Final answer:
To increase the contrast of a picture in a word processing program, the Format menu or feature is generally used, not the Review tab which is for textual changes.
Step-by-step explanation:
Michael has increased the contrast of the given picture by likely using the format feature or menu option in a word processing program. The Format menu typically includes options for adjusting visual elements of images such as contrast, brightness, and color. It's important to note that the abilities to accept or reject changes in a Word document are located under the Review tab, which mainly pertains to textual changes and not image adjustments.