Clamp RGB values

When brightening an image, color values from getpoint() can be over 255

src/Color.php

@@ -70,9 +70,9 @@ public function initFromArray($value)
             $alpha = $this->alpha2vips($array[2]);
         }
 
-        $this->red = (int) $red;
-        $this->green = (int) $green;
-        $this->blue = (int) $blue;
+        $this->red = $this->clampValue($red);
+        $this->green = $this->clampValue($green);
+        $this->blue = $this->clampValue($blue);
         $this->alpha = $alpha;
     }
 
@@ -221,4 +221,14 @@ protected function alpha2vips($input): int
 
         return (int) ceil($input * 255);
     }
+
+    /**
+     * @param $value
+     *
+     * @return int
+     */
+    protected function clampValue($value): int
+    {
+        return (int) min(255, $value);
+    }
 }