I dont color my backgrounds pink I found the same problem if you want it transparent it needs to be and saved as png thats what works for me also check off this image has transparent parts and the one below it alpha channel see if that helps you.

Thanks to both of you. That worked out. I did fin the This image has transparancy box. once. But not since.

And  the firs time I got the transparancy to work , It was ,,,,Interresting.

there's probably more ways than one to do this however, I have just started using masks to create semi-transparency or varying degrees of transparency. once you create a mask you can save it as an alpha channel. black being fully transparent and white having no transparency. the shades of gray in between provide your degrees of transparency.

hope I said this correct, I'm still learning as well.