Python: calculate lighter/darker RGB colors
Many times color palettes have lighter and darker variations of the same color. This may be used to convey relative importance, or for something as simple as a gradient. Usually the designer will specify both colors. However, if you have a site that needs to allow user configurable styling, you may not want to ask the user for two variations of the same color.
Here is some Python code to take a single color in RGB, and output an artitrarily lighter or darker variation of the same color. You could wrap this in a filter and use it right in your Django templates.
- def color_variant(hex_color, brightness_offset=1):
- """ takes a color like #87c95f and produces a lighter or darker variant """
- if len(hex_color) != 7:
- raise Exception("Passed %s into color_variant(), needs to be in #87c95f format." % hex_color)
- rgb_hex = [hex_color[x:x+2] for x in [1, 3, 5]]
- new_rgb_int = [int(hex_value, 16) + brightness_offset for hex_value in rgb_hex]
- new_rgb_int = [min([255, max([0, i])]) for i in new_rgb_int] # make sure new values are between 0 and 255
- # hex() produces "0x88", we want just "88"
- return "#" + "".join([hex(i)[2:] for i in new_rgb_int])
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