First, open the quick PDF editor, click the background under the document, and open the design toolbar. Then, select "Customize" in the design toolbar and click "Customize" to open the customization submenu. In the submenu tool, select Set Background Format and click Set Background Format to open the function of setting background format on the right side of the slide interface.

Click on the slide, be sure to click on the top of the background picture, and don't click on other blanks, otherwise you can't remove the padding of the background picture in the "Set Background Format" on the right. Click and select "Solid Color Fill", and you will see that the background image will be gone soon.

common sense

Usually, the specifications of photos are expressed in inches, which is different from the diagonal length of products such as monitors. "A few inches" in the photo refers to the length of inches on the long side of the photo.

For example, a 6-inch photo is a 6×4-inch photo. There is also a commonly used method to indicate the size of a photo in the world, which is to take the integer value of the short side of the photo and add the letter R to indicate it. For example, a 6-inch photo, the specification is 6×4 inches, which is 4R.