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colorsys module in Python
This module allows bidirectional conversions of color values between colors expressed in the RGB (Red Green Blue) and other color spaces. The three other color spaces it uses are YIQ (Luminance (Y) In-phase Quadrature), HLS (Hue Lightness Saturation) and HSV (Hue Saturation Value). All the coordinates can be between 0 and 1 except the I and Q values in the YIQ color space.
The below tables shows the functions and their purpose.
| Function | Purpose | Permitted Values |
|---|---|---|
| rgb_to_yiq | from RGB coordinates to YIQ coordinates | 0 to 1 |
| rgb_to_hls | from RGB coordinates to HLS coordinates | 0 to 1 |
| rgb_to_hsv | from RGB coordinates to HSV coordinates | 0 to 1 |
| yiq_to_rgb | from YIQ coordinates to RGB coordinates | -1 to 1 |
| hls_to_rgb | from HLS coordinates to RGB coordinates | 0 to 1 |
| hsv_to_rgb | from HSV coordinates to RGB coordinates | 0 to 1 |
Example
import colorsys as csys
# "Electric Blue"
r, g, b = 0.47, 0.91, 1.00
print("The RGB Values for Electric Blue: ", (r, g, b))
#
y, i, q = csys.rgb_to_yiq(r, g, b)
print("YIQ", (y, i, q), "becomes", csys.yiq_to_rgb(y, i, q))
h, s, v = csys.rgb_to_hsv(r, g, b)
print("HSV", (h, s, v), "becomes", csys.hsv_to_rgb(h, s, v))
h, l, s = csys.rgb_to_hls(r, g, b)
print("HLS", (h, l, s), "becomes", csys.hls_to_rgb(h, l, s))
Output
Running the above code gives us the following result:
The RGB Values for Electric Blue: (0.47, 0.91, 1.0) YIQ (0.7879, -0.292513, -0.06563100000000005) becomes (0.47, 0.9100000000000001, 1.0) HSV (0.5283018867924528, 0.53, 1.0) becomes (0.47, 0.9099999999999999, 1.0) HLS (0.5283018867924528, 0.735, 1.0) becomes (0.4700000000000001, 0.9099999999999998, 0.9999999999999999)
Updated on: 17-Oct-2019
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