I normally take screenshots with msi afterburner, the point is getting screenshots in the internal resolution, not my desktop resolution.
For example, I normally play with the window maximized to my desktop resolution 1920x1080, which when using large screen mode means the top screen resolution is exactly 4x native resolution, and I run the games at 8x resolution to downsample, but I'd like to take the screenshots at that 8x resolution that citra is rendering at.
I can run the desktop at 4k using dsr and that would allow me to take higher resolution screenshots, but then I'd have to change the resolution whenever I have to look at something else.