fix(v5): default fft spectrum to log magnitude

backend/processing/services.py

@@ -223,15 +223,12 @@ def image_state_fft_spectrum_create(*, state, params):
     """
 
     source = load_image_array(state.image)
-    mode = params.get("mode", "log_magnitude")
-    if mode not in {"magnitude", "log_magnitude", "phase"}:
-        raise ProcessingError("FFT mode must be magnitude, log_magnitude, or phase.")
     spectrum = image_fft(source)
-    preview = fft_preview_image(spectrum, mode)
+    preview = fft_preview_image(spectrum)
     fft_data_path = save_fft_array(spectrum, "state-fft-data")
     operation_params = {
-        **params,
-        "mode": mode,
+        **(params or {}),
+        "mode": "log_magnitude",
         "fft_data_path": fft_data_path,
         "source_state_id": str(state.id),
         "source_color_mode": "RGB" if source.ndim == 3 else "L",
@@ -276,15 +273,10 @@ def image_fft(image):
     return np.stack(channels, axis=2)
 
 
-def fft_preview_image(spectrum, mode):
-    """Convert complex FFT data to a display-only uint8 preview image."""
+def fft_preview_image(spectrum):
+    """Convert complex FFT data to a display-only log-magnitude uint8 preview image."""
 
-    if mode == "phase":
-        preview = np.angle(spectrum)
-    else:
-        preview = np.abs(spectrum)
-        if mode == "log_magnitude":
-            preview = np.log1p(preview)
+    preview = np.log1p(np.abs(spectrum))
     return normalize_to_uint8(preview)