diff --git a/res.jpg b/res.jpg
index 6c8d324..6aea73c 100644
Binary files a/res.jpg and b/res.jpg differ
diff --git a/src/IdPhotoBackgroundSwitch/IdPhotoHelper.php b/src/IdPhotoBackgroundSwitch/IdPhotoHelper.php
index 0828432..4631a79 100644
--- a/src/IdPhotoBackgroundSwitch/IdPhotoHelper.php
+++ b/src/IdPhotoBackgroundSwitch/IdPhotoHelper.php
@@ -10,10 +10,22 @@ class IdPhotoHelper
     static $ignore_piexl = 0.01; //像素横向左右存在该比例无需替换颜色的像素时，无效该像素替换
     static $distinct_piexl = 80; //rgb像素整体偏差范围
 
-    public static function transformImage(string $from_image_path, string $to_image_path, array $color = self::RED_COLOR)
+    /**
+     * 证件照背景颜色替换
+     * @param string $from_image_path //来源图片路径
+     * @param string $to_image_path //目标图片路径
+     * @param array|int[] $color //rgb颜色，示例:[255,0,0]
+     * @param array $return_size // 宽高，示例：[400,300]
+     * @author 我只想看看蓝天 <1207032539@qq.com>
+     */
+    public static function transformImage(string $from_image_path, string $to_image_path, array $color = self::RED_COLOR, array $return_size = [])
     {
         $old_image = imagecreatefromstring(file_get_contents($from_image_path));
-        list($old_image_width, $old_image_height) = getimagesize($from_image_path);//获取长和宽
+        if (!empty($return_size)) {
+            $old_image = self::resetImage($old_image, $return_size);
+        }
+        $old_image_width = imagesx($old_image);//获取长和宽
+        $old_image_height = imagesy($old_image);
         $new = imagecreatetruecolor($old_image_width, $old_image_height);//创建一个背景图
         $color = imagecolorallocate($new, $color[0] ?? 0, $color[1] ?? 0, $color[2] ?? 0);
         imagefill($new, 0, 0, $color);
@@ -98,4 +110,24 @@ private static function collectBackgroupColor($image)
         $b = $rgb & 0xff;//取B
         return [$r, $g, $b];
     }
+
+    /**
+     * 重置图片（可实现低损压缩）
+     * @param $image
+     * @param array $return_size //示例：[400,300] 宽高
+     * @return false|\GdImage|resource
+     * @author 我只想看看蓝天 <1207032539@qq.com>
+     */
+    private static function resetImage($image, $return_size = [])
+    {
+        $width = imagesx($image); //获取原图尺寸
+        $height = imagesy($image); //获取原图尺寸
+        //缩放尺寸
+        $new_width = $return_size[0] ?? $width;
+        $new_height = $return_size[1] ?? $height;
+        $dst_image = imagecreatetruecolor($new_width, $new_height);
+        imagecopyresized($dst_image, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
+        imagedestroy($image);
+        return $dst_image;
+    }
 }
diff --git a/tests/Test.php b/tests/Test.php
index bb375b1..a01c6d9 100644
--- a/tests/Test.php
+++ b/tests/Test.php
@@ -15,6 +15,6 @@ class Test extends TestCase
 {
     public function testIdPhotoHelper()
     {
-        IdPhotoHelper::transformImage('test.jpg', 'res.jpg');
+        IdPhotoHelper::transformImage('test.jpg', 'res.jpg', IdPhotoHelper::WHITE_COLOR, [413, 295]);
     }
 }