I have a multi-page PDF.
I want to make a PNG which is just all of these pages appended.
Preview.app's Export... > PNG option saves it as a ... multi-page PNG? I didn't know those were possible, but Preview opens up this PNG like it has many pages and Safari doesn't seem to be able to display both these "pages" properly.
I just want to convert a PDF into a very tall PNG, which is all of the pages on top of each other.