diff --git a/src/claviska/SimpleImage.php b/src/claviska/SimpleImage.php
index 3379467..7c95316 100644
--- a/src/claviska/SimpleImage.php
+++ b/src/claviska/SimpleImage.php
@@ -63,7 +63,7 @@ public function __construct($image = '', $flags = []) {
     $this->flags = [
       "sslVerify" => true // Skip SSL peer validation
     ];
-    
+
     // Override default flag values.
     foreach($flags as $flag => $value) {
       $this->setFlag($flag, $value);
@@ -206,7 +206,7 @@ public function fromFile($file) {
         $alpha = imagecolorallocatealpha($gif, 0, 0, 0, 127);
         imagecolortransparent($gif, $alpha);
         imagefill($gif, 0, 0, $alpha);
-        
+
         imagecopy($this->image, $gif, 0, 0, 0, 0, $width, $height);
         imagedestroy($gif);
         break;
@@ -526,7 +526,7 @@ protected static function imageCopyMergeAlpha($dstIm, $srcIm, $dstX, $dstY, $src
     if($pct < 100) {
       // Disable alpha blending and "colorize" the image using a transparent color
       imagealphablending($srcIm, false);
-      imagefilter($srcIm, IMG_FILTER_COLORIZE, 0, 0, 0, 127 * ((100 - $pct) / 100));
+      imagefilter($srcIm, IMG_FILTER_COLORIZE, 0, 0, 0, round(127 * ((100 - $pct) / 100)));
     }
 
     imagecopy($dstIm, $srcIm, (int) $dstX, (int) $dstY, (int) $srcX, (int) $srcY, (int) $srcW, (int) $srcH);