How to improve the quality of screen shot

hello,everyone. I want the screenshot of the 3D window to be sharper, I saw the previous issue that scale factor can be adjusted,is there a Python code for that now ? Now, i used off screen render to set a high resolution widget then use screen shot but its too slow,Is there any better way for that?

The last time I looked the scale factor option was not working for capturing tiled rendering for the volume renderer. Offscreen rendering is probably the best bet for now.

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