3. Image-content Related Dialogs

3.1. FG/BG Color Dialog

The Color dialog lets you manage and pick up new colors. You can use it in several different modes. It also offers a color picker to select a color anywhere on your screen.

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

3.1.1. Aktivace dialogu

This dialog is a dockable dialog; see the section 2.3 – „Dokování dialogů“ for help on manipulating it.

You can access it:

  • from the main menu: WindowsDockable DialogsColors;

  • from the Tab menu in any dockable dialog by clicking on and selecting Add TabColors,

  • z Panelu nástrojů: klikněte na barvu popředí či pozadí.

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 Colors dialog from the main menu: WindowsColors.

3.1.2. Using the FG/BG color dialog

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

GIMP

Obrázek 15.17. GIMP Color Selector

GIMP Color Selector

Volič barev GIMP umožňuje výběr libovolné barvy kliknutím do jednorozměrného proužku vpravo a následným kliknutím do dvojrozměrné plochy vlevo. Jednorozměrný proužek umožňuje volit jeden z parametrů barvy (odstín, sytost, hodnota, červená, modrá, zelená), jak zvolíte kliknutím na některé z tlačítek v pravé části dialogu. Dvojrozměrná plocha pak umožňuje zvolit zbývající dva doplňkové parametry.

CMYK

Obrázek 15.18. CMYK Color Selector

CMYK Color Selector

Volič barev CMYK umožňuje vybírat barvy podle barevného modelu (FIXLINK) CMYK.

Vodová barva

Obrázek 15.19. Vodová barva

Vodová barva

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

Obrázek 15.20. Wheel Color Selector

Wheel Color Selector

Volič Trojúhelník se skládá z barevného kruhu, který umožňuje kliknutím a tažením vybrat žádaný barevný odstín, a trojúhelníku, ve kterém lze podobným způsobem intuitivně vybrat sytost a hodnotu (jas) barvy.

Paleta

Obrázek 15.21. Palette Color Selector

Palette Color Selector

This color selector brings up a list of the colors of 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.

Stupnice

Obrázek 15.22. Scales Color Selector

Scales Color Selector

FIXME

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.

Kapátko

The 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.

HTML Notation

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:

Obrázek 15.23. CSS keywords example

CSS keywords example

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.