Feat(SNT): ajoute le bilan sur les couleurs
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\documentclass[a4paper,10pt]{article}
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\usepackage{myXsim}
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\author{Benjamin Bertrand}
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\title{Image Numérique - Cours}
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\date{Décembre 2022}
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\pagestyle{empty}
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\begin{document}
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\maketitle
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\subsection*{Les couleurs - RGB}
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On a vu que les couleurs pouvait être décrites numériquement par 3 nombres, c'est le modèle RGB (red, green, blue).
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Avec le matériel récent, le plus commun est d'attribuer 1octet (ou encore 8bits) à chaque couleurs. Les couleurs sont donc décrites par 3 octets que l'on représente pas 3 nombres entre 0 et 255.
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Voici quelques exemples de couleurs:
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\begin{center}
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\includegraphics[scale=0.2]{./fig/roue_couleurs_255_corr}
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\includegraphics[scale=0.2]{./fig/roue_couleurs_128_corr}
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\end{center}
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\textbf{Nombre de couleurs possibles:} Il y a 256 niveaux de rouge, 256 niveaux de vert et 256 niveau de bleu. On a donc en tout
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\[
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256\times 256\times 256 = \np{16777216}
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\]
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Ce que l'on nomme plus communément 16 millions de couleurs.
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\paragraph{Remarque:} Il existe d'autres modèles pour décrire les couleurs qui fonctionnent sur le même principe mais qui ne sont pas basé sur les couleurs primaires. On peut citer TSB ou TSV.
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\section{Les métadonnées}
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Un fichier contenant une image ne continent pas uniquement la couleur de chaque pixel. Il contient aussi des données qui permettent de décrire le contexte dans lequel l'image a été prise. Ce sont les \textbf{métadonnées}.
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\begin{minipage}{0.6\textwidth}
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\includegraphics[scale=0.3]{./fig/metadonnees}
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\end{minipage}
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\begin{minipage}{0.4\textwidth}
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On y retrouve par exemple:
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\begin{itemize}
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\item Les dimensions
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\item La date de prise de vue
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\item La marque et le modèle de l'appareil photo
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\item Les coordonnées gps si le GPS est activé.
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\end{itemize}
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\end{minipage}
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\end{document}
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@ -2,7 +2,7 @@ Photographie numérique
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######################
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:date: 2022-11-16
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||||
:modified: 2022-12-08
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||||
:modified: 2023-01-09
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||||
:authors: Benjamin Bertrand
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:tags: Photos numériques
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:category: SNT
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||||
|
|
@ -77,6 +77,13 @@ Bilan: image NB, niveau de gris
|
|||
- Recherche des lieux de prise de vu
|
||||
- Modification des métadonnées d'une image
|
||||
|
||||
Bilan:
|
||||
|
||||
.. image:: ./3B_couleur_metadonnees.pdf
|
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:height: 200px
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:alt: Bilan sur les couleurs et les métadonnées
|
||||
|
||||
|
||||
Étape 5: Métiers liés à l'image numérique
|
||||
-----------------------------------------
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue