Character Colour Values

The character model's internal colour variables are held in the CharaMake*ColorParam BCSV table,

* being Eye, Hair, or Skin.

The CSV table headers are CRC-32 encrypted.

The CRCPedia contains decrypted table headers for all BCSV tables.

The colour values are defined as 0-1.0 ranges for the Red, Blue and Green channels.

Colour Modification

 * Adjust the gamma of the colour you intend to use to 0.4, in order to offset the in-game gamma correction of 2.2.
 * Divide the Red, Blue and Green values by 255 to adjust the range to 0-1.0
 * Lookup the appropriate BCSV table in the CRCPedia
 * Find the set of Red, Blue and Green values you intend to replace
 * Replace them with your intended set of values
 * Save the BCSV table

Colour Atlas
You can find each colour listed in the ACNH Character Colour Atlas, with gamma-adjusted swatches for easier reference.