设置默认颜色为纯黑透明背景

SpineViewer/Exporter/ExportArgs.cs

@@ -72,7 +72,7 @@ namespace SpineViewer.Exporter
         [Editor(typeof(SFMLColorEditor), typeof(UITypeEditor))]
         [TypeConverter(typeof(SFMLColorConverter))]
         [Category("[0] 导出"), DisplayName("背景颜色"), Description("要使用的背景色, 格式为 #RRGGBBAA")]
-        public SFML.Graphics.Color BackgroundColor { get; set; } = new(0, 255, 0, 0);
+        public SFML.Graphics.Color BackgroundColor { get; set; } = SFML.Graphics.Color.Transparent;
 
         /// <summary>
         /// 检查参数是否合法并规范化参数值, 否则返回用户错误原因