WillSams

Pre-requisite
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- Install GIMP:  https://www.gimp.org/
- Download the Shiru's NES Screen Tooll:  https://shiru.untergrund.net/software.shtml 
- Download this 8-bit color palette: http://zanagb.deviantart.com/art/The-NES-GIMP-Pallete-V2-197049739
- Import the palette into GIMP (Windows->Dockable Dialogs->Palettes, then Right-Click and import)


1 - Open your image in GIMP, preferably a 128x128 one.
2 - Go to Image -> Mode -> Indexed. Select "Use custom palette" and click on the colors icon. Navigate to the NESPAL.gpl file you just imported.