Feat(SNT): ajoute le bilan sur les couleurs

SNT/02_Photographie_numerique/3B_couleur_metadonnees.tex

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+\documentclass[a4paper,10pt]{article}
+\usepackage{myXsim}
+
+\author{Benjamin Bertrand}
+\title{Image Numérique - Cours}
+\date{Décembre 2022}
+
+\pagestyle{empty}
+
+\begin{document}
+
+\maketitle
+
+
+\subsection*{Les couleurs - RGB}
+
+On a vu que les couleurs pouvait être décrites numériquement par 3 nombres, c'est le modèle RGB (red, green, blue).
+
+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.
+
+Voici quelques exemples de couleurs:
+\begin{center}
+    \includegraphics[scale=0.2]{./fig/roue_couleurs_255_corr}
+    \includegraphics[scale=0.2]{./fig/roue_couleurs_128_corr}
+\end{center}
+
+\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
+        \[
+            256\times 256\times 256 = \np{16777216}
+        \]
+        Ce que l'on nomme plus communément  16 millions de couleurs.
+
+\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.
+
+
+\section{Les métadonnées}
+
+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}.
+
+\begin{minipage}{0.6\textwidth}
+    \includegraphics[scale=0.3]{./fig/metadonnees}
+\end{minipage}
+\begin{minipage}{0.4\textwidth}
+    On y retrouve par exemple:
+    \begin{itemize}
+        \item Les dimensions
+        \item La date de prise de vue
+        \item La marque et le modèle de l'appareil photo
+        \item Les coordonnées gps si le GPS est activé.
+    \end{itemize}
+\end{minipage}
+
+
+
+
+\end{document}

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SNT/02_Photographie_numerique/index.rst

@@ -2,7 +2,7 @@ Photographie numérique
 ######################
 
 :date: 2022-11-16
-:modified: 2022-12-08
+:modified: 2023-01-09
 :authors: Benjamin Bertrand
 :tags: Photos numériques
 :category: SNT
@@ -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
+    :height: 200px
+    :alt: Bilan sur les couleurs et les métadonnées
+
+
 Étape 5: Métiers liés à l'image numérique
 -----------------------------------------