问题
I have a PDF page of n pages as input. On every m-th page, there is a area which I want to crop and save as an image.
Concrete example:
- 500 page PDF
- on every 10th page, I want to crop the area from point (10,10) to (110,110) and save it as a single image
I think the best solution would be a tool which could do this with just one command line call, so that there is no need for programming with iterations / passing outputs as inputs to other calls. Unfortunately, I haven't found such a tool. Any idea?
Needs to run on Linux.
来源：https://stackoverflow.com/questions/24699773/what-is-the-most-efficient-technique-to-convert-pdfs-to-images-on-linux-command