The resilient classes have a resolution class option, undocumented (well, actually just mentioned in passing -- i.e. in a footnote -- in the documentation of the embedders package, which is the only one to use it at this point...)
The printoptions.sile collection has a resolution setting...
The embedders.sile collection uses one or the other depending on what it finds...
The standard image package obviously doesn't know about it and doesn't warn (at least) for under-resolved images (over-resolved images are what printoptions aims at addressing, hence the "at least")
There's probably ways to better document and address the need!
A bit messy and poorly documented:
resolutionclass option, undocumented (well, actually just mentioned in passing -- i.e. in a footnote -- in the documentation of the embedders package, which is the only one to use it at this point...)There's probably ways to better document and address the need!