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===Overscan===
[[File:Retroarch_2013-08-16_06-32-24-62.png|thumb|250px|Example of faulty visuals that are exposed due to crop overscan not working. Note the blank blue area to the left and the green garbage on the right.]]Several NES games need the overscan to be cropped to look proper. There is however, seeminly seemingly no standad standard level of overcropping. Many games seem to require different levels of overcropping. SMB3 requires a lot of cropping, however the same level of cropping will obscure of the letters in the status bar in Castlevania games. It did not seem that there was standardization until the next generation of consoles.
===Color Palette===
Unlike consoles like the SNES, which natively generate the image in pure RGB, the NES/Famicom normally generates and outputs an encoded NTSC video signal, which must then be decoded by the TV's built-in NTSC decoder. This means the resulting color palette often varies depending on the display's decoder. This is why NES games appear to have different colors on different TV sets.
