Use one as the background of PPT. Why is the color lighter?

It can be like this:

1. cannot use background-fill effect-picture as background, so the picture cannot be modified.

You should choose to insert a picture, then change the contrast and brightness of the picture to make it brighter, and then stretch it to full screen.

3, you can also use acdsee or photoshop to change the picture before making the background!

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