(Anonymous) 2023-07-19 10:16 pm (UTC)(link)
Hopefully someone will chime in with an official site answer, but if not, and depending on how faithful you need it to be, you could always use Waifu2x:

https://waifu2x.udp.jp/

to enlarge the image 4x (to 1400) and then resize it to 750 in another program (waifu doesn't have the ability to set more specific target ratios, so far as I know, but doing it like this would probably get you a clearer image than using another program to do the enlarging in the first place).

(Anonymous) 2023-07-19 10:23 pm (UTC)(link)
sa

As an example, here's an image of good ol' Firage I resized that way:

1400 - https://i.imgur.com/PsuWK6G.png
750 - https://i.imgur.com/3jhIfI8.png

(Anonymous) 2023-07-19 10:25 pm (UTC)(link)
and for comparison, directly upsizing to 750: https://i.imgur.com/kyFCOy9.png

(Anonymous) 2023-07-20 04:10 am (UTC)(link)
omfg i would genuinely pay for this service on the forums

(Anonymous) 2023-07-20 04:30 am (UTC)(link)
ayrt

I can do it for you if you post here again, if you want, but the site is pretty easy to use.

For the basic 2x version, you can upload an image or just go by URL (scry images work); for 4x, you have to save it to your computer first and upload it to the tool.

Happy to answer any questions or confusion, I love that site :)

(Anonymous) 2023-07-20 09:15 pm (UTC)(link)
If you set up a shop on the site forums for this service, you will make bank

(Anonymous) 2023-07-21 12:28 am (UTC)(link)
Maybe, but 1) I'd feel iffy for taking pay just for using somebody's readily-available tool, 2) I don't have the consistent time available for FR to know that responding to unpredictable forum posts would be anything but stressful, and 3) I don't want to un-anon, or I'd just post a guide onsite.