With the ability for older consoles to output RGB at only 240p, and using an upscaler like the framemeister you can get amazing picture quality upscaled to 1080p. The bad thing is the framemeister is only available in Japan and is over $300.
There are cheaper SCART to HDMI adapters you can buy but they sometimes add latency or will take the native 4:3 and when you tell it to output 1080p it will scale it and stretch it out.
I have one of the cheaper SCART to HDMI adapters, and as you can see by the screenshot this is how my "Elgato HD60" sees the HDMI signal coming from the converted connected to my SNES.
Here is a good YouTube video to get you informed about it:
https://www.youtube.com/watch?v=43dzrCAfU3A
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