3. Fenêtres de dialogue relatives au contenu de l’image

3.1. Le sélecteur de couleur PP/AP

The Color dialog lets you pick and manage colors. There are several different modes you can use to select colors. It also offers a color picker to select a color anywhere on your screen.

This dialog works on either the foreground or the background color.

3.1.1. 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: WindowsDockable DialogsColors.

  • From the Tab menu in any dockable dialog by clicking the tab menu button and selecting Add TabColors.

  • From the toolbox: click on the current Foreground or Background color.

In the Windows menu, there is a list of detached windows which exists only if at least one dialog remains open. In this case, you can raise the « FG/BG » dialog from the main menu: WindowsFG/BG.

3.1.2. Utilisation du Dialogue des couleurs

The dialog offers a number of different color selector modes at the top:

GIMP

Figure 15.17. GIMP Color Selector

GIMP Color Selector

Avec ce sélecteur, vous choisissez une couleur en cliquant dans une bande colorée située sur le bord droit, puis sur une surface localisée à gauche. La bande colorée représente l’un des paramètres T, S, V, R, V ou B selon le bouton sur lequel vous avez cliqué. La surface représente alors les deux paramètres de couleur complémentaire.

CMJN

Figure 15.18. CMYK Color Selector

CMYK Color Selector

You get to this selector by clicking on the CMYK icon. The CMYK view gives you the possibility to manage colors from the CMYK color model. If a CMYK profile is attached to the image, the profile will be used to determine the CMYK colors. See Soft-Proof Profile for more information. Otherwise, a "naive" color conversion will be performed.

Le sélecteur Aquarelle

Figure 15.19. Aquarelle : Sélecteur de couleur

Aquarelle : Sélecteur de couleur

This selector is a little different than the other models. The principle consists in changing the current foreground color by clicking in the rectangular palette. If the current foreground color is for example white, then it turns reddish by clicking in the red color area. Repeated clicking strengthens the effect. With the slider, which is next to the color palette, you can set the color quantity per mouse click. The higher the sliding control is, the more color is taken up per click.

Wheel

Figure 15.20. Wheel Color Selector

Wheel Color Selector

This selector uses the TSV color model. Click in the chromatic circle and drag the mouse pointer to select the Hue. Click-and-drag in the triangle to vary the Saturation (vertically) and Value (horizontally).

Palette

Figure 15.21. Palette : Sélecteur de couleur

Palette : Sélecteur de couleur

This color selector brings up a list of the colors from the current palette in the Palettes dialog. You can set GIMP's foreground or background colors by clicking on colors in the colors display. You can also use the arrow keys to move within the list of colors.

Le sélecteur Échelles

Figure 15.22. Scales Color Selector

Scales Color Selector

This selector displays a global view of the R, G, B channels and either the H, S, V or L, c, h values, placed in sliders. The numbers can be represented as 0 to 255 or 0.0 to 100.0 ranges.

At the bottom, further options and tools are available:

Foreground and background color

The symbol consisting of two arrows allows you to exchange the foreground and background color. At the bottom left of this icon, below the foreground color block, you find a switching surface with two small, one black and the other white, partially overlapping squares. If you click on these, the front and background color are reset to black and white respectively.

Le sélecteur Pipette

The Color Dialog color picker has a completely different behavior than the color picker tool. Instead of picking the colors from the active image, you're able to pick colors from the entire screen.

The downside is that you get colors after they got processed by the full system color stack, in particular color management. It means that the resulting color values may end up different from ones returned by the color picker tool when picking over the canvas. It is up to you to make an informed choice of which color picker to use.

Notation HTML

This is a text field with six characters. See HTML notation. You can also use the CSS keywords; enter the first letter of a color to get a list of colors with their keyword:

Figure 15.23. Exemple de mots-clés CSS

Exemple de mots-clés CSS

Right-clicking in the HTML Notation text box opens a context menu that allows you to edit your notation, particularly to paste a complex notation you have copied elsewhere.

Last used colors

Twelve buttons at the bottom show the last used colors. You may choose a color by clicking on one of these buttons or add the current foreground or background color to this history list.