Use this tool to select a rectangular area in the active image frame. When you click the Rectangle Selection Tool button and move the cursor over an image frame, the cursor will take shape of a cross. Position the center of the cross where you want a corner of the selection to be, press the left mouse button to anchor the corner and drag the cursor in any direction to draw the desired selection. As you draw the selection, ImageWarp displays the coordinates of the starting point and the moving cursor, as well as the sizes of the selected retagle (see Status Bar for more details). If you want to constrain the selection to a square, hold down the CTRL key while dragging the cursor. Pressing the ESC key or the right mouse button while drawing a rectangle selection will cancel the action. To resize a rectangle selection so that only one of its dimensions is affected, position the cursor over any side of the marquee and drag the side of the marquee. To resize a rectangle selection so that both dimensions are affected, position the cursor over any corner of the marquee and drag the corner of the marquee. To reposition a rectangle selection, position the cursor inside the selection and drag it to a new location.
To add an additional rectangular area to a current selection, hold the SHIFT-key. The cursor will take a shape of a cross with a small "+" sign next to it. Use the described procedure to define a new rectangular area. When you release the mouse button, a new selection will be added to the current one and the selection marquee will be rearranged to outline the combined selection area.
To subtract a rectangular area from a current selection, hold the ALT-key. The cursor will take a shape of a cross with a small "-" sign next to it. Use the described procedure to define a negative rectangular area. When you release the mouse button, a new selection will be subtracted from the current one and the selection marquee will be rearranged the resulting selection area. If you create a negative selection area on an image with no current selection, a full-size rectangular selection will be automatically created and the defined negative region will become "a hole" in it.
Note that these operations neither affect the image, nor change a Standard Selection to a Floating Selection. To remove a current selection, click in any place of the image. See Working with Selections for more details.