Question

我想知道如何获取颜色取决于[0-100]之间的值，其中0为红色，1为绿色，我希望它们之间的值为红色和绿色之间的插值颜色（橙色，黄色。 ..，..）。我在Blender 3D中使用python。下面的代码行可以生成彩虹色，如here所示，但我想知道如何将它设置为仅在红色，黄色和绿色之间以及如何控制我的颜色范围（0-100）

import colorsys
(r, g, b) = colorsys.hsv_to_rgb(float(depth) / maxd, 1.0, 1.0)
R, G, B = int(255 * r), int(255 * g), int(255 * b)

Answer 1

易。在colorsys使用的0 - 1比例上，红色的色调为0，绿色的色调为1/3，因此您只需要将[0 - 100]范围内的数字减少到[0] - 1/3]间隔除以。

像这样：

import colorsys

for i in range(101):
    rgb = colorsys.hsv_to_rgb(i / 300., 1.0, 1.0)
    print(i, [round(255*x) for x in rgb])

<强>输出

0 [255, 0, 0]
1 [255, 5, 0]
2 [255, 10, 0]
3 [255, 15, 0]
4 [255, 20, 0]
5 [255, 25, 0]
6 [255, 31, 0]
7 [255, 36, 0]
8 [255, 41, 0]
9 [255, 46, 0]
10 [255, 51, 0]
11 [255, 56, 0]
12 [255, 61, 0]
13 [255, 66, 0]
14 [255, 71, 0]
15 [255, 77, 0]
16 [255, 82, 0]
17 [255, 87, 0]
18 [255, 92, 0]
19 [255, 97, 0]
20 [255, 102, 0]
21 [255, 107, 0]
22 [255, 112, 0]
23 [255, 117, 0]
24 [255, 122, 0]
25 [255, 128, 0]
26 [255, 133, 0]
27 [255, 138, 0]
28 [255, 143, 0]
29 [255, 148, 0]
30 [255, 153, 0]
31 [255, 158, 0]
32 [255, 163, 0]
33 [255, 168, 0]
34 [255, 173, 0]
35 [255, 178, 0]
36 [255, 184, 0]
37 [255, 189, 0]
38 [255, 194, 0]
39 [255, 199, 0]
40 [255, 204, 0]
41 [255, 209, 0]
42 [255, 214, 0]
43 [255, 219, 0]
44 [255, 224, 0]
45 [255, 229, 0]
46 [255, 235, 0]
47 [255, 240, 0]
48 [255, 245, 0]
49 [255, 250, 0]
50 [255, 255, 0]
51 [250, 255, 0]
52 [245, 255, 0]
53 [240, 255, 0]
54 [235, 255, 0]
55 [230, 255, 0]
56 [224, 255, 0]
57 [219, 255, 0]
58 [214, 255, 0]
59 [209, 255, 0]
60 [204, 255, 0]
61 [199, 255, 0]
62 [194, 255, 0]
63 [189, 255, 0]
64 [184, 255, 0]
65 [178, 255, 0]
66 [173, 255, 0]
67 [168, 255, 0]
68 [163, 255, 0]
69 [158, 255, 0]
70 [153, 255, 0]
71 [148, 255, 0]
72 [143, 255, 0]
73 [138, 255, 0]
74 [133, 255, 0]
75 [128, 255, 0]
76 [122, 255, 0]
77 [117, 255, 0]
78 [112, 255, 0]
79 [107, 255, 0]
80 [102, 255, 0]
81 [97, 255, 0]
82 [92, 255, 0]
83 [87, 255, 0]
84 [82, 255, 0]
85 [77, 255, 0]
86 [71, 255, 0]
87 [66, 255, 0]
88 [61, 255, 0]
89 [56, 255, 0]
90 [51, 255, 0]
91 [46, 255, 0]
92 [41, 255, 0]
93 [36, 255, 0]
94 [31, 255, 0]
95 [26, 255, 0]
96 [20, 255, 0]
97 [15, 255, 0]
98 [10, 255, 0]
99 [5, 255, 0]
100 [0, 255, 0]

Answer 2

HSV和HSL色彩空间允许您独立于其他参数选择色调。如果你知道你所追求的hues的连续范围，你可以轻松地将[0,1]映射到该集合：

def get_color(red_to_green):
    assert 0 <= red_to_green <= 1
    # in HSV, red is 0 deg and green is 120 deg (out of 360);
    # divide red_to_green with 3 to map [0, 1] to [0, 1./3.]
    hue = red_to_green / 3.0
    r, g, b = colorsys.hsv_to_rgb(hue, 1, 1)
    return map(lambda x: int(255 * x), (r, g, b))

结果很容易测试：

>>> get_color(0)
[255, 0, 0]
>>> get_color(0.2)
[255, 102, 0]
>>> get_color(0.5)
[255, 255, 0]
>>> get_color(0.7)
[153, 255, 0]
>>> get_color(1)
[0, 255, 0]

颜色范围Python

2 个答案: