The more complex the background is, the more difficult it will be to remove.In most cases you will be making multiple selections and deletions in order to remove the entire background – surroundings are rarely that simple.Clicking the Delete key will remove the selected pixels and leave an area of transparency. When you release the mouse, the mask changes to show the “marching ants” around the area that will be removed. The selection will display in real-time as a transparent, red mask. Dragging away from the click point in any direction increases the size of the selection based on the similarity of adjacent pixels. Start by clicking and holding inside of any group of pixels you wish to remove. There is no indication of which tool you are using once you’ve made your selection in the toolbar. NOTE: All of the tools in Preview use the same cross-shaped cursor (+). Providing you are viewing an image and not a pdf, you will be able to use any of the tools in this menu (otherwise they will be grayed out, indicating that they are not available for use with pdf files). You can either: a) click and hold that button for a pop-up menu of all the selection tools, or, b) stretch the width of the Preview window causing the selection tools to line up side-by-side in the lower toolbar. The Edit Toolbar will display beneath the default toolbar revealing several useful tools, the Selection Tools button among them (see above). Access is to the tool is gained by first clicking on the Show Edit Toolbar button shown above. With OS X 10.8 (Mountain Lion), Instant Alpha now is hidden away in its own toolbar and nested within with a group of selection tools.
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