In my unstructured Frame Maker Document I use AFrames to scale the images (mostly screen shots) to the paper size. I use always 150 dpi and the quality is very good in the PDF output (3,200 pages) and in the chm file using WebWorks.
I am now evaluating FM2017 Responsive HTML feature to replace local chm to a hosted Web Help.
The responsive HTML may ignore the AFrame size and the scaling and use the 100% best image quality. This makes the images greater but destroys the layout. (Not an issue in my case, because all screenshots uses full left to right in the page)
The scale and size uses the original AFrame size. This will keep the orginal layout.
Offering a zoom feature, the user can click on the scaled image to see a popup with the 100% orginal image.
The zoom feature would be nice. But even, if I include the java script part, the images rendered in the ./assets folder are already scaled?