Super NES Programming/pixel editing tutorial
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GIMP's good, but is not designed for SNES files. YY-CHR is better for pixel art and widely used in the SMW hacking community. Note that you may have to manually set the file mode.
- The GIMP, a free raster graphics program
- JTL Ulitmate Paint , a free to use/commercial "NO TRIAL" graphics program "just save to .pcx format / use SNES starterkit program like Pcx2Snes.exe through CMD to convert to.CLR and .PIC format -> if your programming also set it too 256 colors and use 64x64 , 16x16 or 8x8 pixel dimensions"