I am creating a book in InDesign for the first time. It's a children's book that will feature scanned actual photos that I've touched up in Photoshop and am dropping into Indesign. I've saved these as PDFs.
I have to scale these up significantly (most are done on a standard 8x10 page, the book is going to be 12x18. And I am worried about losing quality as the image gets printed.
Is there a trick to this I am missing? Should they be made into a vector image? When I do this, the Vector image actually appears worse than if I drop a PSD or PDF into indesign.
This book is hugely colorful and I don't want to make a mistake that will wind up costing me a large amount of work if I have to convert them later to .ai or something.