Add server-side preset fallback for headless/batch execution

Frontend JS syncs preset values into sliders on user interaction,
but headless runners (e.g. Lumi-Batcher) skip the frontend entirely.
When a preset is selected but all sliders are still at defaults,
execute() now applies the preset values server-side as a fallback.

nodes/intervene.py

@@ -447,12 +447,22 @@ def _build_tone_fn(lcs_data, contrast, brightness, saturation, color_temperature
     return post_cfg_fn
 
 
-# Preset names for the combo widget. Actual values live in web/js/tone_preset.js
-# which syncs them into the slider widgets on the frontend.
-TONE_PRESET_NAMES = [
-    "Custom", "Base", "Cinematic", "HDR", "Vivid", "Dramatic",
-    "Low Key", "High Key", "Warm", "Cool", "Desaturated",
-]
+# Preset definitions. Frontend JS (web/js/tone_preset.js) syncs these into
+# sliders on user interaction. The Python-side copy serves as fallback for
+# headless / batch execution where frontend JS does not run.
+TONE_PRESETS = {
+    "Custom":      None,
+    "Base":        {"contrast": 1.0,  "brightness":  0.0,  "saturation": 1.0,  "color_temperature": 0.0},
+    "Cinematic":   {"contrast": 1.20, "brightness": -0.05, "saturation": 0.90, "color_temperature": 0.05},
+    "HDR":         {"contrast": 1.40, "brightness":  0.0,  "saturation": 1.20, "color_temperature": 0.0},
+    "Vivid":       {"contrast": 1.10, "brightness":  0.0,  "saturation": 1.50, "color_temperature": 0.0},
+    "Dramatic":    {"contrast": 1.50, "brightness": -0.10, "saturation": 0.85, "color_temperature": 0.0},
+    "Low Key":     {"contrast": 1.30, "brightness": -0.20, "saturation": 0.80, "color_temperature": 0.0},
+    "High Key":    {"contrast": 0.80, "brightness":  0.20, "saturation": 0.90, "color_temperature": 0.0},
+    "Warm":        {"contrast": 1.0,  "brightness":  0.0,  "saturation": 1.0,  "color_temperature": 0.15},
+    "Cool":        {"contrast": 1.0,  "brightness":  0.0,  "saturation": 1.0,  "color_temperature": -0.15},
+    "Desaturated": {"contrast": 1.0,  "brightness":  0.0,  "saturation": 0.40, "color_temperature": 0.0},
+}
 
 
 class LCSToneAdjust(io.ComfyNode):
@@ -477,7 +487,7 @@ class LCSToneAdjust(io.ComfyNode):
             inputs=[
                 io.Model.Input("model"),
                 LCS_DATA.Input("lcs_data", tooltip="Calibration data from LCSCalibrate or LCSLoadData"),
-                io.Combo.Input("preset", options=TONE_PRESET_NAMES, default="Custom",
+                io.Combo.Input("preset", options=list(TONE_PRESETS.keys()), default="Custom",
                                tooltip="Select a tonal preset or Custom to use the sliders below"),
                 io.Float.Input("contrast", default=1.0, min=0.0, max=3.0, step=0.05,
                                tooltip="Lightness contrast multiplier (>1 = more contrast, <1 = less, 1 = no change)"),
@@ -504,9 +514,18 @@ class LCSToneAdjust(io.ComfyNode):
                 color_temperature, start_step, end_step, mask=None) -> io.NodeOutput:
         """Clone model, attach LCS tone adjustment hook. Returns patched MODEL.
 
-        The preset combo sets slider values via frontend JS; execute() always
-        uses the actual slider values so the user can tweak after selecting a preset.
+        Frontend JS syncs preset values into sliders on user interaction.
+        For headless/batch execution (no frontend), if a preset is selected
+        but sliders are still at defaults, apply the preset values server-side.
         """
+        # Headless fallback: preset selected but sliders untouched → apply preset
+        p = TONE_PRESETS.get(preset)
+        if p is not None and _is_default_tone(contrast, brightness, saturation, color_temperature):
+            contrast = p["contrast"]
+            brightness = p["brightness"]
+            saturation = p["saturation"]
+            color_temperature = p["color_temperature"]
+
         m = model.clone()
         # Skip hook entirely when all parameters are at default (true no-op)
         if not _is_default_tone(contrast, brightness, saturation, color_temperature):

web/js/tone_preset.js

@@ -1,7 +1,8 @@
 import { app } from "../../../scripts/app.js";
 
-// Preset values — the single source of truth for preset parameters.
-// TONE_PRESET_NAMES in nodes/intervene.py must list matching keys.
+// Preset values — must match TONE_PRESETS in nodes/intervene.py.
+// Frontend syncs these into sliders on user interaction; Python has
+// a copy as fallback for headless/batch execution without frontend.
 const TONE_PRESETS = {
     "Base":        { contrast: 1.0,  brightness:  0.0,  saturation: 1.0,  color_temperature: 0.0 },
     "Cinematic":   { contrast: 1.20, brightness: -0.05, saturation: 0.90, color_temperature: 0.05 },