Generate random colors RGB

Question

I just picked up image processing in python this past week at the suggestion of a friend to generate patterns of random colors  I found this piece of script online that generates a wide array of different colors across the RGB spectrum   def random color        levels   range 32 256 32      return tuple random choice levels  for   in range 3     I am simply interesting in appending this script to only generate one of three random colors  Preferably red  green  and blue

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Output in the form of  r b g  its look like  255 155 100  from numpy import random color    random randint 0  255   random randint 0  255   random randint 0  255

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Here   def random color        rgbl  255 0 0      random shuffle rgbl      return tuple rgbl    The result is either red  green or blue  The method is not applicable to other sets of colors though  where you d have to build a list of all the colors you want to choose from and then use random choice to pick one at random

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You could also use Hex Color Code    Name    Hex Color Code  RGB Color Code Red      FF0000         rgb 255  0  0  Maroon   800000         rgb 128  0  0  Yellow   FFFF00         rgb 255  255  0  Olive    808000         rgb 128  128  0    For example  import matplotlib pyplot as plt import random  number of colors   8  color           join  random choice  0123456789ABCDEF   for j in range 6                 for i in range number of colors   print color       C7980A     F4651F     82D8A7     CC3A05     575E76     156943     0BD055     ACD338    Lets try plotting them in a scatter plot  for i in range number of colors       plt scatter random randint 0  10   random randint 0 10   c color i   s 200   plt show

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Taking a uniform random variable as the value of RGB may generate a large amount of gray  white  and black  which are often not the colors we want  The cv  applyColorMap can easily generate a random RGB palette  and you can choose a favorite color map from the list here Example for C  11   include  lt algorithm gt   include  lt numeric gt   include  lt random gt   include  lt opencv2 opencv hpp gt   std  random device rd  std  default random engine re rd         Generating randomized palette cv  Mat palette 1  255  CV 8U   std  iota palette data  palette data   255  0   std  shuffle palette data  palette data   255  re   cv  applyColorMap palette  palette  cv  COLORMAP JET               Picking random color from palette and drawing auto randColor   palette at lt cv  Vec3b gt  i   palette cols   cv  rectangle img  cv  Rect 0  0  100  100   randColor  -1    Example for Python3  import numpy as np  cv2  palette   np arange 0  255  dtype np uint8  reshape 1  255  1  palette   cv2 applyColorMap palette  cv2 COLORMAP JET  squeeze 0  np random shuffle palette         rand color   tuple palette i   palette shape 0   tolist    cv2 rectangle img   0  0    100  100   rand color  -1   If you don t need so many colors  you can just cut the palette to the desired length

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color   lambda    random randint 0  255   random randint 0  255   random randint 0  255

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A neat way to generate RGB triplets within the 256  aka 8-byte  range is  color   list np random choice range 256   size 3    color is now a list of size 3 with values in the range 0-255  You can save it in a list to record if the color has been generated before or no

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With custom colours  for example  dark red  dark green and dark blue    import random  COLORS     139  0  0               0  100  0              0  0  139    def random color        return random choice COLORS

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import random rgb full  quot   quot    str random randint 1 256       quot   quot    str random randint 1 256       quot   quot    str random randint 1 256       quot   quot

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Inspired by other answers this is more correct code that produces integer 0-255 values and appends alpha 255 if you need RGBA   tuple np random randint 256  size 3      255     If you just need RGB   tuple np random randint 256  size 3

[python] Generate random colors (RGB)

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