### 7.7. Points d’échantillonnage

While the Color Picker can display color information about one pixel, the « Sample Points » dialog can display the data of four pixels of the active layer or the image, at the same time. Another important difference is that the values of these points are changed in real time as you are working on the image.

#### 7.7.1. Accès au dialogue

La fenêtre du Presse-papiers est une fenêtre ancrable, voyez la section Dialogues, fenêtres et onglets sur l’utilisation des ancrages.

Vous pouvez y accéder :

- from the main menu: Windows → Dockable Dialogs → Sample Points.

- from the Tab menu in any dockable dialog by clicking the tab menu button and selecting Add Tab → Sample Points.

#### 7.7.2. Utilisation des points d’échantillonnage

To create a sample point, Ctrl-click on one of the two measure rulers of the image window and drag the mouse pointer. Two perpendicular guides appear. The sample point is where both guides intersect. You can see its coordinates in the lower left corner of the status area at the bottom. Release the mouse button.

The image shows four already defined sample points and the reticle when you press Ctrl on a measure ruler and then click and drag.

Sample points are shown as a round mark with an order number. You can hide these marks by unchecking View → Show Sample Points in the main menu.

The « Sample Points » dialog does not automatically open when you create a sample point.

Pour déplacer ou supprimer un point d’échantillonnage :

- Using the Color Picker tool, click-and-drag the sample point up to a measure ruler to delete it.

- Using a paint tool, Ctrl + click-and-drag the sample point up to a measure ruler to delete it.

By default, sampling is performed on all layers. If you want to sample on the active layer only, uncheck Sample Point Menu → Sample Merged from the tab menu.

#### 7.7.3. Description du dialogue « Points d’échantillonnage »

Figure 15.112. La fenêtre Points d’échantillonnage

Information about all sample points is displayed in this window.

La couleur du pixel échantillonné est affichée dans une boîte d’échantillon.

Dans la liste déroulante, vous pouvez choisir entre :

Pixel

  Cette option donne les valeurs Rouge, Vert, Bleu et Alpha du pixel, entre 0 et 255.

RGB (%)

  Ce sont les valeurs du canal RVB : le Rouge, le Vert, le Bleu et l’Alpha . Affiche aussi la valeur hexadécimale de la couleur du pixel.

RGB (0..255)

  This choice displays the Red, Green, Blue and Alpha values of the pixel, as hexadecimal values. It also shows the hexadecimal value of the pixel's color.

Grayscale (%)

TSV

  Affiche la Teinte, en degrés, ainsi que la Saturation, la Valeur et l’Alpha du pixel, en pourcentages.

CIE LCh

CIE LAB

CIE xyY

CIE Yu'v'

CMJN

  Affiche les valeurs du Cyan, du Magenta, du Jaune, du Noir et de l’ Alpha du pixel, en pourcentages.

Data are supplied for every channel in the chosen color model. The Alpha is present only if the image has an Alpha channel.

Hex appears only when one of the RGB modes is selected. It displays the hexadecimal code of the HTML Notation.

7.6. Tableau de bord |  | 7.8. Pointeur

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