diff --git a/volumina/colortables.py b/volumina/colortables.py
index 65dd19f9..39209c83 100644
--- a/volumina/colortables.py
+++ b/volumina/colortables.py
@@ -32,13 +32,11 @@
 will be displayed red and 1s black.
 
 """
-from __future__ import division
-
-from builtins import range
-from past.utils import old_div
-import warnings
 import itertools
+
 import numpy as np
+from past.utils import old_div
+
 from PyQt5.QtGui import QColor
 
 
@@ -94,304 +92,323 @@ def partlyJetTransparent(N=256, ratio=old_div(2.0, 3)):
     return colortable
 
 
-# taken from https://sashat.me/2017/01/11/list-of-20-simple-distinct-colors/
-default16_new = [
-    QColor(0, 0, 0, 0).rgba(),  # transparent
-    QColor(255, 225, 25).rgba(),  # yellow
-    QColor(0, 130, 200).rgba(),  # blue
-    QColor(230, 25, 75).rgba(),  # red
-    QColor(70, 240, 240).rgba(),  # cyan
-    QColor(60, 180, 75).rgba(),  # green
-    QColor(250, 190, 190).rgba(),  # pink
-    QColor(170, 110, 40).rgba(),  # brown
-    QColor(145, 30, 180).rgba(),  # purple
-    QColor(0, 128, 128).rgba(),  # teal
-    QColor(245, 130, 48).rgba(),  # orange
-    QColor(240, 50, 230).rgba(),  # magenta
-    QColor(210, 245, 60).rgba(),  # lime
-    QColor(255, 215, 180).rgba(),  # coral
-    QColor(230, 190, 255).rgba(),  # lavender
-    QColor(128, 128, 128).rgba(),  # gray
-]
-
-
-default16 = [
-    QColor(0, 0, 255).rgba(),
-    QColor(255, 255, 0).rgba(),
-    QColor(255, 0, 0).rgba(),
-    QColor(0, 255, 0).rgba(),
-    QColor(0, 255, 255).rgba(),
-    QColor(255, 0, 255).rgba(),
-    QColor(255, 105, 180).rgba(),  # hot pink
-    QColor(102, 205, 170).rgba(),  # dark aquamarine
-    QColor(165, 42, 42).rgba(),  # brown
-    QColor(0, 0, 128).rgba(),  # navy
-    QColor(255, 165, 0).rgba(),  # orange
-    QColor(173, 255, 47).rgba(),  # green-yellow
-    QColor(128, 0, 128).rgba(),  # purple
-    QColor(192, 192, 192).rgba(),  # silver
-    QColor(240, 230, 140).rgba(),  # khaki
-    QColor(69, 69, 69).rgba(),
-]  # dark grey
-
-random256 = [
-    QColor(201, 200, 200).rgba(),
-    QColor(0, 0, 255).rgba(),
-    QColor(255, 0, 0).rgba(),
-    QColor(0, 255, 0).rgba(),
-    QColor(20, 20, 192).rgba(),
-    QColor(255, 0, 182).rgba(),
-    QColor(0, 121, 0).rgba(),
-    QColor(255, 211, 0).rgba(),
-    QColor(0, 159, 255).rgba(),
-    QColor(154, 77, 66).rgba(),
-    QColor(0, 255, 190).rgba(),
-    QColor(120, 63, 193).rgba(),
-    QColor(31, 150, 152).rgba(),
-    QColor(255, 172, 253).rgba(),
-    QColor(177, 204, 113).rgba(),
-    QColor(241, 8, 92).rgba(),
-    QColor(254, 143, 66).rgba(),
-    QColor(221, 0, 255).rgba(),
-    QColor(32, 121, 1).rgba(),
-    QColor(114, 0, 85).rgba(),
-    QColor(118, 108, 149).rgba(),
-    QColor(2, 173, 36).rgba(),
-    QColor(200, 255, 0).rgba(),
-    QColor(136, 108, 0).rgba(),
-    QColor(255, 183, 159).rgba(),
-    QColor(133, 133, 103).rgba(),
-    QColor(161, 3, 0).rgba(),
-    QColor(20, 249, 255).rgba(),
-    QColor(0, 71, 158).rgba(),
-    QColor(220, 94, 147).rgba(),
-    QColor(147, 212, 255).rgba(),
-    QColor(0, 76, 255).rgba(),
-    QColor(0, 66, 80).rgba(),
-    QColor(57, 167, 106).rgba(),
-    QColor(238, 112, 254).rgba(),
-    QColor(0, 0, 100).rgba(),
-    QColor(171, 245, 204).rgba(),
-    QColor(161, 146, 255).rgba(),
-    QColor(164, 255, 115).rgba(),
-    QColor(255, 206, 113).rgba(),
-    QColor(124, 0, 21).rgba(),
-    QColor(212, 173, 197).rgba(),
-    QColor(251, 118, 111).rgba(),
-    QColor(171, 188, 0).rgba(),
-    QColor(117, 0, 215).rgba(),
-    QColor(166, 0, 154).rgba(),
-    QColor(0, 115, 254).rgba(),
-    QColor(165, 93, 174).rgba(),
-    QColor(98, 132, 2).rgba(),
-    QColor(0, 121, 168).rgba(),
-    QColor(0, 255, 131).rgba(),
-    QColor(86, 53, 0).rgba(),
-    QColor(159, 0, 63).rgba(),
-    QColor(145, 45, 66).rgba(),
-    QColor(255, 242, 187).rgba(),
-    QColor(0, 93, 67).rgba(),
-    QColor(252, 255, 124).rgba(),
-    QColor(159, 191, 186).rgba(),
-    QColor(167, 84, 19).rgba(),
-    QColor(74, 211, 108).rgba(),
-    QColor(0, 16, 243).rgba(),
-    QColor(145, 78, 109).rgba(),
-    QColor(207, 149, 0).rgba(),
-    QColor(195, 187, 255).rgba(),
-    QColor(253, 68, 64).rgba(),
-    QColor(66, 78, 32).rgba(),
-    QColor(192, 1, 0).rgba(),
-    QColor(181, 131, 84).rgba(),
-    QColor(132, 233, 147).rgba(),
-    QColor(96, 217, 0).rgba(),
-    QColor(255, 111, 211).rgba(),
-    QColor(229, 75, 63).rgba(),
-    QColor(254, 100, 0).rgba(),
-    QColor(228, 3, 127).rgba(),
-    QColor(17, 199, 174).rgba(),
-    QColor(210, 129, 139).rgba(),
-    QColor(91, 118, 124).rgba(),
-    QColor(32, 59, 106).rgba(),
-    QColor(180, 84, 255).rgba(),
-    QColor(226, 8, 210).rgba(),
-    QColor(0, 1, 184).rgba(),
-    QColor(93, 132, 68).rgba(),
-    QColor(50, 184, 163).rgba(),
-    QColor(97, 123, 201).rgba(),
-    QColor(98, 0, 122).rgba(),
-    QColor(126, 190, 58).rgba(),
-    QColor(0, 60, 183).rgba(),
-    QColor(255, 253, 0).rgba(),
-    QColor(7, 197, 226).rgba(),
-    QColor(180, 167, 57).rgba(),
-    QColor(148, 186, 138).rgba(),
-    QColor(204, 187, 160).rgba(),
-    QColor(55, 0, 224).rgba(),
-    QColor(0, 92, 1).rgba(),
-    QColor(150, 122, 129).rgba(),
-    QColor(39, 136, 38).rgba(),
-    QColor(206, 130, 180).rgba(),
-    QColor(150, 164, 196).rgba(),
-    QColor(180, 32, 128).rgba(),
-    QColor(110, 86, 180).rgba(),
-    QColor(147, 0, 185).rgba(),
-    QColor(199, 48, 61).rgba(),
-    QColor(115, 102, 255).rgba(),
-    QColor(15, 187, 253).rgba(),
-    QColor(172, 164, 100).rgba(),
-    QColor(182, 117, 250).rgba(),
-    QColor(216, 220, 254).rgba(),
-    QColor(87, 141, 113).rgba(),
-    QColor(216, 85, 34).rgba(),
-    QColor(0, 196, 103).rgba(),
-    QColor(243, 165, 105).rgba(),
-    QColor(216, 145, 182).rgba(),
-    QColor(1, 24, 219).rgba(),
-    QColor(52, 66, 54).rgba(),
-    QColor(255, 154, 0).rgba(),
-    QColor(87, 95, 1).rgba(),
-    QColor(198, 241, 79).rgba(),
-    QColor(255, 95, 133).rgba(),
-    QColor(123, 172, 240).rgba(),
-    QColor(120, 100, 49).rgba(),
-    QColor(162, 133, 204).rgba(),
-    QColor(105, 255, 220).rgba(),
-    QColor(198, 82, 100).rgba(),
-    QColor(121, 26, 64).rgba(),
-    QColor(0, 238, 70).rgba(),
-    QColor(231, 207, 69).rgba(),
-    QColor(217, 128, 233).rgba(),
-    QColor(255, 211, 87).rgba(),
-    QColor(209, 255, 141).rgba(),
-    QColor(108, 58, 3).rgba(),
-    QColor(87, 163, 193).rgba(),
-    QColor(211, 153, 116).rgba(),
-    QColor(203, 111, 79).rgba(),
-    QColor(62, 131, 0).rgba(),
-    QColor(0, 117, 223).rgba(),
-    QColor(112, 176, 88).rgba(),
-    QColor(209, 24, 0).rgba(),
-    QColor(0, 30, 107).rgba(),
-    QColor(105, 200, 197).rgba(),
-    QColor(255, 203, 255).rgba(),
-    QColor(233, 194, 137).rgba(),
-    QColor(191, 129, 46).rgba(),
-    QColor(69, 42, 145).rgba(),
-    QColor(171, 76, 194).rgba(),
-    QColor(14, 117, 61).rgba(),
-    QColor(0, 184, 25).rgba(),
-    QColor(118, 73, 127).rgba(),
-    QColor(255, 169, 200).rgba(),
-    QColor(94, 55, 217).rgba(),
-    QColor(238, 230, 138).rgba(),
-    QColor(159, 54, 33).rgba(),
-    QColor(80, 0, 148).rgba(),
-    QColor(189, 144, 128).rgba(),
-    QColor(0, 109, 126).rgba(),
-    QColor(88, 223, 96).rgba(),
-    QColor(71, 80, 103).rgba(),
-    QColor(1, 93, 159).rgba(),
-    QColor(99, 48, 60).rgba(),
-    QColor(2, 206, 148).rgba(),
-    QColor(139, 83, 37).rgba(),
-    QColor(171, 0, 255).rgba(),
-    QColor(141, 42, 135).rgba(),
-    QColor(85, 83, 148).rgba(),
-    QColor(150, 255, 0).rgba(),
-    QColor(0, 152, 123).rgba(),
-    QColor(255, 138, 203).rgba(),
-    QColor(222, 69, 200).rgba(),
-    QColor(107, 109, 230).rgba(),
-    QColor(30, 0, 150).rgba(),
-    QColor(173, 76, 138).rgba(),
-    QColor(255, 134, 161).rgba(),
-    QColor(0, 160, 155).rgba(),
-    QColor(138, 205, 0).rgba(),
-    QColor(111, 202, 157).rgba(),
-    QColor(225, 75, 253).rgba(),
-    QColor(255, 176, 77).rgba(),
-    QColor(229, 232, 57).rgba(),
-    QColor(114, 16, 255).rgba(),
-    QColor(111, 82, 101).rgba(),
-    QColor(134, 137, 48).rgba(),
-    QColor(99, 38, 80).rgba(),
-    QColor(105, 38, 32).rgba(),
-    QColor(200, 110, 0).rgba(),
-    QColor(209, 164, 255).rgba(),
-    QColor(198, 210, 86).rgba(),
-    QColor(79, 103, 77).rgba(),
-    QColor(174, 165, 166).rgba(),
-    QColor(170, 45, 101).rgba(),
-    QColor(199, 81, 175).rgba(),
-    QColor(255, 89, 172).rgba(),
-    QColor(146, 102, 78).rgba(),
-    QColor(102, 134, 184).rgba(),
-    QColor(111, 152, 255).rgba(),
-    QColor(92, 255, 159).rgba(),
-    QColor(172, 137, 178).rgba(),
-    QColor(210, 34, 98).rgba(),
-    QColor(199, 207, 147).rgba(),
-    QColor(255, 185, 30).rgba(),
-    QColor(250, 148, 141).rgba(),
-    QColor(49, 63, 145).rgba(),
-    QColor(254, 81, 97).rgba(),
-    QColor(254, 141, 100).rgba(),
-    QColor(134, 129, 224).rgba(),
-    QColor(201, 162, 84).rgba(),
-    QColor(199, 232, 240).rgba(),
-    QColor(68, 152, 0).rgba(),
-    QColor(147, 172, 58).rgba(),
-    QColor(22, 150, 28).rgba(),
-    QColor(8, 84, 121).rgba(),
-    QColor(116, 45, 0).rgba(),
-    QColor(104, 60, 255).rgba(),
-    QColor(64, 41, 147).rgba(),
-    QColor(164, 113, 215).rgba(),
-    QColor(207, 0, 155).rgba(),
-    QColor(118, 1, 35).rgba(),
-    QColor(83, 0, 88).rgba(),
-    QColor(0, 82, 232).rgba(),
-    QColor(43, 92, 87).rgba(),
-    QColor(160, 217, 146).rgba(),
-    QColor(176, 26, 229).rgba(),
-    QColor(29, 3, 155).rgba(),
-    QColor(122, 58, 159).rgba(),
-    QColor(100, 120, 240).rgba(),
-    QColor(160, 100, 105).rgba(),
-    QColor(106, 157, 160).rgba(),
-    QColor(153, 219, 113).rgba(),
-    QColor(192, 56, 207).rgba(),
-    QColor(125, 255, 89).rgba(),
-    QColor(149, 0, 34).rgba(),
-    QColor(213, 162, 223).rgba(),
-    QColor(22, 131, 204).rgba(),
-    QColor(166, 249, 69).rgba(),
-    QColor(109, 105, 97).rgba(),
-    QColor(86, 188, 78).rgba(),
-    QColor(255, 109, 81).rgba(),
-    QColor(255, 3, 248).rgba(),
-    QColor(255, 0, 73).rgba(),
-    QColor(202, 0, 35).rgba(),
-    QColor(67, 109, 18).rgba(),
-    QColor(234, 170, 173).rgba(),
-    QColor(191, 165, 0).rgba(),
-    QColor(38, 145, 51).rgba(),
-    QColor(85, 185, 2).rgba(),
-    QColor(121, 182, 158).rgba(),
-    QColor(254, 236, 212).rgba(),
-    QColor(139, 165, 89).rgba(),
-    QColor(141, 254, 193).rgba(),
-    QColor(0, 134, 43).rgba(),
-    QColor(174, 17, 40).rgba(),
-    QColor(255, 221, 246).rgba(),
-    QColor(17, 26, 146).rgba(),
-    QColor(154, 66, 84).rgba(),
-    QColor(149, 157, 238).rgba(),
-    QColor(126, 130, 72).rgba(),
-    QColor(58, 6, 184).rgba(),
-    QColor(240, 4, 7).rgba(),
-]
+def create_default_16_new():
+    """
+    Returns a list of our "new" default set of 16 distinct colors.
+    Ensures that every call of this function creates a new instance of the same list.
+    """
+    # taken from https://sashat.me/2017/01/11/list-of-20-simple-distinct-colors/
+    return [
+        QColor(0, 0, 0, 0).rgba(),  # transparent
+        QColor(255, 225, 25).rgba(),  # yellow
+        QColor(0, 130, 200).rgba(),  # blue
+        QColor(230, 25, 75).rgba(),  # red
+        QColor(70, 240, 240).rgba(),  # cyan
+        QColor(60, 180, 75).rgba(),  # green
+        QColor(250, 190, 190).rgba(),  # pink
+        QColor(170, 110, 40).rgba(),  # brown
+        QColor(145, 30, 180).rgba(),  # purple
+        QColor(0, 128, 128).rgba(),  # teal
+        QColor(245, 130, 48).rgba(),  # orange
+        QColor(240, 50, 230).rgba(),  # magenta
+        QColor(210, 245, 60).rgba(),  # lime
+        QColor(255, 215, 180).rgba(),  # coral
+        QColor(230, 190, 255).rgba(),  # lavender
+        QColor(128, 128, 128).rgba(),  # gray
+    ]
+
+
+def create_default_16():
+    """
+    Returns a list of our ("old") default set of 16 distinct colors.
+    Ensures that every call of this function creates a new instance of the same list.
+    """
+    return [
+        QColor(0, 0, 255).rgba(),
+        QColor(255, 255, 0).rgba(),
+        QColor(255, 0, 0).rgba(),
+        QColor(0, 255, 0).rgba(),
+        QColor(0, 255, 255).rgba(),
+        QColor(255, 0, 255).rgba(),
+        QColor(255, 105, 180).rgba(),  # hot pink
+        QColor(102, 205, 170).rgba(),  # dark aquamarine
+        QColor(165, 42, 42).rgba(),  # brown
+        QColor(0, 0, 128).rgba(),  # navy
+        QColor(255, 165, 0).rgba(),  # orange
+        QColor(173, 255, 47).rgba(),  # green-yellow
+        QColor(128, 0, 128).rgba(),  # purple
+        QColor(192, 192, 192).rgba(),  # silver
+        QColor(240, 230, 140).rgba(),  # khaki
+        QColor(69, 69, 69).rgba(),  # dark grey
+    ]
+
+
+def create_random256():
+    return [
+        QColor(201, 200, 200).rgba(),
+        QColor(0, 0, 255).rgba(),
+        QColor(255, 0, 0).rgba(),
+        QColor(0, 255, 0).rgba(),
+        QColor(20, 20, 192).rgba(),
+        QColor(255, 0, 182).rgba(),
+        QColor(0, 121, 0).rgba(),
+        QColor(255, 211, 0).rgba(),
+        QColor(0, 159, 255).rgba(),
+        QColor(154, 77, 66).rgba(),
+        QColor(0, 255, 190).rgba(),
+        QColor(120, 63, 193).rgba(),
+        QColor(31, 150, 152).rgba(),
+        QColor(255, 172, 253).rgba(),
+        QColor(177, 204, 113).rgba(),
+        QColor(241, 8, 92).rgba(),
+        QColor(254, 143, 66).rgba(),
+        QColor(221, 0, 255).rgba(),
+        QColor(32, 121, 1).rgba(),
+        QColor(114, 0, 85).rgba(),
+        QColor(118, 108, 149).rgba(),
+        QColor(2, 173, 36).rgba(),
+        QColor(200, 255, 0).rgba(),
+        QColor(136, 108, 0).rgba(),
+        QColor(255, 183, 159).rgba(),
+        QColor(133, 133, 103).rgba(),
+        QColor(161, 3, 0).rgba(),
+        QColor(20, 249, 255).rgba(),
+        QColor(0, 71, 158).rgba(),
+        QColor(220, 94, 147).rgba(),
+        QColor(147, 212, 255).rgba(),
+        QColor(0, 76, 255).rgba(),
+        QColor(0, 66, 80).rgba(),
+        QColor(57, 167, 106).rgba(),
+        QColor(238, 112, 254).rgba(),
+        QColor(0, 0, 100).rgba(),
+        QColor(171, 245, 204).rgba(),
+        QColor(161, 146, 255).rgba(),
+        QColor(164, 255, 115).rgba(),
+        QColor(255, 206, 113).rgba(),
+        QColor(124, 0, 21).rgba(),
+        QColor(212, 173, 197).rgba(),
+        QColor(251, 118, 111).rgba(),
+        QColor(171, 188, 0).rgba(),
+        QColor(117, 0, 215).rgba(),
+        QColor(166, 0, 154).rgba(),
+        QColor(0, 115, 254).rgba(),
+        QColor(165, 93, 174).rgba(),
+        QColor(98, 132, 2).rgba(),
+        QColor(0, 121, 168).rgba(),
+        QColor(0, 255, 131).rgba(),
+        QColor(86, 53, 0).rgba(),
+        QColor(159, 0, 63).rgba(),
+        QColor(145, 45, 66).rgba(),
+        QColor(255, 242, 187).rgba(),
+        QColor(0, 93, 67).rgba(),
+        QColor(252, 255, 124).rgba(),
+        QColor(159, 191, 186).rgba(),
+        QColor(167, 84, 19).rgba(),
+        QColor(74, 211, 108).rgba(),
+        QColor(0, 16, 243).rgba(),
+        QColor(145, 78, 109).rgba(),
+        QColor(207, 149, 0).rgba(),
+        QColor(195, 187, 255).rgba(),
+        QColor(253, 68, 64).rgba(),
+        QColor(66, 78, 32).rgba(),
+        QColor(192, 1, 0).rgba(),
+        QColor(181, 131, 84).rgba(),
+        QColor(132, 233, 147).rgba(),
+        QColor(96, 217, 0).rgba(),
+        QColor(255, 111, 211).rgba(),
+        QColor(229, 75, 63).rgba(),
+        QColor(254, 100, 0).rgba(),
+        QColor(228, 3, 127).rgba(),
+        QColor(17, 199, 174).rgba(),
+        QColor(210, 129, 139).rgba(),
+        QColor(91, 118, 124).rgba(),
+        QColor(32, 59, 106).rgba(),
+        QColor(180, 84, 255).rgba(),
+        QColor(226, 8, 210).rgba(),
+        QColor(0, 1, 184).rgba(),
+        QColor(93, 132, 68).rgba(),
+        QColor(50, 184, 163).rgba(),
+        QColor(97, 123, 201).rgba(),
+        QColor(98, 0, 122).rgba(),
+        QColor(126, 190, 58).rgba(),
+        QColor(0, 60, 183).rgba(),
+        QColor(255, 253, 0).rgba(),
+        QColor(7, 197, 226).rgba(),
+        QColor(180, 167, 57).rgba(),
+        QColor(148, 186, 138).rgba(),
+        QColor(204, 187, 160).rgba(),
+        QColor(55, 0, 224).rgba(),
+        QColor(0, 92, 1).rgba(),
+        QColor(150, 122, 129).rgba(),
+        QColor(39, 136, 38).rgba(),
+        QColor(206, 130, 180).rgba(),
+        QColor(150, 164, 196).rgba(),
+        QColor(180, 32, 128).rgba(),
+        QColor(110, 86, 180).rgba(),
+        QColor(147, 0, 185).rgba(),
+        QColor(199, 48, 61).rgba(),
+        QColor(115, 102, 255).rgba(),
+        QColor(15, 187, 253).rgba(),
+        QColor(172, 164, 100).rgba(),
+        QColor(182, 117, 250).rgba(),
+        QColor(216, 220, 254).rgba(),
+        QColor(87, 141, 113).rgba(),
+        QColor(216, 85, 34).rgba(),
+        QColor(0, 196, 103).rgba(),
+        QColor(243, 165, 105).rgba(),
+        QColor(216, 145, 182).rgba(),
+        QColor(1, 24, 219).rgba(),
+        QColor(52, 66, 54).rgba(),
+        QColor(255, 154, 0).rgba(),
+        QColor(87, 95, 1).rgba(),
+        QColor(198, 241, 79).rgba(),
+        QColor(255, 95, 133).rgba(),
+        QColor(123, 172, 240).rgba(),
+        QColor(120, 100, 49).rgba(),
+        QColor(162, 133, 204).rgba(),
+        QColor(105, 255, 220).rgba(),
+        QColor(198, 82, 100).rgba(),
+        QColor(121, 26, 64).rgba(),
+        QColor(0, 238, 70).rgba(),
+        QColor(231, 207, 69).rgba(),
+        QColor(217, 128, 233).rgba(),
+        QColor(255, 211, 87).rgba(),
+        QColor(209, 255, 141).rgba(),
+        QColor(108, 58, 3).rgba(),
+        QColor(87, 163, 193).rgba(),
+        QColor(211, 153, 116).rgba(),
+        QColor(203, 111, 79).rgba(),
+        QColor(62, 131, 0).rgba(),
+        QColor(0, 117, 223).rgba(),
+        QColor(112, 176, 88).rgba(),
+        QColor(209, 24, 0).rgba(),
+        QColor(0, 30, 107).rgba(),
+        QColor(105, 200, 197).rgba(),
+        QColor(255, 203, 255).rgba(),
+        QColor(233, 194, 137).rgba(),
+        QColor(191, 129, 46).rgba(),
+        QColor(69, 42, 145).rgba(),
+        QColor(171, 76, 194).rgba(),
+        QColor(14, 117, 61).rgba(),
+        QColor(0, 184, 25).rgba(),
+        QColor(118, 73, 127).rgba(),
+        QColor(255, 169, 200).rgba(),
+        QColor(94, 55, 217).rgba(),
+        QColor(238, 230, 138).rgba(),
+        QColor(159, 54, 33).rgba(),
+        QColor(80, 0, 148).rgba(),
+        QColor(189, 144, 128).rgba(),
+        QColor(0, 109, 126).rgba(),
+        QColor(88, 223, 96).rgba(),
+        QColor(71, 80, 103).rgba(),
+        QColor(1, 93, 159).rgba(),
+        QColor(99, 48, 60).rgba(),
+        QColor(2, 206, 148).rgba(),
+        QColor(139, 83, 37).rgba(),
+        QColor(171, 0, 255).rgba(),
+        QColor(141, 42, 135).rgba(),
+        QColor(85, 83, 148).rgba(),
+        QColor(150, 255, 0).rgba(),
+        QColor(0, 152, 123).rgba(),
+        QColor(255, 138, 203).rgba(),
+        QColor(222, 69, 200).rgba(),
+        QColor(107, 109, 230).rgba(),
+        QColor(30, 0, 150).rgba(),
+        QColor(173, 76, 138).rgba(),
+        QColor(255, 134, 161).rgba(),
+        QColor(0, 160, 155).rgba(),
+        QColor(138, 205, 0).rgba(),
+        QColor(111, 202, 157).rgba(),
+        QColor(225, 75, 253).rgba(),
+        QColor(255, 176, 77).rgba(),
+        QColor(229, 232, 57).rgba(),
+        QColor(114, 16, 255).rgba(),
+        QColor(111, 82, 101).rgba(),
+        QColor(134, 137, 48).rgba(),
+        QColor(99, 38, 80).rgba(),
+        QColor(105, 38, 32).rgba(),
+        QColor(200, 110, 0).rgba(),
+        QColor(209, 164, 255).rgba(),
+        QColor(198, 210, 86).rgba(),
+        QColor(79, 103, 77).rgba(),
+        QColor(174, 165, 166).rgba(),
+        QColor(170, 45, 101).rgba(),
+        QColor(199, 81, 175).rgba(),
+        QColor(255, 89, 172).rgba(),
+        QColor(146, 102, 78).rgba(),
+        QColor(102, 134, 184).rgba(),
+        QColor(111, 152, 255).rgba(),
+        QColor(92, 255, 159).rgba(),
+        QColor(172, 137, 178).rgba(),
+        QColor(210, 34, 98).rgba(),
+        QColor(199, 207, 147).rgba(),
+        QColor(255, 185, 30).rgba(),
+        QColor(250, 148, 141).rgba(),
+        QColor(49, 63, 145).rgba(),
+        QColor(254, 81, 97).rgba(),
+        QColor(254, 141, 100).rgba(),
+        QColor(134, 129, 224).rgba(),
+        QColor(201, 162, 84).rgba(),
+        QColor(199, 232, 240).rgba(),
+        QColor(68, 152, 0).rgba(),
+        QColor(147, 172, 58).rgba(),
+        QColor(22, 150, 28).rgba(),
+        QColor(8, 84, 121).rgba(),
+        QColor(116, 45, 0).rgba(),
+        QColor(104, 60, 255).rgba(),
+        QColor(64, 41, 147).rgba(),
+        QColor(164, 113, 215).rgba(),
+        QColor(207, 0, 155).rgba(),
+        QColor(118, 1, 35).rgba(),
+        QColor(83, 0, 88).rgba(),
+        QColor(0, 82, 232).rgba(),
+        QColor(43, 92, 87).rgba(),
+        QColor(160, 217, 146).rgba(),
+        QColor(176, 26, 229).rgba(),
+        QColor(29, 3, 155).rgba(),
+        QColor(122, 58, 159).rgba(),
+        QColor(100, 120, 240).rgba(),
+        QColor(160, 100, 105).rgba(),
+        QColor(106, 157, 160).rgba(),
+        QColor(153, 219, 113).rgba(),
+        QColor(192, 56, 207).rgba(),
+        QColor(125, 255, 89).rgba(),
+        QColor(149, 0, 34).rgba(),
+        QColor(213, 162, 223).rgba(),
+        QColor(22, 131, 204).rgba(),
+        QColor(166, 249, 69).rgba(),
+        QColor(109, 105, 97).rgba(),
+        QColor(86, 188, 78).rgba(),
+        QColor(255, 109, 81).rgba(),
+        QColor(255, 3, 248).rgba(),
+        QColor(255, 0, 73).rgba(),
+        QColor(202, 0, 35).rgba(),
+        QColor(67, 109, 18).rgba(),
+        QColor(234, 170, 173).rgba(),
+        QColor(191, 165, 0).rgba(),
+        QColor(38, 145, 51).rgba(),
+        QColor(85, 185, 2).rgba(),
+        QColor(121, 182, 158).rgba(),
+        QColor(254, 236, 212).rgba(),
+        QColor(139, 165, 89).rgba(),
+        QColor(141, 254, 193).rgba(),
+        QColor(0, 134, 43).rgba(),
+        QColor(174, 17, 40).rgba(),
+        QColor(255, 221, 246).rgba(),
+        QColor(17, 26, 146).rgba(),
+        QColor(154, 66, 84).rgba(),
+        QColor(149, 157, 238).rgba(),
+        QColor(126, 130, 72).rgba(),
+        QColor(58, 6, 184).rgba(),
+        QColor(240, 4, 7).rgba(),
+    ]
+
+
+default16_new = create_default_16_new()  # Kept for compatibility; remove if no longer used by ilastik
+
+default16 = create_default_16()  # Kept for compatibility; remove if no longer used by ilastik
+
+random256 = create_random256()  # Kept for compatibility; remove if no longer used by ilastik
 
 
 def create_default_8bit():
@@ -400,6 +417,7 @@ def create_default_8bit():
     Repeatedly applies the default16 colortable to the whole 8bit range.
 
     """
+    # Appears to be unused - candidate for removal
     return [color for color in itertools.islice(itertools.cycle(default16), 0, 2**8)]
 
 
@@ -416,7 +434,8 @@ def create_random_8bit():
     """Create a colortable suitable for 8bit data.
 
     Creates a pseudo-random colortable in the 8bit range"""
-    return random256
+    # Appears to be unused - candidate for removal
+    return create_random256()
 
 
 def create_random_16bit():
@@ -429,7 +448,6 @@ def create_random_16bit():
 if __name__ == "__main__":
     from volumina.api import *
     from PyQt5.QtWidgets import QApplication
-    import numpy
     from volumina.pixelpipeline.datasourcefactories import *
 
     app = QApplication(sys.argv)