Select Palette from the Edit menu if the palette is not displayed.
Specify the scale percentage.
The default value is 100%; change the value in one of the following ways:
Double-click in the Scale Percentage field and type the number
Click the arrow buttons
Drag the slider
Click the Scale tool.
Image Viewer scales the image according to the value in the Scale Percentage field.
To restore the image to its last-saved size, click Revert.