Add support for images with data expressed in non-8bit values.

[mbasaglia]

Adds support for 12 bit images and allows loading images which define quantization tables after the frame.

[yurydelendik]

Thanks. I will be looking into moving this code into PDF.js repo. Could you add a link (?) to the test images?

[mbasaglia]

Sure, here is a 12 bit image (most likely the browser won't be able to display it) http://mattbas.org/misc/12bitjpg/12bit.jpg

And this is the output: http://mattbas.org/misc/12bitjpg/converted.jpg

(It's some kind of medical image so it looks weird)

[rii-mango]

I'd like to add my support for this feature.

@mbasaglia if you think you can fix the merge conflict, I have several 12-bit images I can test with.

[mbasaglia]

The code for jpg.js has changed completely so it isn't possible to fix conflicts.

[ivmartel]

I too wish to add my support. I don't get the status of the jpg.js, @mbasaglia's file is very different to the one of this repository but closer to the one on the pdf.js repo, why?