Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/lang.php on line 32

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/acces.php on line 38

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/acces.php on line 39

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/acces.php on line 40

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/flock.php on line 60

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 560

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 561

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 609

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/filtres.php on line 619

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/flock.php on line 60

Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 1419

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 277

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 278

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 281

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 305

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 312

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 323

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 277

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 278

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 281

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 305

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 312

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 323

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 277

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 278

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 281

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 305

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 312

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 323

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 277

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 278

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 281

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 305

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 312

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 323

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 277

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 278

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 281

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 305

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 312

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 323

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 277

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 278

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 281

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 305

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 312

Deprecated: Function ereg_replace() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/texte.php on line 323

Warning: Illegal string offset 'statut' in /homepages/41/d147613458/htdocs/tech-tice/plugins/crayons/tetecrayons.php on line 10
Insertion d’image : une procédure personnelle erronée gourmande
+ Accueil du site > I. Fiches pratiques > 1.3. Produire / Créer / Publier > 1.3.1. Documents > Images

Insertion d’image : une procédure personnelle erronée gourmande

Mis en ligne le 18/05/2007

Contexte pédagogique : On m’appelle pour résoudre un problème “insoluble”.
- Un élève met une photo jpeg de 200 ko dans un document MS Word de 400 ko.
- Sa clé USB a encore 2Mo de libre,
- Word lui interdit d’enregistrer le document sur la clé : espace plein !

Une procédure personnelle

- Vérifions l’espace libre sur la clé : il reste effectivement 2Mo de libre,
- Enregistrons le document sur le bureau : il pèse 4Mo !!!

Comment l’insertion d’une photo de 200 ko peut-elle augmenter d’autant le poids d’un simple document word ? Un bug ?

Je fais moi-même l’insertion... Le fichier pèse normalement 600 ko.

Je demande alors à l’élève de me montrer sa procédure :
- Il ouvre l’image de 200 ko en double-cliquant dessus : elle s’ouvre dans Imaging, logiciel Microsoft de visualisation ;
- CTRL+A : il sélectionne toute l’image ;
- CTRL+C : il copie l’image dans le presse-papier ;
- Il ouvre ensuite son document Word de 400 ko et colle (CTRL+V) son image ;
- L’image est bien insérée dans Word ;
- Mais le fichier enregistré pèse 4 Mo.

Que s’est-il passé ?

Pratiquement, l’élève a utilisé une procédure personnelle, qui est d’ailleurs la procédure experte pour copier du texte (utilisation des raccourcis & rapidité d’exécution).

Le format JPEG est un format compressé : un algorithme permet de réduire le nombre d’octets nécessaire pour stocker les informations des pixels (position, couleur RBV,...) dans le fichier image.
Mais à l’ouverture du fichier, un algorithme réciproque redéploie les pixels, l’image est décompressée. C’est ainsi que fonctionnent les logiciels de manipulation d’images :

- Taille sur le disque : c’est le poids du fichier-image,
- Mémoire actuelle : c’est la place mémoire utilisée pour afficher à l’écran l’image décompressée, approximativement le poids du fichier NON COMPRESSÉ !

Aussi, copier tous les pixels de l’image dans le presse-papiers (CTRL+A puis CTR+C) revient à copier une image non compressée ! D’où l’inflation logique du poids du fichier.

La procédure experte

Dans Word, comme dans la plupart des logiciels qui le permettent, l’incorporation d’image dans le document se fait par la commande Insérer (ou Importer) :

- Ouvrir le document Word,
- Insérer l’image :

  • Commande Insertion > Image > À parti du fichier...,
  • Bouton Insérer de la barre d’outils Dessin (à savoir faire afficher),

- Techniquement, le fichier image est encapsulé dans le fichier word : l’image qui apparaît est bien stockée de manière compressée !

L’exemple est intéressant : il illustre parfaitement l’utilisation d’une mauvaise solution personnelle qui n’aurait pas été diagnostiquée sans le problème de capacité de stockage.

Version à imprimer

FORUM


Répondre à cet article
Deprecated: Function ereg() is deprecated in /homepages/41/d147613458/htdocs/tech-tice/ecrire/inc/flock.php on line 60
Creative Commons License
Le contenu de ce site est mis à disposition par Christophe Coubret sous un contrat Creative Commons. | Site réalisé avec SPIP
Ce site respecte la charte de l'anneau Sitinstit