The MIDI velocity / CC value (depending on the button) determines the color of the Ableton Push as follows. Names were taking from Ableton's python scripts for the Push interface, which can be found @ https://github.com/gluon/AbletonLive9_RemoteScripts/blob/master/Push/Colors.py#L165
See also simplified list @ https://gist.github.com/adamjmurray/430a7a930305b315c48a
For more information on how to set Push colors in User Mode, see Julien Bayle's guide @ http://julienbayle.net/ableton-push/#usermode
The numbers below are the velocity value for MIDI note-based buttons, or the CC value for MIDI CC-based buttons (i.e. the top 2 rows above the 8x8 matrix).
PUSH COLORS
0 black / off
1 dark grey
2 grey
3 white
4 white-red (rose?)
5 red [bright]
6 red
7 red [dim]
8 red-amber
9 amber [bright]
10 amber
11 amber [dim]
12 amber-yellow
13 yellow [bright]
14 yellow
15 yellow [dim]
16 yellow-lime
17 lime [bright]
18 lime
19 lime [dim]
20 lime-greeinish
21 green [bright]
22 green
23 green [dim]
24 green-spring
25 spring [bright]
26 spring
27 spring [dim]
28 spring-turquoise
29 turquoise [bright]
30 turquoise
31 turquoise [dim]
32 turquoise-cyan
33 cyan [bright]
34 cyan
35 cyan [dim]
36 cyan-sky
37 sky [bright]
38 sky
39 sky [dim]
40 sky-ocean
41 ocean [bright]
42 ocean
43 ocean [dim]
44 ocean-blue
45 blue [bright]
46 blue
47 blue [dim]
48 blue-orchid
49 orchid [bright]
50 orchid
51 orchid [dim]
52 orchid-magenta
53 magenta [bright]
54 magenta
55 magenta [dim]
56 magenta-pink
57 pink [bright]
58 pink
59 pink [dim]
60 bright orange
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
I’m working on supporting Ableton Push as a control surface for Afterglow, an open source lighting control system, and I came across this gist while trying to figure out how to color the pads. It was very helpful, and I would like to contribute some additional discoveries I have made. I wanted to be able to approximate any color on a pad, so to get a deeper understanding of the palette, I rendered the first sixty note colors to the grid, starting at the bottom left. Doing so revealed something rather intriguing:
As others have described, the colors are in related groups of four, starting with a grayscale ramp from black to white. There has been some confusion about the nature of the first color in each subsequent group, including speculation that they might be a blend between the current and following group. But when laid out like this, it is evident that the first color is a desaturated (lightened, blended with white) version of the group color. Then we have three fully saturated versions of the color, in maximum, medium, and low brightness.
But what also struck me was the arrangement of the hues. The first group is red. Then it moves through the rainbow. It seemed that if we analyzed color in the hue-saturation-lightness color space, it might be possible to algorithmically translate any color to the best matching note value. And indeed, this turns out to be the case! My attempt at coding this up has allowed me to take any incoming color object, and come up with a good approximation of that color on an Push pad. The source is here but as an aid for people unfamiliar with Clojure (or Lisp-like languages), here is the algorithm in pseudocode:
I was delighted to find that Ableton had provided such a useful palette in the Push, and look forward to making use of it! I hope this information can help others, as well.