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In case you're asking about all types of emulator, ElectrEm will copy the current display to the clipboard following either your OS's standard keyboard shortcut or you asking it to do so from the menubar. You can then paste that into whatever art program you want.
The images are always 640x512, but in Mode 2 that means that every 4x2 pixel block will be a uniform colour so getting any reliablepaint package to resize of resample to 160x256 should produce a pixel-identical version of the original screen, irrespective of whether the paint program point samples, box samples, Gaussians or whatever.
EDIT: ye olde ElectrEm (prior to about 2002) had an option to save a PCX (I think, might have been BMP) image of the current screen that would inspect it to find out the minimum resolution that could be used without losing data (which is not always dictated by the current screen mode because some games use multiple screen modes on the same display) - though I can't remember whether it would go to the extreme of saving a 4 pixel by 3 pixel image for a blank screen.
This stuff's all a lot easier on the Electron, as there is no CRTC and the region of the display that may have pixels on as well as the potential placement of those pixels is very rigidly defined.
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