Python – colorsys.hsv_to_rgb returning a float value

Question

Why is hsv_to_rgb returning a float value for this? and only for g and b?

import colorsys
from colorsys import *

colorRGB = (255,0,255)
print(colorRGB)
colorHSV = rgb_to_hsv(colorRGB[0],colorRGB[1],colorRGB[2])
colorRGB = hsv_to_rgb(colorHSV[0],colorHSV[1],colorHSV[2])
print(colorRGB)

(255, 0, 255)
(255, 0.0, 255.0)
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Asked By: Renaud Futterer

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Source

Answer 1

Solution

You need to rescale RGB values 0 to 255 between 0 to 1 first.
Section Code Modification below gives you a modified version of your code that will run bug-free.

If you try this, you would realize what is happening.

# we provide r, g, b values ranging between 0 and 1 for each.
colorsys.hsv_to_rgb(*colorsys.rgb_to_hsv(1,0,0))

Output:

(1, 0.0, 0.0)

Code Modification

I would change your code as follows (rescale 0-255 between 0-1):

from colorsys import hsv_to_rgb, rgb_to_hsv

colorRGB = (255,0,255)
colorRGB = tuple(x/255 for x in colorRGB)

print(f'colorRGB: {colorRGB}')
colorHSV = rgb_to_hsv(*colorRGB)
colorRGB = hsv_to_rgb(*colorHSV)
print(f'colorRGB: {colorRGB}')

Output:

colorRGB: (1.0, 0.0, 1.0)
colorRGB: (1.0, 0.0, 1.0)

Answered By: CypherX

Answer 2

If You explore colorsys library code, You will observe function rgv_to_hsv and hsv_to_rgv code. You will observe there are multiple divisions and float multiplication happening. This is the reason it is library is returning float value.

You can convert float to int as:

colorRGB = list(map(int, hsv_to_rgb(colorHSV[0],colorHSV[1],colorHSV[2])))

Answered By: Shivam Seth

Python – colorsys.hsv_to_rgb returning a float value

Question:

Answers:

Solution

Code Modification

You can convert float to int as: