bugfix

src/spatialdata_plot/pl/render.py

@@ -936,7 +936,7 @@ def _render_images(
 
                     # For each channel: map to RGBA, apply constant alpha, then add
                     for idx, ch in enumerate(channels):
-                        layer_arr = layers[ch]
+                        layer_arr = layers[idx]
                         rgba = channel_cmaps[idx](layer_arr)
                         rgba[..., 3] = render_params.alpha
                         comp_rgb += rgba[..., :3] * rgba[..., 3][..., None]

tests/pl/test_render_images.py

@@ -175,8 +175,7 @@ def test_plot_can_handle_multiple_cmaps(self, sdata_blobs: SpatialData):
         ).pl.show()
 
 
-def test_fails_with_palette_and_multiple_cmaps(self, sdata_blobs: SpatialData):
-    """Test error case: Cannot provide both palette and multiple cmaps"""
+def test_fails_with_palette_and_multiple_cmaps(sdata_blobs: SpatialData):
     with pytest.raises(ValueError, match="If 'palette' is provided"):
         sdata_blobs.pl.render_images(
             element="blobs_image",
@@ -212,5 +211,5 @@ def test_fail_invalid_multichannel_strategy(sdata_multichannel):
 
 
 def test_fail_channel_index_out_of_range(sdata_blobs):
-    with pytest.raises(ValueError, match="Invalid channel(s): 10. Valid choices are: [0, 1, 2]"):
+    with pytest.raises(ValueError, match="Invalid channel"):
         sdata_blobs.pl.render_images(element="blobs_image", channel=10).pl.show()