Change the opacity when you touch more an object

Hello

I encounter a small problem, indeed I would like that when my player touches an object its opacity changes, but when it no longer touches the object it recovers normal, I found how to do that when it touches the opacity changes, but when it does not touch it anymore , I don't know how to do

Thank you

Touch is touching object Sprite -> Sprite set opacity to 100

Else -> Sprite set opacity to 50

Hello

No since my character advances with the arrows of the keyboard, basically if the character collides with the object its opacity changes, that's good, but if it is no longer colliding with the object its opacity is recovering normal and that's what I can't, sorry for My English but I'm French:)

Ok, then try this:

Character is overlapping Sprite -> Sprite set opacity to 100

Else -> Sprite set opacity to 50

Thank's you very much, it's working !!