Coloured a JPG, Non-Coloured as PNG

Hello.

I've been seeing for a while that in manga releases coloured pages are in JPG format and the non-coloured pages are generally in PNG format.

I've never really worked with PNG so I don't know much about it. I attempted to use google to find the answer to my topic but to no avail, and anywhere I went to read up on the images didn't provide the information I was looking for.

I'm hoping someone here has experience and can provide an adequate explaination.

Why JPG for colour and PNG for non-colour?

PNG is usually used with vector graphics with hard lines ie. manga pages. While jpeg compresses better with gradients and colour heavy images ie. your front page of a manga book.

Find out more here.

Ah this page is good. Thanks for the link/reply.