diff --git a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
index b359fb32e..f55db59e3 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
@@ -52,9 +52,8 @@ async fn raw_extract_inner(
         .ok_or_else(|| "界面图 data URL 无效".to_string())?;
     let mime = mime
         .strip_prefix("data:")
-        .and_then(|value| value.strip_suffix(";base64"))
-        .unwrap_or("image/png");
-    let is_png = mime.eq_ignore_ascii_case("image/png");
+        .and_then(|value| value.strip_suffix(";base64"));
+    let is_png = mime.is_some_and(|value| value.eq_ignore_ascii_case("image/png"));
     let image_bytes = base64::engine::general_purpose::STANDARD
         .decode(data.trim())
         .map_err(|error| format!("解码源图失败：{error}"))?;