fix: Gallery

app.py

@@ -118,7 +118,13 @@ def fine_grained_update(fine_grained_type):
 
 with gr.Blocks() as demo:
     pdf_input = gr.File(label="上传PDF文件")
-    image_gallery = gr.Gallery(label="PDF页面预览", columns=3, height="300")
+    image_gallery = gr.Gallery(
+        label="PDF页面预览",
+        columns=3,
+        height=300,
+        object_fit="contain",  # 添加这个参数
+        preview=True,  # 添加这个参数
+    )
     selected_index = gr.State(None)
     pdf_input.upload(fn=process_pdf, inputs=pdf_input, outputs=image_gallery)
     image_gallery.select(fn=on_image_select, inputs=[], outputs=selected_index)