3. Finestre relative al contenuto dell'immagine
| Capitolo 15. Finestre |

## 3. Finestre relative al contenuto dell'immagine

### 3.1. La finestra di dialogo «Colore PP/SF»

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. Attivazione della finestra

Questa finestra di dialogo è di tipo agganciabile; vedere la sezione sulle Finestre agganciabili per le istruzioni su come gestire questo tipo di finestre.

È accessibile:

- From the main menu: Windows → Dockable Dialogs → Colors.

- From the Tab menu in any dockable dialog by clicking the tab menu button and selecting Add Tab → Colors.

- 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: Windows → FG/BG.

#### 3.1.2. Uso del pannello «colore di PP/SF»

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

GIMP

  Figura 15.17. GIMP Color Selector

  Con il selettore di colore di GIMP, si seleziona un colore facendo clic su una striscia monodimensionale posizionata presso il bordo destro della finestra, e in un'area bidimensionale situata invece sulla sinistra. La striscia monodimensionale codifica uno qualsiasi dei parametri di colore H, S, V, R, G, o B, in base a quale pulsante corrispondente situato nei pressi della striscia venga premuto. L'area bidimensionale codifica invece i due parametri di colore complementari.

Campionamento diffuso

  Figura 15.18. 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.

Acquarelli

  Figura 15.19. Aquarelli : Selettore di colore

  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

  Figura 15.20. Wheel Color Selector

  This selector uses the HSV 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).

Tavolozza

  Figura 15.21. Tavolozza : Selettore di colore

  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.

Scale

  Figura 15.22. 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.

Prelievo colore

  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.

  Il rovescio della medaglia è che si ottengono i colori dopo che sono stati elaborati dalla pila di colori dell'intero sistema, in particolare la gestione del colore. Significa che i valori di colore risultanti potrebbero risultare diversi da quelli restituiti dallo strumento di selezione dei colori quando si passa sopra l'area di disegno. Sta a voi fare una scelta informata di quale selettore di colori da usare.

Notazione 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:

  Figura 15.23. Esempio di parolechiavi 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.

2.7. Finestra cronologia annullamenti |  | 3.2. Finestra di dialogo pennelli

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