The Manipulate a Window action allows you to operate on a window, in a specified application, with a wide variety of actions like scale, move, resize, bring to front, etc. (see complete list below).
Note: All units are in nominal resolution pixels (sometimes called points), not raw pixels. So a typical retina screen will have half as many nominal resolution pixels as raw pixels. See the SCREEN function for more info.
This action is in the Interface Control Action Category, and the default configuration is set for the Resize Front Window Operation:
You will need to select (by popup button ( )) a choice for each of the following:
All units (except percent) are in nominal resolution pixels.
You can get the window id from AppleScript, or using the %LastWindowID% token.