diff --git a/annotating_with_checks.py b/annotating_with_checks.py
index b2593c4..885acf7 100644
--- a/annotating_with_checks.py
+++ b/annotating_with_checks.py
@@ -5,6 +5,7 @@ import shutil
 import concurrent.futures
 import threading
 import img2pdf
+from reportlab.pdfgen import canvas
 
 # Fix for Matplotlib in threads: Set backend to non-interactive 'Agg'
 import matplotlib
@@ -226,16 +227,31 @@ def process_student(args):
         json.dump(final_json_map, f, indent=2)
 
 
-    # Pour éviter du drift
-    temp_img_path = os.path.join(output_dir, "Reference.jpg")
-    concat_img.save(temp_img_path, quality=90) # Save as standard image first
-    with open(os.path.join(output_dir, "Concat.pdf"), "wb") as f:
-        f.write(img2pdf.convert(temp_img_path))
+    # # Pour éviter du drift, avec img2pdf
+    # # Pb : Xournal can't add annotations
+    # temp_img_path = os.path.join(output_dir, "Reference.jpg")
+    # concat_img.save(temp_img_path, quality=90) # Save as standard image first
+    # with open(os.path.join(output_dir, "Concat.pdf"), "wb") as f:
+    #     f.write(img2pdf.convert(temp_img_path))
+
+
+    # Avec reportlab.pdfgen
+    # Au moins, le drift n'empire pas au fil de la copie
+    temp_img_path = os.path.join(output_dir, "Reference.jpg") # Can't use png here
+    concat_img.save(temp_img_path, quality=90)
+    pdf_path = os.path.join(output_dir, "Concat.pdf")
+    w, h = concat_img.size
+    c = canvas.Canvas(pdf_path, pagesize=(w, h))
+    c.drawImage(temp_img_path, 0, 0, width=w, height=h)
+    c.save()
 
     # Ancien code, avec du drift
     # concat_img.save(os.path.join(output_dir, "Concat.pdf"), "PDF", resolution=DPI)
     # concat_img.save(os.path.join(output_dir, "Reference.png"))
 
+    # Try to fix the drift with 72 DPI, non essayé
+    # concat_img.save(os.path.join(output_dir, "Concat.pdf"), "PDF", resolution=72.0)
+    # concat_img.save(os.path.join(output_dir, "Reference.jpg"))
 
 
 if __name__ == "__main__":