diff --git a/README.md b/README.md
index 2753219..3812c76 100755
--- a/README.md
+++ b/README.md
@@ -1139,7 +1139,7 @@ print(output_text)
 # Parse a single image
 python3 dots_ocr/parser.py demo/demo_image1.jpg
 # Parse a single PDF
-python3 dots_ocr/parser.py demo/demo_pdf1.pdf  --num_threads 64  # try bigger num_threads for pdf with a large number of pages
+python3 dots_ocr/parser.py demo/demo_pdf1.pdf  --num_thread 64  # try bigger num_threads for pdf with a large number of pages
 
 # Layout detection only
 python3 dots_ocr/parser.py demo/demo_image1.jpg --prompt prompt_layout_only_en
diff --git a/assets/wechat.jpg b/assets/wechat.jpg
index 6aecef3..b905d3c 100644
Binary files a/assets/wechat.jpg and b/assets/wechat.jpg differ
diff --git a/dots_ocr/parser.py b/dots_ocr/parser.py
index e351e87..1f1a1d8 100755
--- a/dots_ocr/parser.py
+++ b/dots_ocr/parser.py
@@ -190,7 +190,7 @@ class DotsOCRParser:
         
     def parse_pdf(self, input_path, filename, prompt_mode, save_dir):
         print(f"loading pdf: {input_path}")
-        images_origin = load_images_from_pdf(input_path)
+        images_origin = load_images_from_pdf(input_path, dpi=self.dpi)
         total_pages = len(images_origin)
         tasks = [
             {
diff --git a/requirements.txt b/requirements.txt
index a327bb4..7eed6f1 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
-# 生产环境依赖
 # streamlit 
 gradio
 gradio_image_annotation