I recently got a proof print of my book and it seems the text and graphics are too big on each page.
Now I would like to shrink everything down by maybe 30%. Is there a resize function like that?
To be clear: I do NOT want to change the page size, page count or layout. So merely going down in
font size and rescaling the images won't do the trick.
What I'm hoping is that there is some kind of function like the "Transform" function in Photoshop
where you can just resize the whole Book with a couple of clicks to get a wider white border.
Does this exist? Thanks in advance!
Not really. But you can place pages from this file into a new one. The script at InDesignSecrets » Blog Archive » Zanelli Releases MultiPageImporter for Importing both PDF and INDD Files allows you to place either PDF or the original .indd pages and scale them at the same time. In this case I would use PDF as I've seen some cases where reducing the size with .indd causes the type to go smaller than the built-in kerning tables resulting in text reflow and you want a fairly large size reduction.
InDesign does have a scale function, accessed via the Liquid Layout tools. It's kind of clunky and unreliable, but you can give it a shot.
A much simpler and more reliable alternative is our QuickResize add-on: http://www.id-extras.com/products/quickresize
Both options will also change the page size, I believe, but after the document has been resized, it's easy enough to change the page size back to what you want: File>Document Setup.