diff --git a/src/parser/decomposeColor.ts b/src/parser/decomposeColor.ts
index bc05879..394a9de 100644
--- a/src/parser/decomposeColor.ts
+++ b/src/parser/decomposeColor.ts
@@ -12,6 +12,7 @@ import { parseHsla } from './parseHsla';
 import { parseLch } from './parseLch';
 import { parseXyz } from './parseXyz';
 import { parseNamedColor } from './parseNamedColor';
+import {parseHexAlpha} from "@/parser/parseHexAlpha";
 
 /**
  * Converts any valid color format to RGB.
@@ -24,19 +25,26 @@ export function decomposeColor(color: string): { r: number; g: number; b: number
     const format = detectColorFormat(color);
 
     switch (format) {
-        case 'hex':
-        case 'hex-alpha': {
+        case 'hex': {
             return hexToRgb(color, false);
         }
 
+        case 'hex-alpha': {
+            const rgb = parseHexAlpha(color);
+            return { r: rgb[0], g: rgb[1], b: rgb[2], a: rgb[3] };
+        }
+
         case 'hsl': {
             const [h, s, l] = parseHsl(color);
             return hslToRgb(h, s, l, false);
         }
 
         case 'hsla': {
-            const [hslaH, hslaS, hslaL] = parseHsla(color);
-            return hslToRgb(hslaH, hslaS, hslaL, false);
+            const [hslaH, hslaS, hslaL, hslaA] = parseHsla(color);
+            const rgb = hslToRgb(hslaH, hslaS, hslaL, false);
+            return {
+                r: rgb.r, g: rgb.g, b: rgb.b, a: hslaA,
+            }
         }
 
         case 'lab': {
diff --git a/tests/parser/decomposeColor.test.ts b/tests/parser/decomposeColor.test.ts
index 7c44722..6f8390f 100644
--- a/tests/parser/decomposeColor.test.ts
+++ b/tests/parser/decomposeColor.test.ts
@@ -1,29 +1,43 @@
 import { decomposeColor } from '@/parser/decomposeColor';
 
 describe('decomposeColor', () => {
-    test('converts hex to rgb', () => {
+    test('decomposes HEX color', () => {
         expect(decomposeColor('#ff0000')).toEqual({ r: 255, g: 0, b: 0 });
-        expect(decomposeColor('#00ff00')).toEqual({ r: 0, g: 255, b: 0 });
     });
 
-    test('converts hsl to rgb', () => {
+    test('decomposes HEX-ALPHA color', () => {
+        expect(decomposeColor('#ff000080')).toEqual({ r: 255, g: 0, b: 0, a: 0.502 });
+    });
+
+    test('decomposes HSL color', () => {
         expect(decomposeColor('hsl(0, 100%, 50%)')).toEqual({ r: 255, g: 0, b: 0 });
-        expect(decomposeColor('hsl(120, 100%, 50%)')).toEqual({ r: 0, g: 255, b: 0 });
     });
 
-    test('converts lab to rgb', () => {
-        expect(decomposeColor('lab(53.23 80.09 67.2)')).toEqual({ r: 255, g: 0, b: 0 });
+    test('decomposes HSLA color', () => {
+        expect(decomposeColor('hsla(0, 100%, 50%, 0.5)')).toEqual({ r: 255, g: 0, b: 0, a: 0.5 });
     });
 
-    test('converts lch to rgb', () => {
-        expect(decomposeColor('lch(53.23 104.55 40.00)')).toEqual({ r: 255, g: 0, b: 0 });
+    test('decomposes LAB color', () => {
+        expect(decomposeColor('lab(53.23288 80.10933 67.2201)')).toEqual({ r: 255, g: 0, b: 0 });
     });
 
-    test('converts xyz to rgb', () => {
+    test('decomposes LCH color', () => {
+        expect(decomposeColor('lch(53.23288 104.551 40.0)')).toEqual({ r: 255, g: 0, b: 0 });
+    });
+
+    test('decomposes XYZ color', () => {
         expect(decomposeColor('xyz(41.24, 21.26, 1.93)')).toEqual({ r: 255, g: 0, b: 0 });
     });
 
-    test('converts named color to rgb', () => {
+    test('decomposes RGB color', () => {
+        expect(decomposeColor('rgb(255, 0, 0)')).toEqual({ r: 255, g: 0, b: 0 });
+    });
+
+    test('decomposes RGBA color', () => {
+        expect(decomposeColor('rgba(255, 0, 0, 0.5)')).toEqual({ r: 255, g: 0, b: 0, a: 0.5 });
+    });
+
+    test('decomposes named color', () => {
         expect(decomposeColor('red')).toEqual({ r: 255, g: 0, b: 0 });
     });
 
@@ -31,3 +45,4 @@ describe('decomposeColor', () => {
         expect(() => decomposeColor('invalid-color')).toThrow('Invalid color format invalid-color');
     });
 });
+