In the Houdini colorbar HDA under "color options", set the menus like this...


Details:

png file /svs/share/houdini/cbars/images/png/simpleBlockycolor4.png
tex file /svs/share/houdini/cbars/images/tex/simpleBlockycolor4.tex
definition /svs/share/houdini/cbars/definitions/svs/simpleBlockycolor4.csv
credit unknown
reference unknown