diff --git a/server.py b/server.py
index b22d75ca9..f5d3df988 100644
--- a/server.py
+++ b/server.py
@@ -493,7 +493,7 @@ class PromptServer():
                         )
                     
                     # 处理静态图像文件
-                    if channel == 'rgb' or channel == 'rgba':
+                    if channel == 'rgb':
                         with Image.open(file) as img:
                             if img.mode == "RGBA":
                                 r, g, b, a = img.split()
@@ -524,6 +524,32 @@ class PromptServer():
 
                             return web.Response(body=alpha_buffer.read(), content_type='image/png',
                                                 headers={"Content-Disposition": f"filename=\"{filename}\""})
+                    
+                    elif channel == 'rgba':
+                        with Image.open(file) as img:
+                            # 确保图像是 RGBA 模式
+                            if img.mode != 'RGBA':
+                                if img.mode == 'RGB':
+                                    # RGB -> RGBA（Alpha=255）
+                                    new_img = img.convert('RGBA')
+                                else:
+                                    # 其他模式（如 L/LA/P）-> RGBA
+                                    new_img = Image.new('RGBA', img.size, (0, 0, 0, 255))
+                                    new_img.paste(img, (0, 0), img)  # 保留原图的 Alpha（如果有）
+
+                            else:
+                                new_img = img  # 已经是 RGBA，无需转换
+
+                            # 保存为 PNG 并返回
+                            buffer = BytesIO()
+                            new_img.save(buffer, format='PNG')
+                            buffer.seek(0)
+                            return web.Response(
+                                body=buffer.read(),
+                                content_type='image/png',
+                                headers={"Content-Disposition": f"filename=\"{filename}\""}
+                            )
+                    
                     else:
                         # Get content type from mimetype, defaulting to 'application/octet-stream'
                         content_type = mimetypes.guess_type(filename)[0] or 'application/octet-stream'