The Transform options are applicable to both Selections (see Transform Selection) and Images (see Transform Image).
They are available either by right clicking over a selection box or by selecting Transform in the Edit menu i.e. after you have selected either the Transform Selection or the Transform Image tool in the Tools box. Note that each of the options transforms either the selection itself or the image within the selection, depending on whether you have chosen Transform Selection or Transform Image respectively.
The options include:
Scale |
Scale the transformation box either horizontally or vertically by dragging the handles. The selection will be scaled to match the new box dimensions. |
Rotate |
Rotate the transformation box by dragging the double-headed arrow outside the box. The selection will rotate with the box. Note that the star-like symbol acts as the center of rotation and can be repositioned. |
Skew |
Skew the transformation box by dragging a handle in the direction of the line on which it is situated. You can drag the handle in only one direction at a time. The selection will adjust to fit the skewed box. Note that dragging a center-of-line handle moves the whole of the line. |
Distort |
Distort the transformation box by dragging any handle in any direction. The selection will adjust to fit the distorted box. Note that dragging a center-of-line handle moves the whole of the line. |
Perspective |
The dragged handle will move in the direction of the line of the transformation box. If the handle is at a corner, the opposite corner will move the same distance in the opposite direction. Note that dragging a center-of-line handle moves the whole line. |
Numeric |
In the "Numeric Transform" dialog set the Position values in the X (horizontal) and Y (vertical) boxes. Leave the Relative box checked if you want the transformation box to move relative to the current position, rather than move to a position starting from the top left-hand corner of the window i.e. X = 0 & Y=0. Set the Scale values in the Width and Height boxes. These will scale the width and height of the transformation box. If you want the scaling to be in proportion leave the Constrain Proportions box checked. Whatever you set for the width will also be automatically set for the height, and vice versa. Uncheck the box to set these separately. Set the Skew values, in degrees, in the Horizontal and Vertical boxes. You can set the angle of skew anywhere between -60 and 60 degrees. Set the Rotate value, in degrees, in the Angle box. The possible values run through -179 (clockwise from the x-axis) to 180 (anti-clockwise from the x-axis) degrees. Note that there is also an Angle Indicator: use your mouse to turn the little circle on the circumference of the big circle to set a new angle. The value in the Angle box will be automatically adjusted. |
Rotate |
Rotate the selection by 180 degrees, 90 degrees clockwise or 90 degrees counter-clockwise. |
Flip |
Flip the selection either horizontally or vertically. |