diff --git a/Convention photos/traitements/rphoto b/Convention photos/traitements/rphoto
index a185b8a..ff834d0 100755
--- a/Convention photos/traitements/rphoto	
+++ b/Convention photos/traitements/rphoto	
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash 
 
 checkcommand()
 {
@@ -17,62 +17,65 @@ checkcommand()
 
 help()
 {
-    echo "Usage:"
-    echo "    tphoto -h              Display help."
-    echo "    tphoto                 Rename jpg files from current directory with Exif datetime."
-    echo "    tphoto *.jpg           Rename files in parameter with Exif datetime."
-    echo "    tphoto -f              Rename jpg files from current directory with Exif datetime or file datetime."
-    echo "    tphoto -f *.jpg        Rename files in parameter with Exif datetime or file datetime."
+    echo "Usage:    tphoto [-n] [ -h | -f ] [ *.jpg ]"    
+    echo "Rename jpg files using Exif Original Date/Time if exists."
+    echo "    -h            Display help."
+    echo "    -f            Force rename jpg files with Exif datetime or file datetime."
+    echo "    -n            Dry run."
 }
 
-renameFromDirectoryWithExifOnly()
+doRename()
 {
-    find . -maxdepth 1 -type f -iname "*.jpg" | while read path
-    do
-        filename=$(basename $path)
-        #echo "$filename"
-        if [[ $(jhead $filename | grep -c Date) == 1 ]]; then
-            #echo "yop $filename"
-            jhead -nIMG%Y%m%d-%H%M%S "$filename"
-        else
-            echo "$filename IGNORED"
-        fi
-    done
+    local filename=$(basename $1)
+    #echo "$filename"
+    jhead -nIMG%Y%m%d-%H%M%S "$filename"
 }
 
-renameFromDirectory()
+doRenameCarefully()
 {
-    find . -maxdepth 1 -type f -iname "*.jpg" | while read path
-    do
-        filename=$(basename $path)
-        #echo "$filename"
-        jhead -nIMG%Y%m%d-%H%M%S "$filename"
-    done
+    local filename=$(basename $1)
+    #echo "$filename"
+    if [[ $(exiftool $filename | grep -c "Date/Time Original") > 0 ]]; then
+        #echo "yop $filename"
+        doRename "$filename"
+    else
+        echo "$filename IGNORED"
+    fi
 }
 
-
 # main
+checkcommand "exiftool"
+if [[ $? == 0 ]]; then
+    exit 1
+else
+    checkcommand "jhead"
+    if [[ $? == 0 ]]; then
+        exit 1
+    fi
+fi
+    
+
 if [[ $# == 0 ]]; then
-    renameFromDirectoryWithExifOnly
+    find . -maxdepth 1 -type f -iname "*.jpg" | while read path
+    do
+        doRenameCarefully "$path"
+    done
 elif [[ "$1" == "-h" ]]; then
     help
 elif [[ "$1" == "-f" && $# == 1 ]]; then
-    renameFromDirectory
+    find . -maxdepth 1 -type f -iname "*.jpg" | while read path
+    do
+        doRename "$path"
+    done
 elif [[ "$1" == "-f" && $# > 1 ]]; then
     for filename do
         if [[ "$filename" != "-f" ]]; then
-            #echo "$filename"
-            jhead -nIMG%Y%m%d-%H%M%S "$filename"
+            doRename "$filename"
         fi
     done
 else
     for filename do
-        #echo "$filename"
-        if [[ $(jhead $filename | grep -c Date) == 1 ]]; then
-            #echo "yop $filename"
-            jhead -nIMG%Y%m%d-%H%M%S "$filename"
-        else
-            echo "$filename IGNORED"
-        fi
+            doRenameCarefully "$filename"
     done
 fi
+