How to remove the background from a picture on mac

I believe this is an easiest way to remove the background from a picture on Macbook.

1. Open the picture file with preview.

2. Click Markup Toolbar  and select instant Alpha 

   3. You can drag on the background you want to remove and delete it.

 4. Save the file and put the file on PowerPoint or other program to check it.

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The following video will show how to remove the background from a real picture on mac with same manner explained above.

Thanks.