feat: add ImageGridSlice node

Slices an image into a rows x columns grid (max 16x16), returning all
tiles as a single IMAGE batch in row-major order. Uses uniform floor-
sized cells so tiles stack into one tensor.

comfy_extras/nodes_images.py

@@ -1240,6 +1240,54 @@ class SaveImageAdvanced(IO.ComfyNode):
         return IO.NodeOutput(ui={"images": results})
 
 
+class ImageGridSlice(IO.ComfyNode):
+    MAX_ROWS = 16
+    MAX_COLUMNS = 16
+
+    @classmethod
+    def define_schema(cls):
+        return IO.Schema(
+            node_id="ImageGridSlice",
+            display_name="Image Grid Slice",
+            category="image/transform",
+            search_aliases=["grid", "slice image", "split image", "crop grid"],
+            description="Slices an image into a grid of rows x columns tiles, returned as a single batch (row-major).",
+            inputs=[
+                IO.Image.Input("image"),
+                IO.Int.Input("rows", default=2, min=1, max=cls.MAX_ROWS),
+                IO.Int.Input("columns", default=2, min=1, max=cls.MAX_COLUMNS),
+            ],
+            outputs=[
+                IO.Image.Output(display_name="images"),
+            ],
+        )
+
+    @classmethod
+    def execute(cls, image, rows, columns) -> IO.NodeOutput:
+        rows = max(1, min(rows, cls.MAX_ROWS))
+        columns = max(1, min(columns, cls.MAX_COLUMNS))
+
+        _, height, width, _ = image.shape
+        tile_height = height // rows
+        tile_width = width // columns
+
+        tiles = []
+        for row in range(rows):
+            y_start = row * tile_height
+            for col in range(columns):
+                x_start = col * tile_width
+                tiles.append(
+                    image[
+                        :,
+                        y_start:y_start + tile_height,
+                        x_start:x_start + tile_width,
+                        :,
+                    ]
+                )
+
+        return IO.NodeOutput(torch.cat(tiles, dim=0))
+
+
 class ImagesExtension(ComfyExtension):
     @override
     async def get_node_list(self) -> list[type[IO.ComfyNode]]:
@@ -1262,6 +1310,7 @@ class ImagesExtension(ComfyExtension):
             ImageScaleToMaxDimension,
             SplitImageToTileList,
             ImageMergeTileList,
+            ImageGridSlice,
         ]