PowerPoint doesn’t have an automatic tool that makes entire images transparent. To apply this effect, insert a shape into the slide to hold the picture and apply transparency. However, you can create a color in a transparent image without using the shape as a placeholder.
Make a transparent image
Open the Insert tab and choose Shapes. Select a shape that matches the shape of the image, such as a rectangle, and select it.
Hold your mouse over the slide – the pointer shows up as a cross – and click and drag to insert the shape. Don’t worry about the size and position of the shape right now; You can edit it later.
Right-click on the shape and choose Format Shape.
Select Fill and then Picture or texture fill.
To add an image from your computer, select File to find the file and insert it. Use the Clipboard to paste an image you copied to your system memory tray, or choose Online to search for the image in Bing Image Search or your OneDrive account.
Resize images by selecting the squares on corners or lines and dragging them in or out.
Move the Transparency bar to increase the transparency of the image or use the Transparency box’s arrows. Image preview effect when you increase percentage; stops when you get the desired level of transparency. Select X on the Format Shape box to close the menu and apply the change.
Creates a transparent color
You don’t need to add an image to keep a photo if you only want to make a specific part of the image, defined by their color, transparent; insert pictures in a slide.
Select the image and open the Picture Tools tab. Select the Color button in the Adjust area and then Set Transparent Color. The mouse pointer changes the pen shape. Click the color you want to make transparent.