utils/colors.py

import colorsys

def hex_to_rgb(hex_color):
    """Convert hex color to RGB tuple."""
    hex_color = hex_color.lstrip('#')
    return tuple(int(hex_color[i:i+2], 16) / 255.0 for i in (0, 2, 4))
def rgb_to_hex(rgb_color):
    """Convert RGB tuple to hex color."""
    return "#{:02x}{:02x}{:02x}".format(int(rgb_color[0] * 255), int(rgb_color[1] * 255), int(rgb_color[2] * 255))


def interpolate_color(val, minval, maxval, start_hex, end_hex):
    """Interpolate color between two hex colors given a value between minval and maxval."""
    start_color = hex_to_rgb(start_hex)
    end_color = hex_to_rgb(end_hex)
    
    # Normalize value to range 0-1
    f = float(val - minval) / (maxval - minval)
    
    # Convert start and end colors to HSV
    start_color_hsv = colorsys.rgb_to_hsv(*start_color)
    end_color_hsv = colorsys.rgb_to_hsv(*end_color)
    
    # Interpolate HSV values
    interpolated_hsv = tuple(start + f * (end - start) for start, end in zip(start_color_hsv, end_color_hsv))
    
    # Convert interpolated HSV back to RGB
    interpolated_rgb = colorsys.hsv_to_rgb(*interpolated_hsv)
    
    # Convert RGB values to hex
    return rgb_to_hex(interpolated_rgb)
def reduce_hsv_color_v(hex_color, factor):
    """Reduce the value (brightness) of a color in HSV color space."""
    rgb_color = hex_to_rgb(hex_color)
    hsv_color = colorsys.rgb_to_hsv(*rgb_color)
    reduced_hsv_color = (hsv_color[0], hsv_color[1] * factor, hsv_color[2])
    reduced_rgb_color = colorsys.hsv_to_rgb(*reduced_hsv_color)
    return rgb_to_hex(reduced_rgb_color)