4.10. Separar un objecte del seu fons

Figura 3.39. Objecte amb fons

Objecte amb fons

Sometimes you need to separate the subject of an image from its background. You may want to have the subject on a flat color, or keep the background transparent so you can use it on an existing background, or any other thing you have in mind. To do this, you must first use GIMP's selection tools to draw a selection around your subject. This is not an easy task, and selecting the correct tool is crucial. You have several tools to accomplish this:

4.10.1. Once you have selected your subject

Once you have selected your subject successfully, use SelectInvert. Now, instead of the subject, the background is selected. What you do now depends on what you intended to do with the background:

  • Per a omplir el fons amb un color únic:

    Click the foreground color swatch (the top left of the two overlapping colored rectangles) in the toolbox and select the desired color. Next,use Secció 3.4, “Pot de pintura” to replace the background with your chosen color.

    Figura 3.43. Resultat d'afegir un fons de color simple

    Resultat d'afegir un fons de color simple

  • Per a fer un fons en blanc i negre mentre manteniu l'objecte principal en color:

    Utilitzeu ColorsDessatura. En el diàleg que s'obre, proveu els diferents modes i seleccioneu el més atractiu, llavors feu clic en D'acord.

    Figura 3.44. Resultat de dessaturar el fons

    Resultat de dessaturar el fons