diff --git a/src/core/change-brightness.js b/src/core/change-brightness.js
index aff6b21..b4dd007 100644
--- a/src/core/change-brightness.js
+++ b/src/core/change-brightness.js
@@ -11,12 +11,12 @@ function changeBrightness(pixelArray, factor) {
         return pixelArray;
     for (let i = 0; i < pixelArray.length; i += 4) {
         const hsl = utils.rgbToHsl(pixelArray[i], pixelArray[i + 1], pixelArray[i + 2]);
-        hsl[2] = Math.max(0, Math.min(100, hsl[2] += factor));
-        const rgb = utils.hslToRgb(hsl[0], hsl[1], hsl[2]);
+        hsl.l = Math.max(0, Math.min(100, hsl.l += factor));
+        const rgb = utils.hslToRgb(hsl.h, hsl.s, hsl.l);
 
-        pixelArray[i] = rgb[0];
-        pixelArray[i + 1] = rgb[1];
-        pixelArray[i + 2] = rgb[2];
+        pixelArray[i] = rgb.r;
+        pixelArray[i + 1] = rgb.g;
+        pixelArray[i + 2] = rgb.b;
     }
     return pixelArray;
 }
diff --git a/src/core/change-saturation.js b/src/core/change-saturation.js
index 4fbb1e9..daa0446 100644
--- a/src/core/change-saturation.js
+++ b/src/core/change-saturation.js
@@ -10,13 +10,13 @@ function changeSaturation(pixelArray, factor) {
     if (factor == 0)
         return pixelArray;
     for (let i = 0; i < pixelArray.length; i += 4) {
-        const hsl = utils.rgbToHsl(pixelArray[i], pixelArray[i + 1], pixelArray[i + 2]);
-        hsl[1] = Math.max(0, Math.min(100, hsl[1] += factor));
-        const rgb = utils.hslToRgb(hsl[0], hsl[1], hsl[2]);
+        let hsl = utils.rgbToHsl(pixelArray[i], pixelArray[i + 1], pixelArray[i + 2]);
+        hsl.s = Math.max(0, Math.min(100, hsl.s += factor));
+        const rgb = utils.hslToRgb(hsl.h, hsl.s, hsl.l);
 
-        pixelArray[i] = rgb[0];
-        pixelArray[i + 1] = rgb[1];
-        pixelArray[i + 2] = rgb[2];
+        pixelArray[i] = rgb.r;
+        pixelArray[i + 1] = rgb.g;
+        pixelArray[i + 2] = rgb.b;
     }
     return pixelArray;
 }
diff --git a/src/editpix.js b/src/editpix.js
index b0d0205..47fc044 100644
--- a/src/editpix.js
+++ b/src/editpix.js
@@ -99,6 +99,10 @@ EditPix.prototype.getHigherContrast = (color) => {
 }
 
 EditPix.prototype.rgbToHex = (r, g, b) => {
+    if (r < 0 || r > 255 ||
+        g < 0 || g > 255 ||
+        b < 0 || b > 255)
+        throw new Error("RGB format is invalid.");
     return utils.rgbToHex(r, g, b);
 }
 
@@ -148,10 +152,18 @@ EditPix.prototype.changeBrightness = (image, factor) => {
 }
 
 EditPix.prototype.rgbToHsl = (r, g, b) => {
+    if (r < 0 || r > 255 ||
+        g < 0 || g > 255 ||
+        b < 0 || b > 255)
+        throw new Error("RGB format is invalid.");
     return utils.rgbToHsl(r, g, b);
 }
 
 EditPix.prototype.hslToRgb = (h, s, l) => {
+    if (h < 0 || h > 360 ||
+        s < 0 || s > 100 ||
+        l < 0 || l > 100)
+        throw new Error("HSL format is invalid.");
     return utils.hslToRgb(h, s, l);
 }