diff --git a/core/core.php b/core/core.php
index 3681f61d..e11bc067 100644
--- a/core/core.php
+++ b/core/core.php
@@ -32,8 +32,11 @@ class common {
 	const FILE_DIR = 'site/file/';
 	const TEMP_DIR = 'site/tmp/';
 
+	// Miniatures de la gallery
+	const THUMBS_SEPARATOR = 'mini_';
+
 	// Numéro de version 
-	const ZWII_VERSION = '10.0.052';
+	const ZWII_VERSION = '10.0.053';
 	const ZWII_UPDATE_CHANNEL = "v10";
 
 	public static $actions = [];
@@ -781,9 +784,51 @@ class common {
 
 	}
 	
+	/*
+	* Création d'une miniature
+	* Fonction utilisée lors de la mise à jour d'une version 9 à une version 10
+	* @param string $src image source
+	* @param string $dets image destination
+	* @param integer $desired_width largeur demandée
+	*/
+
+	function makeThumb($src, $dest, $desired_width) {
+
+		$png = $jpg = false;
+		if (strpos($src,'jpg') > 0 ||
+			strpos($src,'jpeg') > 0 ) {
+				$jpg = true;
+		}
+		if (strpos($src,'png') > 0 )  {
+				$png = true;
+		}		
+		if ($png || $jpg ) {
+			/* read the source image */
+			$source_image = $jpg ? imagecreatefromjpeg($src) : imagecreatefrompng($src);
+			$width = imagesx($source_image);
+			$height = imagesy($source_image);
+		
+			/* find the "desired height" of this thumbnail, relative to the desired width  */
+			$desired_height = floor($height * ($desired_width / $width));
+		
+			/* create a new, "virtual" image */
+			$virtual_image = imagecreatetruecolor($desired_width, $desired_height);
+		
+			/* copy source image at a resized size */
+			imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
+		
+			/* create the physical thumbnail image to its destination */
+			if ($png) {
+				imagepng($virtual_image, $dest);
+			}
+			if ($jpg) {
+				imagejpeg($virtual_image, $dest);
+			}
+		}
+	}
 
 
-		/**
+	/**
 	 * Envoi un mail
 	 * @param string|array $to Destinataire
 	 * @param string $subject Sujet
@@ -1116,7 +1161,9 @@ class common {
 		// Version 10.0.00
 		if($this->getData(['core', 'dataVersion']) < 10000) {
 			$this->setData(['config', 'faviconDark','faviconDark.ico']);
-			// Numérotation des galeries
+
+			//----------------------------------------
+			// Mettre à jour les données des galeries
 			$pageList = array();
 			foreach ($this->getHierarchy(null,null,null) as $parentKey=>$parentValue) {
 				$pageList [] = $parentKey;
@@ -1142,18 +1189,32 @@ class common {
 						if ( $this->getdata(['module',$parent,$galleryKey,'config','homePicture']) === NULL)  {
 							$iterator = new DirectoryIterator($this->getdata(['module',$parent,$galleryKey,'config','directory']));
 							foreach($iterator as $fileInfos) {
-								if($fileInfos->isDot() === false AND $fileInfos->isFile() AND @getimagesize($fileInfos->getPathname())) {
+								if($fileInfos->isDot() === false AND $fileInfos->isFile() AND @getimagesize($fileInfos->getPathname())) {									
 									$this->setdata(['module',$parent,$galleryKey,'config','homePicture',$fileInfos->getFilename()]);
 									break;
+
 								}
 							}
 						}	
+						// Mise à jour de la taille des miniatures
+						$iterator = new DirectoryIterator($this->getdata(['module',$parent,$galleryKey,'config','directory']));
+						foreach($iterator as $fileInfos) {
+							if($fileInfos->isDot() === false AND $fileInfos->isFile() AND @getimagesize($fileInfos->getPathname())) {									
+								if (!file_exists( str_replace('source','thumb',$fileInfos->getPathname()) . '/' . self::THUMBS_SEPARATOR  . strtolower($fileInfos->getFilename()))) {
+									$this->makeThumb($fileInfos->getPathname(),
+													str_replace('source','thumb',$fileInfos->getPath()) .  '/' . self::THUMBS_SEPARATOR  . strtolower($fileInfos->getFilename()),
+													640);
+								}
+							}
+						}
 					}			
 				}
 			}	
-			$this->setData(['core', 'dataVersion', 10000]);	
-		}	
+			// Mettre à jour les données des galeries
+			//----------------------------------------
 
+			$this->setData(['core', 'dataVersion', 10000]);	
+		}
 	}
 }
 
diff --git a/module/gallery/gallery.php b/module/gallery/gallery.php
index a1d65380..3583e1c9 100644
--- a/module/gallery/gallery.php
+++ b/module/gallery/gallery.php
@@ -41,8 +41,6 @@ class gallery extends common {
 
 	public static $thumbs = [];
 
-	const THUMBS_SEPARATOR = 'mini_';
-
 	const GALLERY_VERSION = '2.0';