diff --git a/custom_components/opendisplay/services.py b/custom_components/opendisplay/services.py
index daa1d74..6ca5651 100644
--- a/custom_components/opendisplay/services.py
+++ b/custom_components/opendisplay/services.py
@@ -136,6 +136,9 @@ def _refresh_type_value(value: Any) -> RefreshMode:
         vol.Optional("rotate", default=0): vol.All(vol.Coerce(int), vol.In([0, 90, 180, 270])),
         vol.Optional("dither", default="ordered"): _dither_value,
         vol.Optional("refresh_type", default="full"): _refresh_type_value,
+        vol.Optional(ATTR_TONE_COMPRESSION): vol.All(
+            vol.Coerce(float), vol.Range(min=0.0, max=100.0)
+        ),
         vol.Optional("dry-run", default=False): cv.boolean,
     },
     extra=vol.REMOVE_EXTRA,  # silently drop legacy keys (ttl, preload_type, preload_lut, ...)
@@ -598,6 +601,10 @@ async def _drawcustom_for_device(
 
     dither_mode: DitherMode = call.data["dither"]
     refresh_mode: RefreshMode = call.data["refresh_type"]
+    tone_compression_pct: float | None = call.data.get(ATTR_TONE_COMPRESSION)
+    tone_compression: float | str = (
+        tone_compression_pct / 100.0 if tone_compression_pct is not None else "auto"
+    )
 
     await _async_send_image(
         hass,
@@ -605,6 +612,7 @@ async def _drawcustom_for_device(
         img,
         dither_mode=dither_mode,
         refresh_mode=refresh_mode,
+        tone=tone_compression,
         rotate=Rotation(rotate),
     )
 
diff --git a/custom_components/opendisplay/services.yaml b/custom_components/opendisplay/services.yaml
index 9db3771..de88a43 100644
--- a/custom_components/opendisplay/services.yaml
+++ b/custom_components/opendisplay/services.yaml
@@ -308,6 +308,17 @@ drawcustom:
           options:
             - "full"
             - "fast"
+    tone_compression:
+      name: Tone compression
+      description: Tone compression strength (0–100%). Omit to use automatic tone mapping.
+      required: false
+      selector:
+        number:
+          min: 0
+          max: 100
+          step: 1
+          mode: slider
+          unit_of_measurement: "%"
     dry-run:
       name: Dry run
       description: Generate image without sending to device