Test the RGB capabilities of your screen.

The best possible 'score' is: [01, FE, 7F, 81]. Typically there will be more detail in the grays - e.g. 7E and 82 are quite realistic values. But the full black and white? You will be lucky to get something better than F7 or 0B.

What is the first block that is distinguishable (lighter) from black?
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10

What is the first block that is distinguishable (darker) from white?
FF FE FD FC FB FA F9 F8 F7 F6 F5 F4 F3 F2 F1 F0 EF

What is the first block that is distinguishable (darker) from grey?
80 7F 7E 7D 7C 7B 7A 79 78 77 76 75 74 73 72 71 70

What is the first block that is distinguishable (lighter) from grey?
80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90

Detailed

Just in case none of the above blocks is distinguishable of the surrounding color, here are tests with bigger differences:

What is the first block that is distinguishable (lighter) from black?
00 03 06 09 0C 0F 12 15 18 1B 1E 21 24 27 2A 2D 30

What is the first block that is distinguishable (darker) from white?
FF FC F9 F6 F3 F0 ED EA E7 E4 E1 DE DB D8 D5 D2 CF

What is the first block that is distinguishable (darker) from grey?
80 7E 7C 7A 78 76 74 72 70 6E 6C 6A 68 66 64 62 60

What is the first block that is distinguishable (lighter) from grey?
80 82 84 86 88 8A 8C 8E 90 92 94 96 98 9A 9C 9E A0

Full scope

What is the first block that is distinguishable (darker) from white?
FF F9 F3 ED E7 E1 DB D5 CF C9 C3 BD B7 B1 AB A5 9F 99 93 8D 87 81 7B 75 6F 69 63 5D 57 51 4B 45 3F 39 33 2D 27 21 1B 15 0F 09 03


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Keywords
black, color, colour, contrast, couleur, dégradé, dark, degrade, dissolve, donker, fade, farbe, gradient, gradual, gray, grey, grijs, in, kleur, licht, light, out, overgang, pastel, tint, transient, transition, white, wit, zwart

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