Selection: A part of an image selected for manipulation of any type—duplication
in a layer, color correction, deletion, rotation, and so on. The selection consists of
the selected pixels. The selection tools are located in the tool palette, by default positioned on the left side of your screen.
The Rectangular Marquee tool draws square or rectangular selection
The Elliptical Marquee tool draws round or elliptical selection borders.
The Lasso tool draws freehand selection borders. This tool is great for
making very precise selections.
The Polygonal Lasso tool draws straight-edged segments of a selection
border. You can create as many segments as you need to draw a selection border.
The Magnetic Lasso tool draws a selection border that automatically
snaps to edges you drag over in the photo. This makes it easy to draw precise selection borders.
The Magic Wand tool selects pixels of similar color with one click. You
specify the color range, or tolerance, for the tool’s selection. Use the Magic Wand tool when you have an area of similar colors, like a blue sky.
The Selection Brush tool makes selections two ways. You can paint over the area you want to select in Selection mode, or you can paint over areas you don’t want to select using a semi-opaque overlay in Mask mode. You can first make a rough selection with a marquee tool, and then fine-tune your selection with the Selection Brush tool, adding to or subtracting from the selection by switching between Selection mode and Mask mode.