diff --git a/crates/re_data_ui/src/image.rs b/crates/re_data_ui/src/image.rs
index 4dd25e351a899..aac97e779128d 100644
--- a/crates/re_data_ui/src/image.rs
+++ b/crates/re_data_ui/src/image.rs
@@ -664,7 +664,8 @@ fn tensor_pixel_value_ui(
         ui.label(format!("{x}, {y}"));
         ui.end_row();
 
-        if tensor.num_dim() == 2 {
+        // Check for annotations on any single-channel image
+        if let Some([_, _, 1]) = tensor.image_height_width_channels() {
             if let Some(raw_value) = tensor.get(&[y, x]) {
                 if let (TensorDataMeaning::ClassId, Some(u16_val)) =
                     (meaning, raw_value.try_as_u16())
diff --git a/crates/re_types/src/datatypes/tensor_data_ext.rs b/crates/re_types/src/datatypes/tensor_data_ext.rs
index 80b32eff3f685..c4db01cf74c3a 100644
--- a/crates/re_types/src/datatypes/tensor_data_ext.rs
+++ b/crates/re_types/src/datatypes/tensor_data_ext.rs
@@ -80,8 +80,8 @@ impl TensorData {
                     2 => Some([shape_short[0].size, shape_short[1].size, 1]),
                     3 => {
                         let channels = shape_short[2].size;
-                        if matches!(channels, 3 | 4) {
-                            // rgb, rgba
+                        if matches!(channels, 1 | 3 | 4) {
+                            // mono, rgb, rgba
                             Some([shape_short[0].size, shape_short[1].size, channels])
                         } else {
                             None