What I Have
I have a PDF containing a series of photos. Each photo occupies an entire A4-sized page. That is, each page of the PDF contains 1 photo, and there is no border/background/canvas showing around the photo.
What I Want
I want to rescale the photos so that there is a page background showing around the photos. In other words, I want each page to look like a blank white page with a photo at the center, not occupying the whole page.
Idea: resize all the pages of the PDF, then create an empty white-background document with the same number of pages, and then put the resized-photos PDF on top of the empty-document PDF. But... I don't know how to do this.
I do have Adobe Acrobat Pro, but I would prefer a
pdftk solution so I don't have to mess with Windows.