colortest-python(1) on Linux
The text 454510272994, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Display color test chart and convert between color values
Flags it lists
-
--256to88 -
--88to256 -
--block -
--cube-slice -
--foreground -
--help -
--hex -
--horizontal -
--numbers -
--padding -
--rgb -
--version -
--vertical -
-b -
-c -
-e -
-f -
-h -
-l -
-n -
-p -
-r -
-v -
-x -
-z