libcolor-spectrum-perl 1.16-1 (amd64 binary) in ubuntu noble

 Color::Spectrum is a module to make spectrums of colors for web page table
 tags. It uses a real simple geometric conversion that gets the job done. It
 can shade from dark to light, from saturated to dull, and around the
 spectrum all at the same time. It can go thru the spectrum in either direction.