diff --git a/photomap/backend/invokeai_client.py b/photomap/backend/invokeai_client.py
index 3f04a222..bb2a428a 100644
--- a/photomap/backend/invokeai_client.py
+++ b/photomap/backend/invokeai_client.py
@@ -285,7 +285,18 @@ async def fetch_board_image_names(
     The special board id ``"none"`` is InvokeAI's Uncategorized bucket.
     Returned names include their file extension (``{uuid}.png`` style).
     Raises 502 on any network error or non-200 response.
+
+    Canvas intermediates (region masks, staging composites) and
+    control/mask-category assets are excluded, matching what InvokeAI's own
+    gallery shows.  Servers that predate these query params ignore them and
+    return the unfiltered list.
     """
+    # httpx repeats list values (categories=general&categories=user), which
+    # is the encoding FastAPI expects for list[ImageCategory].
+    filter_params = {
+        "is_intermediate": "false",
+        "categories": ["general", "user"],
+    }
     all_names: list[str] = []
     try:
         async with httpx.AsyncClient(timeout=_BOARD_FETCH_TIMEOUT) as client:
@@ -297,7 +308,7 @@ async def fetch_board_image_names(
                 async def _do(
                     headers: dict[str, str], url: str = names_url
                 ) -> httpx.Response:
-                    return await client.get(url, headers=headers)
+                    return await client.get(url, params=filter_params, headers=headers)
 
                 response = await _request_with_auth_fallback(
                     base_url, username, password, _do
diff --git a/tests/backend/test_invokeai_client.py b/tests/backend/test_invokeai_client.py
new file mode 100644
index 00000000..c0c69776
--- /dev/null
+++ b/tests/backend/test_invokeai_client.py
@@ -0,0 +1,77 @@
+"""Tests for the raw HTTP behaviour of ``photomap.backend.invokeai_client``.
+
+The board-index tests (``test_invokeai_board_index.py``) monkeypatch
+``fetch_board_image_names`` wholesale, so the request-building details are
+covered here instead — most importantly that board fetches ask InvokeAI to
+exclude canvas intermediates and mask/control assets, mirroring what the
+InvokeAI gallery itself displays.
+"""
+
+import pytest
+
+from photomap.backend import invokeai_client
+
+
+class _Resp:
+    def __init__(self, status_code=200, json_body=None, text=""):
+        self.status_code = status_code
+        self._json = json_body if json_body is not None else []
+        self.text = text
+
+    def json(self):
+        return self._json
+
+
+class _RecordingClient:
+    """httpx.AsyncClient stub that records each GET and returns scripted responses."""
+
+    def __init__(self, script):
+        self._script = list(script)
+        self.calls: list[dict] = []
+
+    def __call__(self, *args, **kwargs):
+        return self
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, *args):
+        return False
+
+    async def get(self, url, **kwargs):
+        self.calls.append({"url": url, "params": kwargs.get("params")})
+        return self._script.pop(0)
+
+
+@pytest.fixture(autouse=True)
+def _clear_token_cache():
+    invokeai_client._invalidate_token_cache()
+    yield
+    invokeai_client._invalidate_token_cache()
+
+
+@pytest.mark.asyncio
+async def test_fetch_board_image_names_filters_out_intermediates(monkeypatch):
+    """Board fetches must request only non-intermediate general/user images."""
+    stub = _RecordingClient(
+        [
+            _Resp(json_body=["aaa.png", "bbb.png"]),
+            _Resp(json_body=["bbb.png", "ccc.png"]),
+        ]
+    )
+    monkeypatch.setattr(invokeai_client.httpx, "AsyncClient", stub)
+
+    names = await invokeai_client.fetch_board_image_names(
+        "http://localhost:9090", ["board-1", "none"], None, None
+    )
+
+    assert names == ["aaa.png", "bbb.png", "ccc.png"]
+    assert [call["url"] for call in stub.calls] == [
+        "http://localhost:9090/api/v1/boards/board-1/image_names",
+        "http://localhost:9090/api/v1/boards/none/image_names",
+    ]
+    for call in stub.calls:
+        assert call["params"] == {
+            "is_intermediate": "false",
+            "categories": ["general", "user"],
+        }