Scale Raster

Used to change the proportionate dimensions of an image. To scale an image, use an Active Scale or 3 Points Scale method. The Scale Raster tool adjusts the origin, pixel size, and dimensions of the image. The number of lines and pixels do not change.

Tool Setting	Effect
Method	Sets the method. Active Scale — Scale by the active scale factors (X Scale and Y Scale). If a scale factor is 0-1 (for example, 0.25), size in that direction is decreased; if a scale factor is greater than 1, size in that direction is increased. 3 Points Scale — Scale graphically, through the entry of three data points. The scale factors are computed by dividing the distance between the first and third points by the distance between the first and second points.
X Scale	Scale factor along view x-axis (horizontal), when Method is Active Scale.
Y Scale	Scale factor along view y-axis (vertical), when Method is Active Scale.
Proportional	If on, the raster (X-Y) proportions are maintained, when Method is 3 Points Scale.

To scale an image using Active Scale

Select the Scale Raster tool.

Choose Active Scale from the Method option menu.

Specify the scale by entering a factor in the Scale input box.

Enter a data point at the same location, whatever the scale.
All views update to reflect your scale adjustments.

To scale an image using 3 Points Scale

Select the Scale Raster tool.

Choose 3 Points Scale from the Method option menu.

Enter a data point at the same location, whatever the scale.

Enter a second data point on the image.
A cursor is placed where the data point was entered and a dynamic rectangle outlining the image displays.

Move the cursor so that the image outline increases or decreases to reflect the scale factor. Enter a data point to confirm/accept the new scale. This data point can be entered in any open view. When you move the cursor, observe that the image outline decreases until it reaches a minimum size and then increases again.