2.8. Selección del frente
| 2. Herramientas de selección |

### 2.8. Selección del frente

Figura 14.34. La herramienta “Selección de primer plano” en la caja de herramientas

This tool lets you extract the foreground from the active layer or from a selection. With GIMP-2.10, selection refinement has been improved. After the selection is made, with its marching ants, you can copy-paste or click-and-drag it to another image used as background,and, inverting the selection, you can can make changes in background.

#### 2.8.1. Activar la herramienta

Puede activar esta herramienta de dos maneras:

- pulsando sobre el icono de herramienta en la caja de herramientas,

- desde Herramientas → Herramientas de selección → Selección del frente en el menú de la imagen.

- Esta herramienta no tiene atajo de teclado, pero puede definir uno usando Editar → Preferencias → Interfaz → Configurar combinaciones de teclas → Herramientas → Selección del frente

#### 2.8.2. Indicaciones para su uso

Let us start with an object distinctly different from background, not needing to be refined.

1. Seleccionar aproximadamente el frente que quiere extraer. Cuando selecciona esta herramienta, el puntero del ratón se convierte en el icono de lazo. Actualmente, funciona como la herramienta de selección difusa. Seleccione lo menos posible del fondo.

   When the mouse pointer comes over line beginning, a small yellow circle appears: release mouse button to close selection. While selecting, click-and-drag draws a fuzzy line, drag only draws a straight line.

   The selection is closed.

   As soon you click to start drawing, a small window pops up:

   There you have:

   - A Preview checkbox that toggles displaying a preview of the foreground extraction status. Esc key also toggles this preview.

   - A little cross to quit: returns to the original image.

   - A Select button: not active for the moment.

2. Press Enter to create the mask:

   The mouse pointer goes now with the Paint-brush icon. The dark blue area (this color can be changed) is for background. The light blue area covers the zone you have selected, on which you will paint to extract foreground. Between foreground area and background is a zone you have selected belonging to background named Unknown pixels area.

3. Dibuje una línea a través del frente: usando la brocha, su tamaño se puede cambiar en opciones, dibuje una línea continua en el frente seleccionado sobre los colores que quiera preservar de la extracción. El color de la línea no es importante; es mejor usar un color distinto de el del fondo. Tenga cuidado de no pintar píxeles del fondo.

   With this one-color object distinctly different from background, a few strokes are enough:

4. Toggle preview to verify result.

   | Nota
   This Preview mask is a mask: you can draw directly on it and see result immediately.

5. Try Matting Levin engine that may improve result.

6. When you are satisfied with result, click on Select button to get the selection of the foreground with its marching ants.

#### 2.8.3. Opciones

Figura 14.35. Opciones de la herramienta de “Selección de primer plano”

Normalmente, las opciones de herramienta se muestran en una ventana unida por debajo a la caja de herramientas, tan pronto como se activa una herramienta. Si no están, se puede acceder a ellas desde la barra del menú de la imagen a través de Ventanas → Diálogos empotrables → Opciones de herramienta que abre la ventana de las opciones de la herramienta seleccionada.

Mode; Feather edges

  | Nota
  Consulte la sección Herramientas de selección para obtener ayuda sobre las opciones que son comunes a todas estas herramientas. Aquí sólo se explican las opciones específicas de esta herramienta.

Draw mode

  Draw foreground: to draw what will be foreground.

  Draw background: to draw what will be background.

  Draw unknown: to add to your selection pixels that are in background.

Stroke width

  The size of the brush.

Preview mask

  You can adapt the color of the preview to your image.

Engine

  Work with Matting global(default) and improve result with Matting Levin.

Iterations

  Default is 1. Repeating algorithm may improve result.

#### 2.8.4. Refining Foreground Extraction

In most images, foreground is not distinctly different from background. Refining selection allows you now to extract these foregrounds. Procedure steps are the same as above, but, during drawing foreground, you will often toggle Preview, use Zoom (+ key), Draw background to delete unwanted background extraction areas. You can also work directly on Preview mask.

Figura 14.36. Example for Draw background

On the left: drawing foreground ill-advisedly went over unknown pixels area: a part of background will be included in foreground selection!

In middle: Draw background option is checked: draw on inclusion and unwanted pixels.

On the right: unwanted selected pixels in background are no longer in foreground selection.

You will often have to reduce the unknown pixels zone with Draw background.

Figura 14.37. Example for Draw unknown

On the left: the selection left a small part of foreground unselected, in unknown pixels area.

On the right: with Draw unknown option checked, draw on unselected pixels. They are now selected in foreground.

2.7. Tijeras inteligentes |  | 3. Herramientas de pintura

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