Which is the best image format for Rise and Storyline?

Just noticing a downgrade in image quality over the past few months and stumbled across this thread in an effort to find out why.

I've tried the '_noprocess_' workaround and can confirm it makes a huge difference in quality.

Apart from being almost unworkable with regard to revising our naming conventions in the production workflow to incorporate this workaround there is actually a more fundamental issue that makes it a non-starter.

In testing it across different browsers, the '_noprocess_' file works fine in Safari and Explorer, in Chrome and Firefox, however, the '_noprocess_' directive displays as the filename only, not an actual image. I am not a coding expert - or novice even - but guessing this instruction may interfere with their own. I don't know.

I assume the reason behind the image 'processing' choice would be one of cloud hosting and storage space/cost but if that means I can't deliver the highest quality course content across all potential user outlets then it seems this solution is broken.

Wouldn't it be simpler if this were a setting choice in the user menu? Images processed as 'on' by default for clients who don't know or need hi-quality imagery but for those who do, they have the option without bricking alternative browsers or upending their workflow processes.

Any further solutions would be appreciated.