macOS app idea
Here is a free idea for you.
A Safari extension/app that allows us to select arbitrary images and other elements of the current web page and temporarily eliminate them as a way to clean-up a page before printing/saving etc.
There used to be a Safari extension that did this but it is long since gone.
There seem to be a couple of add-ons out there for Chrome and Firefox, but nothing for Safari, AFAIK.
@Timmy What about AdBlock for Safari?
The AdBlock for Safari App has got two Safari App Extensions: one for basic ad blocking functionality, and a second one (comes together with the app) that sets an icon in Safari to manage ad blocking details for every single page. With this icon (at least in older versions – I'm not sure whether or not it's still there.) you could block elements of the page like pictures, frames etc. from beeing displayed or printed. That seems to be exactly what you are looking for.