I don't make mine transparent
but i use Corel PhotoShop
I had to start doing it on mine, because Some "breeder" used a picture of my 2 blue Quakers, trying to pass them off to be their own birds - They said their friend has them, he sent the picture to them. He is the breeder they get the babies from him and hand feed them and sell them, YET where this "friend" lives Quakers are against the law to own
he took the picture from the internet, the picture still had the website address he got it from - which was a picture I put in Parrot Chronicles Picture contest!
so i had to start "watermarking" all my pics and it is annoying and a lot of times I forget
but I know my birds, I know my pictures and if I find them again being used w/out my permission This time I'll do more than just call and rip em' a new one