[accessibleimage] Questions about Swell paper and tactile graphics

Hi!

I have been reading the emails about using a printer with Swell paper to
create Tactile images. 
Please forgive my questions if they are ignorant. I haven't heard of this
before and it sounds very interesting. 

Am I understanding correctly? You have an image, say a picture of a cat, you
send the picture to an ink-ject printer loaded with this special paper,
Swell paper, and it prints a raised line drawing?

If this is not correct could you please explain it to me?
Thanks

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