1 In the opened PPT document, right-click on the blank space of any PPT slide page and select "Format Background"; Or click the design tab and select "Format Background" in the background style on the right:

In the pop-up "Background Format" window, select "Fill" on the left, and you will see four fill modes: solid color fill, gradient fill, picture or texture fill and pattern fill.

3 Insert a beautiful background picture: select "Picture or Texture Fill", and "Insert from" has two buttons, one is "File", you can select the PPT background picture saved by the computer, and the other is "Cut Drawing":

4 Click the "File" button to open the "Insert Picture" dialog box, select the storage path of the picture, and then press "Insert" to insert the PPT background picture you prepared;

5. After returning to the "Format Background" window. The last step is just to insert a PPT background picture for this slide. If you want to apply the same PPT background picture to all slides, click the "Apply All" button in the lower right corner of the "Format Background" window.

6 In PowerPoint20 12 version, the "Set Background Format" window has three effects of modifying and beautifying the PPT background picture, including picture correction, picture effect and artistic effect. It can adjust the brightness contrast of the picture or change the color saturation, hue, recolor or achieve the effects of line drawing, photocopying and crayon smoothing.