Las herramientas de selección aveces muestran sus límites cuando deben ser utizadas para crear selecciones complejas. En esos casos, el empleo de la máscara rápida puede hacer las cosas mucho más fáciles. La máscara rápida permite pintar una selección, en vez de trazar su contorno.
Normally when you create a selection in GIMP, you see it represented by the "marching ants" that trace along its outline. But really there may be a lot more to a selection than the marching ants show you: in GIMP a selection is actually a full-fledged grayscale channel, covering the image, with pixel values ranging from 0 (unselected) to 255 (fully selected). The marching ants are drawn along a contour of half-selected pixels. Thus, what the marching ants show you as either inside or outside the boundary is really just a slice through a continuum.
The QuickMask is GIMP's way of showing you the full structure of the selection. Activating it also gives you the ability to interact with the selection in new, and substantially more powerful, ways. To activate the QuickMask, click on the small red-outlined button at the lower left of the image window. The button is a toggle, so clicking it again will return you to normal marching-ant mode. You can also activate the QuickMask by selecting in the image window menu Shift+Q shortcut.
→ , or by using theAl activar la máscara rápida se muestra a la selección como si fuera una capa traslúcida que cubre la imagen, cuya transparencia en cada píxel indica el grado en que el mismo está seleccionado. Por omisión el color de la máscara es rojo, pero puede cambiarlo si otro color de máscara resulta más conveniente. Mientras menos seleccionado esté un pixel, se ve más teñido por la máscara. Los pixeles completamente seleccionados se muestran limpios.
When you are in QuickMask mode, many image manipulations act on the selection channel rather than the image itself. This includes, in particular, paint tools. Painting with white causes the painted pixels to be selected; painting with black causes them to be unselected. You can use any of the paint tools, as well as the bucket fill and gradient fill tools, in this way. Advanced users of GIMP learn that “painting the selection” is the easiest and most effective way to delicately manipulate it.
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To save the selection done by the Quickmask to a new channel; Make sure that there is a selection and that Quickmask is not active in the image window. Select in the image menu SelectionMask copy” (if you repeat this command you will create a “..copy#1”, “...copy#2” and so on...). → . This will create a new channel in the channel dialog called “ |
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Cuando la máscara rápida se encuentra activa, copiar y pegar actúan sobre la selección en vez de hacerlo sobre la imagen. A veces este uso puede ser el más conveniente para transferir una selección de una imagen a otra. |
You can learn more on Selection masks in the section dedicated to the channel dialog.