using putText() diagonally?

edit

Hello,

Is it possible using the putText() method to draw text on a picture diagonally?

If not, beside using addWeighted() to blend two pictures together (where one of them is a text placed diagonally), is there any other option?

I'm trying to place a text watermark on a picture, my problem is that right now i'm using addWeighted() to blend a text drawn diagonally on a white background. Even with alpha 0.9, the white background changes the original picture.

Any ideas?

Thanks,

Alex