area 1  R   G   B    area 2  R   G   B    描画

canvas size  w   h   patten thickness  % rand  spacing regd

horizontal   vertical   checkerboard   random dots   arcs   regular dots

sinusoidal gratings

horizontal  lower  R   G   B    upper  R   G   B   period  v shift

vertical  lower  R   G   B    upper  R   G   B   period   h shift

canvas size  w   h     描画

horizontal   vertical   plaid    linear (gamma correction)

HCV View from the top

  radius     draw

hexagonal type    without white

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