removing background colors from an image

[Viso help]

How do I remove the background color from an image.

[Paul Herber]

Post by Viso help
How do I remove the background color from an image.

From an image? If you really mean an image then it's best to use an image editor.
Or do you mean from a Visio page? Depends a bit on where the background is coming from.
Tell us more about what you have and what you want to do with it.