That is the facts of monitors... One kind person on 'Rosity pointed out to me how "the edges" of a submitted image were difficult to see. Why? That person had set a different background color on the site. I had failed to think about that part! Some might be viewing on a white field and another on a different color. I keep mine on white here. The two monitors on this desk include one quite old one, not well calibrated but close. The images do look slightly different. As excellent at newer monitors may be, viewing is a variable we cannot control on the other end. My concern for calibration is for images I do to have an accurate transition to print.