Select
the photo, layer, selection, or shape you want to scale.
Choose Image > Resize > Scale.
Note: If you select a photo that is a Background layer (such
as a photo imported from a camera or scanner), you are given the
option of turning it into a regular layer so that you can transform
it.
Do any of the following to specify the scale amount:
To maintain the relative proportions (avoiding image
distortion) as you scale, select Constrain Proportions, and then
drag a corner handle. Alternatively, press Shift as you drag a corner handle.
To scale only the height or the width, drag a side handle.
Enter a percentage for the Width, Height, or both
in the options bar.
Do one of the following:
To apply the transformation, double-click inside
the bounding box, click the Commit button or
press Enter.
To cancel the transformation, and click the Cancel button or
press Esc.
Scaling proportionally by dragging the corner with the scaling icon