How to make the background of the picture blank and just have the picture show

So I am trying to create my own health bar and its own system by having pictures of the health appear and disappear depending on the current health and I was wondering if anyone knows how to make the back boarder part of the picture that’s white disappear so that only the image shows and not its background. I tried to decrease the alpha but it just makes it invisable.

You need use alpha channel to mask out the area you want hidden.
There are tutorials for using Photoshop/Gimp to create them (google em’).

See also:
PNG with Alpha: How do you get them to work?
Get rid of white background?

This tutorial shows a basic way how you can do it: How To Create Alphamaps in Photoshop & Unity (Transparent Textures) - YouTube :slight_smile: