feat（新功能）:

fix（修复bug）:  模特新增后处理，保持输入图片size
docs（文档变更）:
refactor（重构）:
test(增加测试):

app/service/mannequins_edit/service.py

@@ -1,5 +1,6 @@
 import cv2
 import numpy as np
+from PIL import Image
 from minio import Minio
 
 from app.core.config import MINIO_URL, MINIO_ACCESS, MINIO_SECRET, MINIO_SECURE
@@ -34,6 +35,40 @@ class MannequinEditService():
         req = oss_upload_image(oss_client=minio_client, bucket=self.bucket_name, object_name=f"{self.mannequin_name}.png", image_bytes=image_bytes)
         return req.bucket_name + "/" + req.object_name
 
+    def post_processing(self, image):
+        # 原始图片的尺寸
+        original_width, original_height = image.size
+
+        # 计算宽度和高度的缩放比例
+        width_ratio = self.w / original_width
+        height_ratio = self.h / original_height
+
+        # 选择较小的缩放比例，确保图片能完整放入目标图片中
+        scale_ratio = min(width_ratio, height_ratio)
+
+        # 计算调整后的尺寸
+        new_width = int(original_width * scale_ratio)
+        new_height = int(original_height * scale_ratio)
+
+        # 调整图片大小
+        resized_image = image.resize((new_width, new_height))
+
+        # 创建一个 512x768 的透明图片
+        result_image = Image.new("RGBA", (self.w, self.h), (255, 255, 255, 0))
+
+        # 计算需要粘贴的位置，使图片居中
+        x_offset = (self.w - new_width) // 2
+        y_offset = (self.h - new_height) // 2
+
+        # 将调整大小后的图片粘贴到透明图片上
+        if resized_image.mode == "RGBA":
+            result_image.paste(resized_image, (x_offset, y_offset), mask=resized_image.split()[3])
+        else:
+            result_image.paste(resized_image, (x_offset, y_offset))
+
+        image = np.array(result_image)
+        return image
+
     def resize_leg(self, top, bottom):
         # 上部
         top_part = self.bgr[:top, :]
@@ -62,6 +97,7 @@ class MannequinEditService():
             new_image = np.dstack((new_bgr, new_bgr_alpha))
         else:
             new_image = new_bgr
+        new_image = self.post_processing(Image.fromarray(new_image))
         return new_image