While I understand your frustration, this is something that is working within the software, and we are not the company supporting your server environment.
We have at present
Checked the image in question on your site
Asked for a copy of the image in question, and checked that to ensure its showing as we would expect
Tested this on an unaltered instance in development, and in the test area on this site
Suggested that you run a compatible version of PHP
We are unable to support your environment. Our current advise is to ensure you are running your site in a compatible environment, and if that is then still not working to contact your hosting company. Your answers to the 2 of those are that you are not willing to downgrade PHP to a version which is compatible with the platform, and that you are the host yourself.