number=positive integer - maximum number of colors to return, 20 by default

space=string - the color space of the output color objects, "Lab" by default

This command reduces a large list of colors down to a small representative list of less than 20 colors.

$\mathrm{with}\left(\mathrm{ColorTools}\right)\:$

$\mathrm{full}≔\left[\mathrm{seq}\left(\mathrm{Color}\left(''RGB''\,\left[1-i\,i\,1-i\right]\right)\,i=0..1\,0.05\right)\right]$

$\left[\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\right]$

$\mathrm{numelems}\left(\mathrm{full}\right)$

$21$

$\mathrm{reduced}≔\mathrm{ReducePalette}\left(\mathrm{full}\right)$

$\left[\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\right]$

$\mathrm{numelems}\left(\mathrm{reduced}\right)$

$11$

$\mathrm{imgfile}≔\mathrm{cat}\left(\mathrm{kernelopts}\left(\mathrm{datadir}\right)\,''/images/antennas.jpg''\right)\:$

$\mathrm{ImageTools}:-\mathrm{Embed}\left(\mathrm{ImageTools}:-\mathrm{Read}\left(\mathrm{imgfile}\right)\right)$

$\mathrm{full}≔\mathrm{ColorsFromImage}\left(\mathrm{imgfile}\right)\:$

$\mathrm{numelems}\left(\mathrm{full}\right)$

$226$

$\mathrm{reduced}≔\mathrm{ReducePalette}\left(\mathrm{full}\right)$

$\left[\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\right]$

$\mathrm{reduced}≔\mathrm{ReducePalette}\left(\mathrm{full}\,'\mathrm{number}'=8\,'\mathrm{space}'=''RGB''\right)$

$\left[\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\,\mathbf{module}\left(\right)...\mathbf{end\; module}\right]$

The ColorTools[ReducePalette] command was introduced in Maple 18.

For more information on Maple 18 changes, see Updates in Maple 18.

The ColorTools[ReducePalette] command was updated in Maple 2020.

The number and space options were introduced in Maple 2020.

For more information on Maple 2020 changes, see Updates in Maple 2020.