How do you draw a transparent image?

[nomad-software]

How do you draw a transparent image?
For example, I have a coloured background and I want to draw a sprint on top at 50% opacity.

[hajimehoshi]

Try ColorM's Scale.

https://github.com/hajimehoshi/ebiten/blob/2.4/examples/alphablending/main.go

[nomad-software]

For reference, the part that was really confusing me was solved by using this as the background colour:

backgroundColour = color.NRGBA{0, 0, 0, 255}

I guess the background colour is important for the image to alpha-blend properly.