diff --git a/src/app.css b/src/app.css
index d127ba2..8a2f662 100644
--- a/src/app.css
+++ b/src/app.css
@@ -48,10 +48,9 @@
 
   --text-main: oklch(from var(--brand-main) 0.94 0.01 h);
   --text-muted: oklch(from var(--brand-main) 0.75 0.02 h);
-  /* --text-action: oklch(from var(--brand-main) 0.12 0.02 h); */
 
-  --border-main: oklch(from var(--brand-main) 0.22 0.04 h);
-  --border-strong: oklch(from var(--brand-main) 0.3 0.06 h);
+  --border-main: oklch(from var(--brand-main) 0.26 0.04 h);
+  --border-strong: oklch(from var(--brand-main) 0.4 0.06 h);
 
   --shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
   --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
diff --git a/src/components/image/CropInline.svelte b/src/components/image/CropInline.svelte
index e857aa8..60f8929 100644
--- a/src/components/image/CropInline.svelte
+++ b/src/components/image/CropInline.svelte
@@ -1,12 +1,56 @@
 <script lang="ts">
+  import { IMAGE_SETTINGS, PANEL_SETTINGS } from "$lib/constants";
   import { imageState } from "$states/image.svelte";
+  import Konva from "konva";
+  import { onMount } from "svelte";
+  import { Image, Layer, Stage } from "svelte-konva";
 
   let active = $state(false);
+  let masterImage: Image | undefined = $state();
+
+  let contrast = $derived(imageState.appliedFilters.contrast);
+  let brightness = $derived(imageState.appliedFilters.brightness);
+  let hue = $derived(imageState.appliedFilters.hue);
+  let saturation = $derived(imageState.appliedFilters.saturation);
+  let luminance = $derived(imageState.appliedFilters.luminance);
+
+  function updateMasterImage() {
+    if (masterImage?.node && masterImage?.node?.width() > 0) {
+      masterImage?.node.cache();
+      imageState.masterImage = masterImage?.node.toCanvas();
+    }
+  }
+
+  $effect(() => {
+    void contrast;
+    void brightness;
+    void hue;
+    void saturation;
+    void luminance;
+    updateMasterImage();
+  });
+
+  onMount(async () => {
+    updateMasterImage();
+  });
 </script>
 
 <div class="crop-canvas-container">
-  <img src={imageState.fullImage} alt="Background for use" />
-  <canvas class="crop-canvas"></canvas>
+  <Stage width={PANEL_SETTINGS.PANEL_WIDTH} height={PANEL_SETTINGS.PANEL_HEIGHT_DEFAULT}>
+    <Layer>
+      <Image
+        image={imageState.croppedImage}
+        bind:this={masterImage}
+        filters={[Konva.Filters.Brightness, Konva.Filters.Contrast, Konva.Filters.HSL]}
+        brightness={brightness / IMAGE_SETTINGS.BRIGHTNESS_DIVIDER}
+        {contrast}
+        {hue}
+        saturation={saturation / IMAGE_SETTINGS.SATURATION_DIVIDER}
+        luminance={luminance / IMAGE_SETTINGS.LUMINANCE_DIVIDER}
+      />
+    </Layer>
+  </Stage>
+
   <div class="crop-box" class:active>
     <div class="crop-handle nw"></div>
     <div class="crop-handle ne"></div>
@@ -30,12 +74,6 @@
     cursor: crosshair;
   }
 
-  .crop-canvas {
-    width: 100%;
-    height: 100%;
-    display: block;
-  }
-
   .crop-box {
     position: absolute;
     border: 2px solid var(--action-primary);
diff --git a/src/components/image/ImageManager.svelte b/src/components/image/ImageManager.svelte
index d078e70..627c846 100644
--- a/src/components/image/ImageManager.svelte
+++ b/src/components/image/ImageManager.svelte
@@ -9,14 +9,10 @@
   import { imageState } from "$states/image.svelte";
   import Pencil from "~icons/lucide/pencil";
   import Reset from "~icons/lucide/rotate-ccw";
+  import Sliders from "~icons/lucide/sliders-horizontal";
   import Upload from "~icons/lucide/upload";
   import CropInline from "./CropInline.svelte";
 
-  let brightness = $state(IMAGE_SETTINGS.DEFAULT_BRIGHTNESS);
-  let contrast = $state(IMAGE_SETTINGS.DEFAULT_CONTRAST);
-  let hue = $state(IMAGE_SETTINGS.DEFAULT_HUE);
-  let chroma = $state(IMAGE_SETTINGS.DEFAULT_CHROMA);
-
   async function handlePaste(event: ClipboardEvent) {
     let image = await uploadService.fromClipboard(event);
     if (image.ok) {
@@ -35,29 +31,50 @@
       <Button label="Сбросить" ariaLabel="Reset" icon={Reset} type="outline" />
     </div>
 
-    <SettingsGrid>
-      <SettingsRow label="Смещение цвета">
-        <RangeSlider bind:value={hue} min={IMAGE_SETTINGS.HUE_MIN} max={IMAGE_SETTINGS.HUE_MAX} />
+    <SettingsGrid label="Настройки изображения" icon={Sliders}>
+      <SettingsRow label="Сдвиг цвета">
+        <RangeSlider
+          bind:value={imageState.hue}
+          min={IMAGE_SETTINGS.HUE_MIN}
+          max={IMAGE_SETTINGS.HUE_MAX}
+          defaultValue={IMAGE_SETTINGS.HUE_DEFAULT}
+          showReset={true}
+        />
       </SettingsRow>
       <SettingsRow label="Насыщенность">
         <RangeSlider
-          bind:value={chroma}
-          min={IMAGE_SETTINGS.CHROMA_MIN}
-          max={IMAGE_SETTINGS.CHROMA_MAX}
+          bind:value={imageState.saturation}
+          min={IMAGE_SETTINGS.SATURATION_MIN}
+          max={IMAGE_SETTINGS.SATURATION_MAX}
+          defaultValue={IMAGE_SETTINGS.SATURATION_DEFAULT}
+          showReset={true}
         />
       </SettingsRow>
       <SettingsRow label="Яркость">
         <RangeSlider
-          bind:value={brightness}
+          bind:value={imageState.luminance}
+          min={IMAGE_SETTINGS.LUMINANCE_MIN}
+          max={IMAGE_SETTINGS.LUMINANCE_MAX}
+          defaultValue={IMAGE_SETTINGS.LUMINANCE_DEFAULT}
+          showReset={true}
+        />
+      </SettingsRow>
+      <SettingsRow label="Светлота">
+        <RangeSlider
+          bind:value={imageState.brightness}
           min={IMAGE_SETTINGS.BRIGHTNESS_MIN}
           max={IMAGE_SETTINGS.BRIGHTNESS_MAX}
+          defaultValue={IMAGE_SETTINGS.BRIGHTNESS_DEFAULT}
+          showReset={true}
         />
       </SettingsRow>
       <SettingsRow label="Контраст">
         <RangeSlider
-          bind:value={contrast}
+          bind:value={imageState.contrast}
           min={IMAGE_SETTINGS.CONTRAST_MIN}
           max={IMAGE_SETTINGS.CONTRAST_MAX}
+          defaultValue={IMAGE_SETTINGS.CONTRAST_DEFAULT}
+          showReset={true}
         />
       </SettingsRow>
     </SettingsGrid>
diff --git a/src/components/layout/SettingsGrid.svelte b/src/components/layout/SettingsGrid.svelte
index e5b6115..6a0df13 100644
--- a/src/components/layout/SettingsGrid.svelte
+++ b/src/components/layout/SettingsGrid.svelte
@@ -1,15 +1,26 @@
 <script lang="ts">
-  import type { Snippet } from "svelte";
+  import Button from "$components/ui/Button.svelte";
+  import type { Component, Snippet } from "svelte";
 
   interface Props {
     children: Snippet;
+    label: string;
+    icon: Component;
   }
 
-  let { children }: Props = $props();
+  let { children, label = "fuf", icon }: Props = $props();
+
+  let expanded = $state(false);
 </script>
 
 <div class="settings-grid">
-  {@render children()}
+  <label>
+    {label}
+    <Button {icon} ariaLabel="Expand" type="mini" onclick={() => (expanded = !expanded)} />
+  </label>
+  {#if expanded}
+    {@render children()}
+  {/if}
 </div>
 
 <style>
@@ -17,5 +28,20 @@
     display: flex;
     flex-direction: column;
     gap: 12px;
+    padding: 12px;
+    background: var(--surface-subtle);
+    border-radius: var(--radius);
+    border: 1px solid var(--border-main);
+  }
+
+  label {
+    color: var(--text-main);
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+    font-size: 16px;
+    cursor: pointer;
+    user-select: none;
   }
 </style>
diff --git a/src/components/panel/Preview.svelte b/src/components/panel/Preview.svelte
index 13d359b..32cc402 100644
--- a/src/components/panel/Preview.svelte
+++ b/src/components/panel/Preview.svelte
@@ -14,7 +14,6 @@
   let x = $derived(textConfigState.paddingX);
   let y = $derived(textConfigState.offsetY);
   let width = $derived(PANEL_SETTINGS.PANEL_WIDTH - 2 * textConfigState.paddingX);
-  let height = PANEL_SETTINGS.PANEL_HEIGHT_DEFAULT;
 </script>
 
 <Stage
@@ -23,20 +22,17 @@
   bind:this={stage}
 >
   <Layer>
-    <Image image={imageState.croppedImage}></Image>
+    <Image image={imageState.masterImage} listening={false} />
     <Text
       {text}
       {x}
       {y}
       {width}
-      {height}
       fontSize={textConfigState.fontSize}
       stroke={textConfigState.outlined ? textConfigState.color : "transparent"}
       fill={textConfigState.outlined ? "transparent" : textConfigState.color}
       fontFamily={textConfigState.fontFamily}
       align={textConfigState.align}
-      wrap="none"
-      ellipsis={true}
     />
   </Layer>
 </Stage>
diff --git a/src/components/panel/PreviewManager.svelte b/src/components/panel/PreviewManager.svelte
index 3abfa8c..35cc8fb 100644
--- a/src/components/panel/PreviewManager.svelte
+++ b/src/components/panel/PreviewManager.svelte
@@ -4,11 +4,13 @@
   import Button from "$components/ui/Button.svelte";
   import { PANEL_SETTINGS, TRANSITION_DURATION, type SlideDirectionType } from "$lib/constants";
   import { downloadService, type DownloadItem } from "$services/downloadService";
+  import { imageState } from "$states/image.svelte";
   import { konvaAllStagesState } from "$states/konvaAllStages.svelte";
   import { konvaStageState } from "$states/konvaStage.svelte";
   import { textsState } from "$states/texts.svelte";
   import { fly } from "svelte/transition";
   import Download from "~icons/lucide/download";
+  import Loader from "~icons/lucide/loader";
   import StickyNote from "~icons/lucide/sticky-note";
   import Preview from "./Preview.svelte";
   import PreviewAll from "./PreviewAll.svelte";
@@ -67,6 +69,9 @@
             in:fly={{ x: xDirection, duration: TRANSITION_DURATION }}
             out:fly={{ x: -xDirection, duration: TRANSITION_DURATION }}
           >
+            <div class="loader" class:loading={imageState.isReady === false}>
+              <Loader />
+            </div>
             <Preview {text} bind:stage={konvaStageState.stage} />
           </div>
         {/key}
@@ -141,4 +146,29 @@
     justify-content: center;
     align-items: center;
   }
+
+  .loader {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 32px;
+    height: 32px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    transition: 0.3s;
+    opacity: 0;
+    &.loading {
+      opacity: 1;
+      animation: spin 3s linear infinite;
+    }
+  }
+  @keyframes spin {
+    0% {
+      transform: rotate(0deg);
+    }
+    100% {
+      transform: rotate(360deg);
+    }
+  }
 </style>
diff --git a/src/components/text/TextConfig.svelte b/src/components/text/TextConfig.svelte
index 8e602f4..4cb303e 100644
--- a/src/components/text/TextConfig.svelte
+++ b/src/components/text/TextConfig.svelte
@@ -9,10 +9,11 @@
   import SelectFont from "$components/ui/SelectFont.svelte";
   import { TYPOGRAPHY } from "$lib/constants";
   import { textConfigState } from "$states/textConfig.svelte";
+  import TextSettings from "~icons/lucide/text-initial";
 </script>
 
 <Card title="Настройки текста">
-  <SettingsGrid>
+  <SettingsGrid label="Настройки шрифта" icon={TextSettings}>
     <SettingsRow label="Размер">
       <RangeSlider
         bind:value={textConfigState.fontSize}
diff --git a/src/components/ui/Button.svelte b/src/components/ui/Button.svelte
index 1418535..1d8cf1f 100644
--- a/src/components/ui/Button.svelte
+++ b/src/components/ui/Button.svelte
@@ -27,7 +27,7 @@
   class="btn"
   class:btn-primary={type === "primary"}
   class:btn-secondary={type === "secondary"}
-  class:btn-outline={type === "outline"}
+  class:btn-outline={type === "outline" || type === "mini"}
   class:btn-danger={type === "danger"}
   class:btn-mini={type === "mini"}
   class:grow={extra === "grow"}
@@ -79,6 +79,19 @@
     --btn-hover: var(--action-secondary-hover);
   }
 
+  .btn-mini {
+    width: 32px;
+    height: 32px;
+    padding: 0;
+    border: 1px solid var(--border-main);
+    border-radius: var(--radius);
+    justify-content: center;
+  }
+
+  .btn-mini:hover:not(:disabled) {
+    border-color: var(--border-main);
+  }
+
   .btn-outline {
     background: transparent;
     color: var(--text-main);
@@ -95,19 +108,6 @@
     --btn-main: var(--danger-base);
   }
 
-  .btn-mini {
-    width: 32px;
-    height: 32px;
-    padding: 0;
-    border: 1px solid var(--border-main);
-    border-radius: var(--radius);
-    justify-content: center;
-  }
-
-  .btn-mini:hover:not(:disabled) {
-    border-color: var(--border-main);
-  }
-
   .grow {
     flex-grow: 1;
     justify-content: center;
diff --git a/src/components/ui/RangeSlider.svelte b/src/components/ui/RangeSlider.svelte
index 06b149d..922820f 100644
--- a/src/components/ui/RangeSlider.svelte
+++ b/src/components/ui/RangeSlider.svelte
@@ -1,19 +1,34 @@
 <script lang="ts">
   import type { ChangeEventHandler } from "svelte/elements";
+  import Reset from "~icons/lucide/rotate-ccw";
+  import Button from "./Button.svelte";
 
   interface Props {
     value: number;
     min?: number;
     max?: number;
     step?: number;
+    defaultValue?: number;
+    showReset?: boolean;
     onchange?: ChangeEventHandler<HTMLInputElement>;
   }
 
-  let { value = $bindable(), min = 0, max = 100, step = 1, onchange = () => {} }: Props = $props();
+  let {
+    value = $bindable(),
+    min = 0,
+    max = 100,
+    step = 1,
+    onchange = () => {},
+    defaultValue = 0,
+    showReset = false,
+  }: Props = $props();
 </script>
 
 <input type="range" {min} {max} {step} bind:value class="slider" {onchange} />
 <span class="value-display">{value}</span>
+{#if showReset}
+  <Button ariaLabel="Reset" icon={Reset} type="mini" onclick={() => (value = defaultValue)} />
+{/if}
 
 <style>
   .slider {
diff --git a/src/lib/constants.ts b/src/lib/constants.ts
index e360e6c..ff91a0c 100644
--- a/src/lib/constants.ts
+++ b/src/lib/constants.ts
@@ -51,21 +51,28 @@ export const IMAGE_SETTINGS = {
 
   DEFAULT_BACKGROUND_IMAGE: "./backgrounds/b1.jpg",
 
-  DEFAULT_HUE: 0,
+  HUE_DEFAULT: 0,
   HUE_MIN: 0,
   HUE_MAX: 360,
 
-  DEFAULT_CHROMA: 100,
-  CHROMA_MIN: 0,
-  CHROMA_MAX: 300,
+  SATURATION_DEFAULT: 0,
+  SATURATION_MIN: -20,
+  SATURATION_MAX: 50,
+  SATURATION_DIVIDER: 10,
 
-  DEFAULT_BRIGHTNESS: 100,
+  LUMINANCE_DEFAULT: 0,
+  LUMINANCE_MIN: -100,
+  LUMINANCE_MAX: 100,
+  LUMINANCE_DIVIDER: 100,
+
+  BRIGHTNESS_DEFAULT: 100,
   BRIGHTNESS_MIN: 0,
-  BRIGHTNESS_MAX: 100,
+  BRIGHTNESS_MAX: 200,
+  BRIGHTNESS_DIVIDER: 100,
 
-  DEFAULT_CONTRAST: 100,
-  CONTRAST_MIN: 50,
-  CONTRAST_MAX: 150,
+  CONTRAST_DEFAULT: 0,
+  CONTRAST_MIN: -100,
+  CONTRAST_MAX: 100,
 } as const;
 
 export const SlideDirection = {
diff --git a/src/states/image.svelte.ts b/src/states/image.svelte.ts
index ac5b763..574ed3d 100644
--- a/src/states/image.svelte.ts
+++ b/src/states/image.svelte.ts
@@ -1,3 +1,10 @@
+import { IMAGE_SETTINGS } from "$lib/constants";
+import { withPersistence, type Persistable } from "./persisted.svelte";
+
+// export const DEBOUNCE_DURATION = import.meta.env.MODE === "test" ? 0 : 200;
+export const DEBOUNCE_DURATION = 150;
+export const INITIAL_DELAY_DURATION = 500;
+
 export interface Rect {
   left: number;
   top: number;
@@ -5,46 +12,137 @@ export interface Rect {
   bottom: number;
 }
 
-export type ImageConfig = {
+export interface ImageConfigDTO {
+  fullImage: string | null;
+  cropRect: Rect;
+  brightness: number;
+  contrast: number;
+  hue: number;
+  saturation: number;
+  luminance: number;
+}
+
+const ImageConfigDTOKeys: (keyof ImageConfigDTO)[] = [
+  "fullImage",
+  "cropRect",
+  "brightness",
+  "contrast",
+  "hue",
+  "saturation",
+  "luminance",
+];
+
+export interface ImageConfig {
   fullImage: string | null;
   croppedImage: HTMLImageElement | undefined;
   cropRect: Rect;
-};
-
-function createState(): ImageConfig & { reset: () => void } {
-  let fullImage = $state<string | null>(null);
-  let croppedImage = $state<HTMLImageElement | undefined>(undefined);
-  let crop: Rect = $state({ left: 0, top: 0, right: 0, bottom: 0 });
-
-  return {
-    get fullImage(): string | null {
-      return fullImage;
-    },
-    set fullImage(image: string) {
-      if (image) {
-        const img = new Image();
-        img.onload = () => {
-          fullImage = image;
-          croppedImage = img;
-        };
-        img.src = image;
-      }
-    },
-    get croppedImage() {
-      return croppedImage;
-    },
-    get cropRect() {
-      return crop;
-    },
-    set cropRect(rect: Rect) {
-      crop = rect;
-    },
-    reset() {
-      fullImage = null;
-      croppedImage = undefined;
-      crop = { left: 0, top: 0, right: 0, bottom: 0 };
-    },
-  };
+  brightness: number;
+  contrast: number;
+  hue: number;
+  saturation: number;
+  luminance: number;
+  isReady: boolean;
+  appliedFilters: FilterConfig;
 }
 
-export const imageState = createState();
+interface FilterConfig {
+  brightness: number;
+  contrast: number;
+  hue: number;
+  saturation: number;
+  luminance: number;
+}
+
+export class ImageState implements Persistable<ImageConfigDTO> {
+  #fullImage: string = $state("");
+  croppedImage: HTMLImageElement | undefined = $state(undefined);
+  masterImage: HTMLCanvasElement | undefined = $state(undefined);
+  cropRect: Rect = $state({ left: 0, top: 0, right: 0, bottom: 0 });
+
+  brightness: number = $state(IMAGE_SETTINGS.BRIGHTNESS_DEFAULT + 1);
+  contrast: number = $state(IMAGE_SETTINGS.CONTRAST_DEFAULT);
+  hue: number = $state(IMAGE_SETTINGS.HUE_DEFAULT);
+  saturation: number = $state(IMAGE_SETTINGS.SATURATION_DEFAULT);
+  luminance: number = $state(IMAGE_SETTINGS.LUMINANCE_DEFAULT);
+  isReady: boolean = $state(false);
+
+  appliedFilters: FilterConfig = $state({
+    brightness: 0,
+    contrast: 0,
+    hue: 0,
+    saturation: 0,
+    luminance: 0,
+  });
+
+  constructor() {
+    $effect.root(() => {
+      $effect(() => {
+        const brightness = this.brightness;
+        const contrast = this.contrast;
+        const hue = this.hue;
+        const saturation = this.saturation;
+        const luminance = this.luminance;
+        this.isReady = false;
+
+        const timeout = setTimeout(() => {
+          this.updateFilters({
+            hue,
+            saturation,
+            luminance,
+            brightness,
+            contrast,
+          });
+        }, DEBOUNCE_DURATION);
+
+        return () => clearTimeout(timeout);
+      });
+    });
+  }
+
+  updateFilters(newFilters: FilterConfig) {
+    this.appliedFilters = newFilters;
+    this.isReady = true;
+  }
+
+  reset() {
+    this.#fullImage = "";
+    this.croppedImage = undefined;
+    this.cropRect = { left: 0, top: 0, right: 0, bottom: 0 };
+    this.brightness = 0;
+    this.contrast = 0;
+    this.hue = 0;
+  }
+  get fullImage() {
+    return this.#fullImage;
+  }
+  set fullImage(image: string) {
+    if (image) {
+      const img = new Image();
+      img.onload = () => {
+        this.#fullImage = image;
+        this.croppedImage = img;
+      };
+      img.src = image;
+    }
+  }
+  toSnapshot(): ImageConfigDTO {
+    return {
+      fullImage: this.#fullImage,
+      cropRect: this.cropRect,
+      brightness: this.brightness,
+      contrast: this.contrast,
+      hue: this.hue,
+      saturation: this.saturation,
+      luminance: this.luminance,
+    };
+  }
+  fromSnapshot(data: Partial<ImageConfigDTO>): void {
+    for (const key of ImageConfigDTOKeys) {
+      if (key in data && data[key] !== undefined) {
+        (this as ImageConfigDTO)[key] = data[key] as never;
+      }
+    }
+  }
+}
+
+export const imageState = withPersistence("image", new ImageState());
diff --git a/src/states/konvaStage.svelte.ts b/src/states/konvaStage.svelte.ts
index 0738e38..3f0bfd3 100644
--- a/src/states/konvaStage.svelte.ts
+++ b/src/states/konvaStage.svelte.ts
@@ -1,16 +1,7 @@
 import type { Stage } from "svelte-konva";
 
-function createState() {
-  let stage: Stage | undefined = $state(undefined);
-
-  return {
-    get stage(): Stage | undefined {
-      return stage;
-    },
-    set stage(newStage: Stage) {
-      stage = newStage;
-    },
-  };
+export class KonvaStage {
+  stage: Stage | undefined = $state(undefined);
 }
 
-export const konvaStageState = createState();
+export const konvaStageState = new KonvaStage();
diff --git a/tests/unit/__snapshots__/constants.test.ts.snap b/tests/unit/__snapshots__/constants.test.ts.snap
index 43eca83..2a83697 100644
--- a/tests/unit/__snapshots__/constants.test.ts.snap
+++ b/tests/unit/__snapshots__/constants.test.ts.snap
@@ -3,20 +3,26 @@
 exports[`Application Constants Logic > Global Contract (Snapshot) > should match the previous configuration snapshot 1`] = `
 {
   "IMAGE_SETTINGS": {
-    "BRIGHTNESS_MAX": 100,
+    "BRIGHTNESS_DEFAULT": 100,
+    "BRIGHTNESS_DIVIDER": 100,
+    "BRIGHTNESS_MAX": 200,
     "BRIGHTNESS_MIN": 0,
-    "CHROMA_MAX": 300,
-    "CHROMA_MIN": 0,
-    "CONTRAST_MAX": 150,
-    "CONTRAST_MIN": 50,
+    "CONTRAST_DEFAULT": 0,
+    "CONTRAST_MAX": 100,
+    "CONTRAST_MIN": -100,
     "DEFAULT_BACKGROUND_IMAGE": "./backgrounds/b1.jpg",
-    "DEFAULT_BRIGHTNESS": 100,
-    "DEFAULT_CHROMA": 100,
-    "DEFAULT_CONTRAST": 100,
-    "DEFAULT_HUE": 0,
+    "HUE_DEFAULT": 0,
     "HUE_MAX": 360,
     "HUE_MIN": 0,
+    "LUMINANCE_DEFAULT": 0,
+    "LUMINANCE_DIVIDER": 100,
+    "LUMINANCE_MAX": 100,
+    "LUMINANCE_MIN": -100,
     "MAX_FILE_SIZE": 10485760,
+    "SATURATION_DEFAULT": 0,
+    "SATURATION_DIVIDER": 10,
+    "SATURATION_MAX": 50,
+    "SATURATION_MIN": -20,
     "SUPPORTED_FORMATS": [
       "image/jpeg",
       "image/jpg",
diff --git a/tests/unit/components/layout/SettingsGrid.test.ts b/tests/unit/components/layout/SettingsGrid.test.ts
index 24b0611..03281ba 100644
--- a/tests/unit/components/layout/SettingsGrid.test.ts
+++ b/tests/unit/components/layout/SettingsGrid.test.ts
@@ -1,12 +1,48 @@
 import { render, screen } from "@testing-library/svelte";
+import userEvent from "@testing-library/user-event";
 import { describe, expect, it } from "vitest";
 import SettingsGridTest from "./SettingsGridTest.svelte";
 
 describe("SettingsGrid.svelte", () => {
-  it("should render without crashing", () => {
-    render(SettingsGridTest);
-    expect(screen.getByTestId("item1")).toBeInTheDocument();
-    expect(screen.getByTestId("item2")).toBeInTheDocument();
-    expect(screen.getByTestId("item3")).toBeInTheDocument();
+  describe("initial state", () => {
+    it("should render with collapsed state by default", () => {
+      render(SettingsGridTest);
+      expect(screen.queryByText("Item 1")).not.toBeInTheDocument();
+      expect(screen.queryByText("Item 2")).not.toBeInTheDocument();
+      expect(screen.queryByText("Item 3")).not.toBeInTheDocument();
+    });
+
+    it("should display the label", () => {
+      render(SettingsGridTest);
+      expect(screen.getByText("Test Grid")).toBeInTheDocument();
+    });
+
+    it("should render expand button", () => {
+      render(SettingsGridTest);
+      const expandButton = screen.getByRole("button", { name: "Expand" });
+      expect(expandButton).toBeInTheDocument();
+    });
+  });
+
+  describe("expand/collapse behavior", () => {
+    it("should show children when expand button is clicked", async () => {
+      const user = userEvent.setup();
+      render(SettingsGridTest);
+      const expandButton = screen.getByRole("button", { name: "Expand" });
+      await user.click(expandButton);
+      expect(screen.getByText("Item 1")).toBeInTheDocument();
+      expect(screen.getByText("Item 2")).toBeInTheDocument();
+      expect(screen.getByText("Item 3")).toBeInTheDocument();
+    });
+
+    it("should hide children when expand button is clicked twice", async () => {
+      const user = userEvent.setup();
+      render(SettingsGridTest);
+      const expandButton = screen.getByRole("button", { name: "Expand" });
+      await user.click(expandButton);
+      expect(screen.getByText("Item 1")).toBeInTheDocument();
+      await user.click(expandButton);
+      expect(screen.queryByText("Item 1")).not.toBeInTheDocument();
+    });
   });
 });
diff --git a/tests/unit/components/layout/SettingsGridTest.svelte b/tests/unit/components/layout/SettingsGridTest.svelte
index 09b5193..b676a98 100644
--- a/tests/unit/components/layout/SettingsGridTest.svelte
+++ b/tests/unit/components/layout/SettingsGridTest.svelte
@@ -1,8 +1,9 @@
 <script>
   import SettingsGrid from "$components/layout/SettingsGrid.svelte";
+  import Icon from "~icons/lucide/settings";
 </script>
 
-<SettingsGrid>
+<SettingsGrid label="Test Grid" icon={Icon}>
   <div data-testid="item1">Item 1</div>
   <div data-testid="item2">Item 2</div>
   <div data-testid="item3">Item 3</div>
diff --git a/tests/unit/states/imageConfig.test.ts b/tests/unit/states/imageConfig.test.ts
index f80dd93..17996d3 100644
--- a/tests/unit/states/imageConfig.test.ts
+++ b/tests/unit/states/imageConfig.test.ts
@@ -7,7 +7,7 @@ describe("imageState", () => {
   });
 
   it("should create new instance with default values", () => {
-    expect(imageState.fullImage).toBeNull();
+    expect(imageState.fullImage).toBe("");
     expect(imageState.croppedImage).toBeUndefined();
     expect(imageState.cropRect).toStrictEqual({ left: 0, top: 0, right: 0, bottom: 0 });
   });