nes-chr-encode

Converts a PNG file to an NES CHR data file.

Note: requires the PyPNG module.

Hint: my nes-chr-decode does the reverse thing (converts an NES CHR data file to a PNG file).

Command line arguments

Syntax: [options] input_file output_file

options

• --color0=color
  • What color in the PNG image should be converted to color 0 in the CHR data.
  • color: see below.
  • The default is 000000 (black).
• --color1=color
  • What color in the PNG image should be converted to color 1 in the CHR data.
  • color: see below.
  • The default is 555555 (dark gray).
• --color2=color
  • What color in the PNG image should be converted to color 2 in the CHR data.
  • color: see below.
  • The default is aaaaaa (light gray).
• --color3=color
  • What color in the PNG image should be converted to color 3 in the CHR data.
  • color: see below.
  • The default is ffffff (white).

Notes:

• color is an HTML-style color code (six hexadecimal digits, RRGGBB, case insensitive).
• All the colors must be distinct.
• The input file may only contain the colors.
• However, the input file need not contain all the colors.

input_file

• The PNG image file to read.
• The width must be 16 NES characters, i.e. 128 pixels.
• The height must be a multiple of 1 NES character, i.e. 8 pixels.
• The image must have 4 unique colors or less. (They all have to be specified by the --colorn options above.)

output_file

• The NES CHR data file to write.
• The file size will be a multiple of 16 NES characters, i.e. 256 bytes.
• The file must not already exist (it will not be overwritten).

Example

Convert smb-chr.png to smb.chr:

python nes_chr_encode.py smb-chr.png smb.chr