The simple way to deal with a fancy background image is to cover the fancy background image and highlight the text. For covers with double headings, the main heading is enlarged and the text background is filled in to make it stand out.

This kind of bottom picture is the best layout, text and picture each half, you can make the whole PPT design become very rich, and it is very easy to maintain the clarity of the text displayed in the picture. This image shows the food in the best possible light, while, at the same time, being concise and rich around the title. These are templates from Office Resource Network, which has a lot of templates on food presentation.