Microsoft PowerPoint has several easy color adjustments so you can quickly and easily set the images in the PowerPoint presentation. Whether you want to create an artistic masterpiece or simply have your document match the printer's settings, you can change your images to black and white in PowerPoint
How to change a picture to black and white in Microsoft PowerPoint
Change your image to black and white Microsoft PowerPoint is easy! The color adjustment only affects the image that is inserted into your document (and it is reversible to that);
Click first to select the image in your document.
Switch to the "Format" tab on the tape.
19659004] Click the "Color" button.
In the drop-down menu that appears, click the "Saturation 0%" option in the "Color Saturation" group.
 Voila! Your image is now black and white.
And do not worry. PowerPoint still has the original image with all its embedded colors, so you can easily return to the original colors (or even change them to something else). To change your now black and white image back to its original state, just click the "Format" tab again and this time click the "Reset Image" button.
And just so, your image is back to the original color.