Hold down the shift key to keep the height and width the same.
Deselect - Gets rid of any selected areas - Select>Deselect= control+D
Lasso/Polygonal Lasso/Magnetic Lasso tools
Lasso - Click and hold to outline a selection, joins the two ends of the line when you let go.
Polygonal Lasso - Click point-to-point to outline a selection with straight edges - Double click to join the two ends.
Magnetic Lasso - Looks for similar colours, or a line to automatically create a line that you move your mouse across. You can force a point in, by left clicking anywhere you wish.
Invert selection - Switches the selected area(s) to deselected and deselected areas. Select>Inverse = Shift+Control+i
Anti-alias/Feather - The anti-alias checkbox lets you smooth out the edges of a selection to avoid pixelated edge.
Feather - The amount of blurring you can add to the edge of a selection (measured in pixels)minsters of a head edge. This can be used to make selections 'fade out'
Magic Wand - Click to select an area that is all the same colour. You can adjust the tolerance to make it either select just one exact colour (0) or pick a wider range of colours
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