On the Insert tab, in the Illustrations group, click to Picture button to insert a picture.
Locate the folder that contains the picture you want to insert, click the picture file, and then click Open.
You can adjust the relative lightness of a picture (brightness) or the difference between the darkest and lightest areas (contrast) by using the options below.
Select a picture, Under Format tab, on the Picture tab, click these picture modification tools.
Recolor To apply a stylized effect, such as grayscale or sepia tone, click this button, and then click the option that you want.
Brightness Move the Brightness slider, or enter a number in the box next to the slider.
Contrast Move the Contrast slider, or enter a number in the box next to the slider.
Reset Picture Restores the picture to the default settings for Brightness and Contrast.