For that you might use a macro like:
Code:
Sub Demo()
Application.ScreenUpdating = False
Dim i As Long
With ActiveDocument
For i = 1 To .Shapes.Count
With .Shapes(i).PictureFormat
.Brightness = .Brightness + 0.4
.Contrast = .Contrast + 0.4
End With
Next
For i = 1 To .InlineShapes.Count
With .InlineShapes(i).PictureFormat
.Brightness = .Brightness + 0.4
.Contrast = .Contrast + 0.4
End With
Next
End With
Application.ScreenUpdating = True
End Sub
For PC macro installation & usage instructions, see:
http://www.gmayor.com/installing_macro.htm
For Mac macro installation & usage instructions, see:
https://wordmvp.com/Mac/InstallMacro.html