from autoarray.plot.utils import _apply_colorbar
-    _apply_colorbar(im, ax, cb_unit=cb_unit, is_subplot=not owns_figure)
+    if not is_rgb:
+        from autoarray.plot.utils import _apply_colorbar
+        _apply_colorbar(im, ax, cb_unit=cb_unit, is_subplot=not owns_figure)
 
     # --- overlays --------------------------------------------------------------
     if array_overlay is not None:

test_autoarray/structures/plot/test_structure_plotters.py

@@ -145,3 +145,24 @@ def test__array_rgb(
     )
 
     assert path.join(plot_path, "array_rgb.png") in plot_patch.paths
+
+
+def test__plot_array_rgb(
+    array_2d_rgb_7x7,
+    plot_path,
+    plot_patch,
+):
+    """
+    `plot_array` (the high-level function) must handle `Array2DRGB` inputs without
+    applying a colormap, norm, or colorbar — all of which would raise errors or
+    produce nonsense for a 3-channel image.
+    """
+    aplt.plot_array(
+        array=array_2d_rgb_7x7,
+        title="RGB Test",
+        output_path=plot_path,
+        output_filename="array_rgb_high_level",
+        output_format="png",
+    )
+
+    assert path.join(plot_path, "array_rgb_high_level.png") in plot_patch.paths