The correct term for png files is "alpha transparency".
A kind of definition: Alpha channel
How to do:
- Photoshop -> Create a Transparent Image with Adobe Photoshop
- Gimp -> Saving Images with Transparency
It's similar for other graphic applications.
A kind of definition: Alpha channel
How to do:
- Photoshop -> Create a Transparent Image with Adobe Photoshop
- Gimp -> Saving Images with Transparency
It's similar for other graphic applications.