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My computer is a laptop, so no CRT-style brightness control
That's odd; the Macs I've used that have flat-panel displays all have a brightness slider in the control panel.
As for the screenshot, I should have figured someone would ask about the settings. I'll have to look at what I did tomorrow. If I remember correctly, I used the
latest snes_ntsc with snes_ntsc_composite settings, resolution and sharpness at about 0.20, and then interpolated the scanlines and darkened them by 12%. The ZSNES team seemed to be having some problems with their general filter architecture when they originally added the NTSC filter, and didn't seem ready for the latest version when I e-mailed several months ago, so they're probably still using an older one that lacks the resolution control. bsnes does use the latest version, so it'd be a better one to experiment with.
Oh and in case it's confusing anyone, yes, I used the SNES filter for a NES image, because both filters do the same thing internally. The NES filter does the additional step of converting NES palette values into RGB colors, while the SNES filter accepts RGB colors directly. Since the source image was already RGB, it was simpler to use the SNES filter.