diff --git a/src/config.h b/src/config.h
index 8d0ac180cf..987d33a577 100644
--- a/src/config.h
+++ b/src/config.h
@@ -142,6 +142,9 @@ struct window_maybe_options {
 	/// Window opacity, NaN means not set.
 	double opacity;
 
+	/// Window dim level, NaN means not set.
+	double dim;
+
 	/// Name of the custom fragment shader for this window. NULL means not set.
 	const struct shader_info *shader;
 
@@ -153,8 +156,6 @@ struct window_maybe_options {
 	enum tristate invert_color;
 	/// Whether to blur window background.
 	enum tristate blur_background;
-	/// Whether the window is to be dimmed.
-	enum tristate dim;
 	/// Whether this window should fade.
 	enum tristate fade;
 	/// Do not paint shadow over this window.
@@ -168,13 +169,13 @@ struct window_maybe_options {
 /// Like `window_maybe_options`, but all fields are guaranteed to be set.
 struct window_options {
 	double opacity;
+	double dim;
 	const struct shader_info *shader;
 	unsigned int corner_radius;
 	bool transparent_clipping;
 	bool shadow;
 	bool invert_color;
 	bool blur_background;
-	bool dim;
 	bool fade;
 	bool clip_shadow_above;
 	bool paint;
@@ -188,7 +189,7 @@ win_options_eq(const struct window_options *a, const struct window_options *b) {
 	return memcmp(a, b, offsetof(struct window_options, padding)) == 0;
 }
 
-static_assert(offsetof(struct window_options, padding) == 29, "window_options has "
+static_assert(offsetof(struct window_options, padding) == 36, "window_options has "
                                                               "implicit padding");
 
 extern struct shader_info null_shader;
diff --git a/src/picom.c b/src/picom.c
index fdd2c70481..65c25c9a86 100644
--- a/src/picom.c
+++ b/src/picom.c
@@ -1824,12 +1824,11 @@ static void draw_callback_impl(EV_P_ session_t *ps, int revents attr_unused) {
 			    ps->layout_manager, ps->wm, ps->root_image_generation,
 			    (ivec2){.width = ps->root_width, .height = ps->root_height});
 			bool succeeded = renderer_render(
-			    ps->renderer, ps->backend_data, ps->root_image,
-			    ps->layout_manager, ps->command_builder,
-			    ps->backend_blur_context, render_start_us, ps->sync_fence,
-			    ps->o.use_damage, ps->o.monitor_repaint, ps->o.force_win_blend,
-			    ps->o.blur_background_frame, ps->o.inactive_dim_fixed,
-			    ps->o.max_brightness, ps->o.inactive_dim,
+			    ps->renderer, ps->backend_data, ps->root_image, ps->layout_manager,
+			    ps->command_builder, ps->backend_blur_context, render_start_us,
+			    ps->sync_fence, ps->o.use_damage, ps->o.monitor_repaint,
+			    ps->o.force_win_blend, ps->o.blur_background_frame,
+			    ps->o.inactive_dim_fixed, ps->o.max_brightness,
 			    ps->o.crop_shadow_to_monitor ? &ps->monitors : NULL,
 			    ps->o.wintype_option, &after_damage_us);
 			if (!succeeded) {
diff --git a/src/render.c b/src/render.c
index 2b3c87a60c..843b3bfd5b 100644
--- a/src/render.c
+++ b/src/render.c
@@ -561,8 +561,8 @@ void paint_one(session_t *ps, struct win *w, const struct window_options *w_opts
 	}
 
 	// Dimming the window if needed
-	if (w_opts->dim) {
-		double dim_opacity = ps->o.inactive_dim;
+	if (w_opts->dim > 0) {
+		double dim_opacity = w_opts->dim;
 		if (!ps->o.inactive_dim_fixed) {
 			dim_opacity *= window_opacity;
 		}
diff --git a/src/renderer/command_builder.c b/src/renderer/command_builder.c
index c12df7b40b..257e9454df 100644
--- a/src/renderer/command_builder.c
+++ b/src/renderer/command_builder.c
@@ -17,17 +17,14 @@
 static inline unsigned
 commands_for_window_body(struct layer *layer, struct backend_command *cmd,
                          const region_t *frame_region, bool inactive_dim_fixed,
-                         double inactive_dim, double max_brightness) {
+                         double max_brightness) {
 	auto w = layer->win;
 	scoped_region_t crop = region_from_box(layer->crop);
 	auto mode = win_calc_mode_raw(layer->win);
 	int border_width = w->g.border_width;
-	double dim = 0;
-	if (layer->options.dim) {
-		dim = inactive_dim;
-		if (!inactive_dim_fixed) {
-			dim *= layer->opacity;
-		}
+	double dim = layer->options.dim;
+	if (!inactive_dim_fixed) {
+		dim *= layer->opacity;
 	}
 	if (border_width == 0) {
 		// Some WM has borders implemented as WM frames
@@ -363,9 +360,9 @@ void command_builder_free(struct command_builder *cb) {
 
 // TODO(yshui) reduce the number of parameters by storing the final effective parameter
 // value in `struct managed_win`.
-void command_builder_build(struct command_builder *cb, struct layout *layout, bool force_blend,
-                           bool blur_frame, bool inactive_dim_fixed, double max_brightness,
-                           double inactive_dim, const struct x_monitors *monitors,
+void command_builder_build(struct command_builder *cb, struct layout *layout,
+                           bool force_blend, bool blur_frame, bool inactive_dim_fixed,
+                           double max_brightness, const struct x_monitors *monitors,
                            const struct win_option *wintype_options) {
 
 	unsigned ncmds = 1;
@@ -398,8 +395,8 @@ void command_builder_build(struct command_builder *cb, struct layout *layout, bo
 		                          layer->window.origin.y);
 
 		// Add window body
-		cmd -= commands_for_window_body(layer, cmd, &frame_region, inactive_dim_fixed,
-		                                inactive_dim, max_brightness);
+		cmd -= commands_for_window_body(layer, cmd, &frame_region,
+		                                inactive_dim_fixed, max_brightness);
 
 		// Add shadow
 		cmd -= command_for_shadow(layer, cmd, wintype_options, monitors, last + 1);
diff --git a/src/renderer/command_builder.h b/src/renderer/command_builder.h
index a8c9c24e1e..f003d60e04 100644
--- a/src/renderer/command_builder.h
+++ b/src/renderer/command_builder.h
@@ -23,7 +23,7 @@ void command_builder_command_list_free(struct backend_command *cmds);
 /// It is guaranteed that each of the command's region of operation (e.g. the mask.region
 /// argument of blit), will be store in `struct backend_command::mask`. This might not
 /// stay true after further passes.
-void command_builder_build(struct command_builder *cb, struct layout *layout, bool force_blend,
-                           bool blur_frame, bool inactive_dim_fixed, double max_brightness,
-                           double inactive_dim, const struct x_monitors *monitors,
+void command_builder_build(struct command_builder *cb, struct layout *layout,
+                           bool force_blend, bool blur_frame, bool inactive_dim_fixed,
+                           double max_brightness, const struct x_monitors *monitors,
                            const struct win_option *wintype_options);
diff --git a/src/renderer/renderer.c b/src/renderer/renderer.c
index ca38f93a8c..dacd14923c 100644
--- a/src/renderer/renderer.c
+++ b/src/renderer/renderer.c
@@ -486,11 +486,10 @@ void renderer_ensure_images_ready(struct renderer *r, struct backend_base *backe
 /// @return true if a frame is rendered, false if this frame is skipped.
 bool renderer_render(struct renderer *r, struct backend_base *backend,
                      image_handle root_image, struct layout_manager *lm,
-                     struct command_builder *cb, void *blur_context,
-                     uint64_t render_start_us, xcb_sync_fence_t xsync_fence,
-                     bool use_damage, bool monitor_repaint, bool force_blend,
-                     bool blur_frame, bool inactive_dim_fixed, double max_brightness,
-                     double inactive_dim, const struct x_monitors *monitors,
+                     struct command_builder *cb, void *blur_context, uint64_t render_start_us,
+                     xcb_sync_fence_t xsync_fence, bool use_damage, bool monitor_repaint,
+                     bool force_blend, bool blur_frame, bool inactive_dim_fixed,
+                     double max_brightness, const struct x_monitors *monitors,
                      const struct win_option *wintype_options, uint64_t *after_damage_us) {
 	if (xsync_fence != XCB_NONE) {
 		// Trigger the fence but don't immediately wait on it. Let it run
@@ -512,7 +511,7 @@ bool renderer_render(struct renderer *r, struct backend_base *backend,
 	renderer_ensure_images_ready(r, backend, monitor_repaint);
 
 	command_builder_build(cb, layout, force_blend, blur_frame, inactive_dim_fixed,
-	                      max_brightness, inactive_dim, monitors, wintype_options);
+	                      max_brightness, monitors, wintype_options);
 	if (log_get_level_tls() <= LOG_LEVEL_TRACE) {
 		auto layer = layout->layers - 1;
 		auto layer_end = &layout->commands[layout->first_layer_start];
diff --git a/src/renderer/renderer.h b/src/renderer/renderer.h
index 3a4b655675..19a1ad6c2e 100644
--- a/src/renderer/renderer.h
+++ b/src/renderer/renderer.h
@@ -22,9 +22,8 @@ struct renderer *renderer_new(struct backend_base *backend, double shadow_radius
                               struct color shadow_color, bool dithered_present);
 bool renderer_render(struct renderer *r, struct backend_base *backend,
                      image_handle root_image, struct layout_manager *lm,
-                     struct command_builder *cb, void *blur_context,
-                     uint64_t render_start_us, xcb_sync_fence_t xsync_fence,
-                     bool use_damage, bool monitor_repaint, bool force_blend,
-                     bool blur_frame, bool inactive_dim_fixed, double max_brightness,
-                     double inactive_dim, const struct x_monitors *monitors,
+                     struct command_builder *cb, void *blur_context, uint64_t render_start_us,
+                     xcb_sync_fence_t xsync_fence, bool use_damage, bool monitor_repaint,
+                     bool force_blend, bool blur_frame, bool inactive_dim_fixed,
+                     double max_brightness, const struct x_monitors *monitors,
                      const struct win_option *wintype_options, uint64_t *after_damage_us);
diff --git a/src/wm/win.c b/src/wm/win.c
index 36f37f7424..93bebf9874 100644
--- a/src/wm/win.c
+++ b/src/wm/win.c
@@ -875,9 +875,9 @@ static void win_update_dim(session_t *ps, struct win *w, bool focused) {
 	}
 
 	if (ps->o.inactive_dim > 0 && !focused) {
-		w->options.dim = TRI_TRUE;
+		w->options.dim = ps->o.inactive_dim;
 	} else {
-		w->options.dim = TRI_FALSE;
+		w->options.dim = 0;
 	}
 }
 
@@ -1017,7 +1017,7 @@ static void win_determine_rounded_corners(session_t *ps, struct win *w) {
 
 	// Don't round full screen windows & excluded windows,
 	// unless we find a corner override in corner_radius_rules
-	if (!matched && w && w->is_fullscreen) {
+	if (!matched && w->is_fullscreen) {
 		w->options.corner_radius = 0;
 		log_debug("Not rounding corners for window %#010x", win_id(w));
 	} else {
diff --git a/src/wm/win.h b/src/wm/win.h
index e48afbd4c9..c5b234d240 100644
--- a/src/wm/win.h
+++ b/src/wm/win.h
@@ -305,7 +305,7 @@ static const struct window_maybe_options WIN_MAYBE_OPTIONS_DEFAULT = {
     .fade = TRI_UNKNOWN,
     .invert_color = TRI_UNKNOWN,
     .paint = TRI_UNKNOWN,
-    .dim = TRI_UNKNOWN,
+    .dim = NAN,
     .opacity = NAN,
     .shader = NULL,
     .corner_radius = -1,
@@ -320,11 +320,11 @@ win_maybe_options_fold(struct window_maybe_options upper, struct window_maybe_op
 	    .blur_background = tri_or(upper.blur_background, lower.blur_background),
 	    .clip_shadow_above = tri_or(upper.clip_shadow_above, lower.clip_shadow_above),
 	    .shadow = tri_or(upper.shadow, lower.shadow),
-	    .dim = tri_or(upper.dim, lower.dim),
 	    .fade = tri_or(upper.fade, lower.fade),
 	    .invert_color = tri_or(upper.invert_color, lower.invert_color),
 	    .paint = tri_or(upper.paint, lower.paint),
 	    .opacity = !safe_isnan(upper.opacity) ? upper.opacity : lower.opacity,
+	    .dim = !safe_isnan(upper.dim) ? upper.dim : lower.dim,
 	    .shader = upper.shader ? upper.shader : lower.shader,
 	    .corner_radius = upper.corner_radius >= 0 ? upper.corner_radius : lower.corner_radius,
 	};
@@ -340,11 +340,11 @@ win_maybe_options_or(struct window_maybe_options maybe, struct window_options de
 	    .shadow = tri_or_bool(maybe.shadow, def.shadow),
 	    .corner_radius = maybe.corner_radius >= 0 ? (unsigned int)maybe.corner_radius
 	                                              : def.corner_radius,
-	    .dim = tri_or_bool(maybe.dim, def.dim),
 	    .fade = tri_or_bool(maybe.fade, def.fade),
 	    .invert_color = tri_or_bool(maybe.invert_color, def.invert_color),
 	    .paint = tri_or_bool(maybe.paint, def.paint),
 	    .opacity = !safe_isnan(maybe.opacity) ? maybe.opacity : def.opacity,
+	    .dim = !safe_isnan(maybe.dim) ? maybe.dim : def.dim,
 	    .shader = maybe.shader ? maybe.shader : def.shader,
 	};
 }