I'll explain better: I receive from my customers a drawing (which they want to screen print it on t-shirts). Often I receive the drawing on paper, I then scan the drawing and use this as the first layer in AD. Then I start drawing on the second layer. I did this already >500 times. for printing on t-shirts it's always in 1 color: black.
Sometimes I receive the drawing by mail as a jpeg. I then use that jpeg as first layer and start drawing on the second layer. So far so good, no problem.
But it happens that I receive a jpeg with a picture that is so complicated that it will take many many hours to draw it.
If I can transfer that jpeg into a workable format, that would help me a lot. And saving time.
I hope that I explained it now more clear.