How can I play a NES emulator in grayscale video mode?

How can I play a NES emulator in grayscale video mode? - Crop black boy browsing tablet in room

I'd like to play some emulated NES games in grayscale. Is there a video mode/effect I can apply that displays the games in grayscale instead of color?






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How can I play a NES emulator in grayscale video mode? - Serious ethnic little girl using tablet during weekend at home with sibling
How can I play a NES emulator in grayscale video mode? - Man in Black Coat Holding Camera
How can I play a NES emulator in grayscale video mode? - Unrecognizable couple playing video game with gamepads at home





NES Emulator Part #4: PPU - Background Rendering




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