diff --git a/dmriprep/qc.py b/dmriprep/qc.py
old mode 100755
new mode 100644
diff --git a/li2mni/make_mni_snapshot.py b/li2mni/make_mni_snapshot.py
new file mode 100644
index 0000000..41c1921
--- /dev/null
+++ b/li2mni/make_mni_snapshot.py
@@ -0,0 +1,110 @@
+import fire
+import os
+from nilearn import plotting
+from PIL import Image
+import shutil
+import pandas as pd
+
+
+def overlay_nifti(template_file, overlay_file, output_file,
+                  cmap='jet', dpi=900):
+    sub = template_file.split("sub-")[1].split("/ses")[0]
+    display = plotting.plot_anat(template_file, display_mode="ortho",
+                                 cut_coords=(-35, -18, -38),
+                                 title=f"sub-{sub}")
+    display.add_overlay(overlay_file, colorbar=True,
+                        cmap=cmap,
+                        alpha=0.4)
+    display.savefig(output_file, dpi=dpi)
+    display.close()
+
+
+def cohorte(li2mni_path, output_path, norm=False, site=False,
+            participants=None, pdf=True, dpi=900):
+    """
+    Launch overlay_nifti on a all cohorte.
+
+    Parameters
+    ----------
+    li2mni_path: str
+        path to the li2mni folder.
+    output_path: str
+        path to the destination folder.
+
+    Optionnal
+    ---------
+    norm: Bool default False
+        take the li2mni output normalized or not.
+    site: Bool default False
+        Reorder the png to a site by site.
+    participants: Bool default None
+        path to the participants.tsv file. WARNING this flags is mandatory if
+        site=True
+    pdf: Bool
+        make a concatenation pdf of site by site png, work only if site=True
+    dpi: int default=900
+        dot per inch of the png created.
+    """
+    list_sub = [i for i in os.listdir(li2mni_path) if i.startswith('sub')]
+    print(list_sub, len(list_sub))
+    for sub in list_sub:
+        template = f"{li2mni_path}/{sub}/ses-M03Li/li2mnianat.nii.gz"
+        if norm is False:
+            overlay = f"{li2mni_path}/{sub}/ses-M03Li/li2mni.nii.gz"
+            output = os.path.join(output_path, f"{sub}_overlay_mni")
+        else:
+            overlay = f"{li2mni_path}/{sub}/ses-M03Li/li2mninorm.nii.gz"
+            output = os.path.join(output_path, f"{sub}_overlay_mni_norm")
+
+        if os.path.isfile(template) and os.path.isfile(overlay)\
+           and os.path.isfile(output+".png") is False:
+            print("la")
+            print(os.path.isfile(output))
+            print(output)
+            overlay_nifti(template, overlay, output, dpi=dpi)
+
+    if site is True and participants is not None:
+        participants = pd.read_csv(participants, sep="\t")
+        path = output_path
+        list_png = [f for f in os.listdir(path) if f.startswith("sub-")]
+        liste_site = []
+        for png in list_png:
+            sub = png.split("_")[0]
+            site = int(participants["ses-M00_center"]
+                       [participants["participant_id"] == sub].values[0])
+            site = str(site)
+            os.makedirs(os.path.join(path, f"site-{site}"), exist_ok=True)
+
+            file_to_check = os.path.join(path,
+                                         f"site-{site}",
+                                         png.replace("_over",
+                                                     f"_site-{site}_over"))
+            if os.path.isfile(file_to_check) is False:
+                shutil.copy2(os.path.join(path, png), file_to_check)
+            liste_site.append(site)
+        print('cp done')
+        if pdf:
+            for site in set(liste_site):
+                images = []
+                path_site = os.path.join(path, f"site-{site}")
+                for image in os.listdir(path_site):
+                    if image.startswith("sub"):
+                        png = Image.open(os.path.join(path_site, image))
+                        png.load()
+                        background = Image.new("RGB",
+                                               png.size,
+                                               (255, 255, 255))
+                        background.paste(png, mask=png.split()[3])
+                        images.append(background)
+
+                pdf_path = os.path.join(path,
+                                        f"site-{site}",
+                                        f"recap_site-{site}.pdf")
+                images[0].save(pdf_path, "PDF", resolution=100.0,
+                               save_all=True,
+                               append_images=images[1:])
+                print(pdf_path)
+
+
+if __name__ == "__main__":
+    fire.Fire(cohorte)