“Halo a little too pronounced? Click here to see an image adjusted for your device” > Second page/popup/whatever > “I’m viewing on: iPhone, desktop, HDR, etc” >

“Halo a little too pronounced? Click here to see an image adjusted for your device” > Second page/popup/whatever > “I’m viewing on: iPhone, desktop, HDR, etc” > show appropriate image. Points being: Don’t complicate the view for most visitors, but let the pros know that they are right to ask.