# Python Colorsys Module

The `colorsys` module defines bidirectional conversions of color values between colors expressed in the RGB (Red Green Blue) color space used in computer monitors and three other coordinate systems: YIQ, HLS (Hue Lightness Saturation) and HSV (Hue Saturation Value).

Coordinates in all of these color spaces are floating point values. In the YIQ space, the Y coordinate is between 0 and 1, but the I and Q coordinates can be positive or negative. In all other spaces, the coordinates are all between 0 and 1.

## Importing the Module

```python
import colorsys
```

## Conversions

### RGB to YIQ and back

YIQ is the color space used by the NTSC video standard.

```python
import colorsys

# RGB to YIQ
r, g, b = 0.2, 0.4, 0.4
y, i, q = colorsys.rgb_to_yiq(r, g, b)
print(f"YIQ: {y:.2f}, {i:.2f}, {q:.2f}")

# YIQ to RGB
r_out, g_out, b_out = colorsys.yiq_to_rgb(y, i, q)
print(f"RGB: {r_out:.2f}, {g_out:.2f}, {b_out:.2f}")
```

### RGB to HLS and back

HLS stands for Hue, Lightness, Saturation.

```python
import colorsys

# RGB to HLS
r, g, b = 0.2, 0.4, 0.4
h, l, s = colorsys.rgb_to_hls(r, g, b)
print(f"HLS: {h:.2f}, {l:.2f}, {s:.2f}")

# HLS to RGB
r_out, g_out, b_out = colorsys.hls_to_rgb(h, l, s)
print(f"RGB: {r_out:.2f}, {g_out:.2f}, {b_out:.2f}")
```

### RGB to HSV and back

HSV stands for Hue, Saturation, Value.

```python
import colorsys

# RGB to HSV
r, g, b = 0.2, 0.4, 0.4
h, s, v = colorsys.rgb_to_hsv(r, g, b)
print(f"HSV: {h:.2f}, {s:.2f}, {v:.2f}")

# HSV to RGB
r_out, g_out, b_out = colorsys.hsv_to_rgb(h, s, v)
print(f"RGB: {r_out:.2f}, {g_out:.2f}, {b_out:.2f}")
```

[[programming/python/python]]