If you are doing screen captures, then ideally you have a monitor that can display a full page at a resolution greater than what you require. Then you don't have to stitch things together. In my case I have Apple Studio Display (5120x2880 - 5K), a 4K display should work just as well.
How do you know original image is 1988x3056? KFX comics files downloaded to device are usually 1920x1248. They can get upscaled on a display but it's not really generating higher resolution. There's no point in having them upscaled, it just makes the files larger.
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