diff --git a/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue b/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
index 0312017d86..ff3b9aff9b 100644
--- a/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
+++ b/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
@@ -16,22 +16,54 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 	<div :class="$style.root" class="_gaps">
 		<div v-for="[k, v] in Object.entries(fx.params)" :key="k">
-			<MkSwitch v-if="v.type === 'boolean'" v-model="layer.params[k]">
+			<MkSwitch
+				v-if="v.type === 'boolean'"
+				v-model="layer.params[k]"
+			>
 				<template #label>{{ k }}</template>
 			</MkSwitch>
-			<MkRange v-else-if="v.type === 'number'" v-model="layer.params[k]" continuousUpdate :min="v.min" :max="v.max" :step="v.step">
+			<MkRange
+				v-else-if="v.type === 'number'"
+				v-model="layer.params[k]"
+				continuousUpdate
+				:min="v.min"
+				:max="v.max"
+				:step="v.step"
+				@thumbDoubleClicked="() => {
+					if (fx.params[k].default != null) {
+						layer.params[k] = fx.params[k].default;
+					} else {
+						layer.params[k] = v.min;
+					}
+				}"
+			>
 				<template #label>{{ k }}</template>
 			</MkRange>
-			<MkRadios v-else-if="v.type === 'number:enum'" v-model="layer.params[k]">
+			<MkRadios
+				v-else-if="v.type === 'number:enum'"
+				v-model="layer.params[k]"
+			>
 				<template #label>{{ k }}</template>
 				<option v-for="item in v.enum" :value="item.value">{{ item.label }}</option>
 			</MkRadios>
 			<div v-else-if="v.type === 'seed'">
-				<MkRange v-model="layer.params[k]" continuousUpdate type="number" :min="0" :max="10000" :step="1">
+				<MkRange
+					v-model="layer.params[k]"
+					continuousUpdate
+					type="number"
+					:min="0"
+					:max="10000"
+					:step="1"
+				>
 					<template #label>{{ k }}</template>
 				</MkRange>
 			</div>
-			<MkInput v-else-if="v.type === 'color'" :modelValue="`#${(layer.params[k][0] * 255).toString(16).padStart(2, '0')}${(layer.params[k][1] * 255).toString(16).padStart(2, '0')}${(layer.params[k][2] * 255).toString(16).padStart(2, '0')}`" type="color" @update:modelValue="v => { const c = v.slice(1).match(/.{2}/g)?.map(x => parseInt(x, 16) / 255); if (c) layer.params[k] = c; }">
+			<MkInput
+				v-else-if="v.type === 'color'"
+				:modelValue="getHex(layer.params[k])"
+				type="color"
+				@update:modelValue="v => { const c = getRgb(v); if (c != null) layer.params[k] = c; }"
+			>
 				<template #label>{{ k }}</template>
 			</MkInput>
 		</div>
@@ -40,22 +72,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script setup lang="ts">
-import { ref, useTemplateRef, watch, onMounted, onUnmounted } from 'vue';
 import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
 import { i18n } from '@/i18n.js';
-import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
 import MkFolder from '@/components/MkFolder.vue';
 import MkButton from '@/components/MkButton.vue';
 import MkInput from '@/components/MkInput.vue';
 import MkRadios from '@/components/MkRadios.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkRange from '@/components/MkRange.vue';
-import FormSlot from '@/components/form/slot.vue';
-import MkPositionSelector from '@/components/MkPositionSelector.vue';
-import * as os from '@/os.js';
-import { selectFile } from '@/utility/drive.js';
-import { misskeyApi } from '@/utility/misskey-api.js';
-import { prefer } from '@/preferences.js';
 import { FXS } from '@/utility/image-effector/fxs.js';
 
 const layer = defineModel<ImageEffectorLayer>('layer', { required: true });
@@ -69,6 +93,24 @@ const emit = defineEmits<{
 	(e: 'swapUp'): void;
 	(e: 'swapDown'): void;
 }>();
+
+function getHex(c: [number, number, number]) {
+	return `#${c.map(x => (x * 255).toString(16).padStart(2, '0')).join('')}`;
+}
+
+function getRgb(hex: string | number): [number, number, number] | null {
+	if (
+		typeof hex === 'number' ||
+		typeof hex !== 'string' ||
+		!/^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/.test(hex)
+	) {
+		return null;
+	}
+
+	const m = hex.slice(1).match(/[0-9a-fA-F]{2}/g);
+	if (m == null) return [0, 0, 0];
+	return m.map(x => parseInt(x, 16) / 255) as [number, number, number];
+}
 </script>
 
 <style module>
diff --git a/packages/frontend/src/components/MkRange.vue b/packages/frontend/src/components/MkRange.vue
index 9a6a207c74..7a5848de48 100644
--- a/packages/frontend/src/components/MkRange.vue
+++ b/packages/frontend/src/components/MkRange.vue
@@ -12,10 +12,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<slot name="prefix"></slot>
 		<div ref="containerEl" class="container">
 			<div class="track">
-				<div class="highlight right" :style="{ width: ((steppedRawValue - minRatio) * 100) + '%', left: (Math.abs(Math.min(0, min)) / (max + Math.abs(Math.min(0, min)))) * 100 + '%' }">
+				<div class="highlight right" :style="{ width: rightTrackWidth, left: rightTrackPosition }">
 					<div class="shine right"></div>
 				</div>
-				<div class="highlight left" :style="{ width: ((minRatio - steppedRawValue) * 100) + '%', left: (steppedRawValue) * 100 + '%' }">
+				<div class="highlight left" :style="{ width: leftTrackWidth, left: leftTrackPosition }">
 					<div class="shine left"></div>
 				</div>
 			</div>
@@ -42,7 +42,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, defineAsyncComponent, onMounted, onUnmounted, ref, useTemplateRef, watch } from 'vue';
+import { computed, defineAsyncComponent, onMounted, onUnmounted, onBeforeUnmount, ref, useTemplateRef, watch } from 'vue';
 import { isTouchUsing } from '@/utility/touch.js';
 import * as os from '@/os.js';
 
@@ -58,13 +58,14 @@ const props = withDefaults(defineProps<{
 	continuousUpdate?: boolean;
 }>(), {
 	step: 1,
-	textConverter: (v) => v.toString(),
+	textConverter: (v: number) => (Math.round(v * 1000) / 1000).toString(),
 	easing: false,
 });
 
 const emit = defineEmits<{
 	(ev: 'update:modelValue', value: number): void;
 	(ev: 'dragEnded', value: number): void;
+	(ev: 'thumbDoubleClicked'): void;
 }>();
 
 const containerEl = useTemplateRef('containerEl');
@@ -73,7 +74,24 @@ const thumbEl = useTemplateRef('thumbEl');
 const maxRatio = computed(() => Math.abs(props.max) / (props.max + Math.abs(Math.min(0, props.min))));
 const minRatio = computed(() => Math.abs(Math.min(0, props.min)) / (props.max + Math.abs(Math.min(0, props.min))));
 
-const rawValue = ref((props.modelValue - props.min) / (props.max - props.min));
+const rightTrackWidth = computed(() => {
+	return Math.max(0, (steppedRawValue.value - minRatio.value) * 100) + '%';
+});
+const leftTrackWidth = computed(() => {
+	return Math.max(0, (minRatio.value - steppedRawValue.value) * 100) + '%';
+});
+const rightTrackPosition = computed(() => {
+	return (Math.abs(Math.min(0, props.min)) / (props.max + Math.abs(Math.min(0, props.min)))) * 100 + '%';
+});
+const leftTrackPosition = computed(() => {
+	return (Math.min(minRatio.value, steppedRawValue.value) * 100) + '%';
+});
+
+const calcRawValue = (value: number) => {
+	return (value - props.min) / (props.max - props.min);
+};
+
+const rawValue = ref(calcRawValue(props.modelValue));
 const steppedRawValue = computed(() => {
 	if (props.step) {
 		const step = props.step / (props.max - props.min);
@@ -103,6 +121,11 @@ const calcThumbPosition = () => {
 	}
 };
 watch([steppedRawValue, containerEl], calcThumbPosition);
+watch(() => props.modelValue, (newVal) => {
+	const newRawValue = calcRawValue(newVal);
+	if (rawValue.value === newRawValue) return;
+	rawValue.value = newRawValue;
+});
 
 let ro: ResizeObserver | undefined;
 
@@ -128,6 +151,12 @@ const steps = computed(() => {
 const tooltipForDragShowing = ref(false);
 const tooltipForHoverShowing = ref(false);
 
+onBeforeUnmount(() => {
+	// 何らかの問題で表示されっぱなしでもコンポーネントを離れたら消えるように
+	tooltipForDragShowing.value = false;
+	tooltipForHoverShowing.value = false;
+});
+
 function onMouseenter() {
 	if (isTouchUsing) return;
 
@@ -138,7 +167,7 @@ function onMouseenter() {
 		text: computed(() => {
 			return props.textConverter(finalValue.value);
 		}),
-		targetElement: thumbEl,
+		targetElement: thumbEl.value ?? undefined,
 	}, {
 		closed: () => dispose(),
 	});
@@ -148,6 +177,8 @@ function onMouseenter() {
 	}, { once: true, passive: true });
 }
 
+let lastClickTime: number | null = null;
+
 function onMousedown(ev: MouseEvent | TouchEvent) {
 	ev.preventDefault();
 
@@ -158,7 +189,7 @@ function onMousedown(ev: MouseEvent | TouchEvent) {
 		text: computed(() => {
 			return props.textConverter(finalValue.value);
 		}),
-		targetElement: thumbEl,
+		targetElement: thumbEl.value ?? undefined,
 	}, {
 		closed: () => dispose(),
 	});
@@ -203,6 +234,20 @@ function onMousedown(ev: MouseEvent | TouchEvent) {
 	window.addEventListener('touchmove', onDrag);
 	window.addEventListener('mouseup', onMouseup, { once: true });
 	window.addEventListener('touchend', onMouseup, { once: true });
+
+	if (lastClickTime == null) {
+		lastClickTime = Date.now();
+		return;
+	} else {
+		const now = Date.now();
+		if (now - lastClickTime < 300) { // 300ms以内のクリックはダブルクリックとみなす
+			lastClickTime = null;
+			emit('thumbDoubleClicked');
+			return;
+		} else {
+			lastClickTime = now;
+		}
+	}
 }
 </script>