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July 13, 2017 20:23
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Scale a Hex color in Python
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# Adapted from Thadeus Burgess' Python 2 code | |
# http://thadeusb.com/weblog/2010/10/10/python_scale_hex_color/ | |
def clamp(val, minimum=0, maximum=255): | |
if val < minimum: | |
return minimum | |
if val > maximum: | |
return maximum | |
return val | |
def colorscale(hexstr, scalefactor): | |
""" | |
Scales a hex string by ``scalefactor``. Returns scaled hex string. | |
To darken the color, use a float value between 0 and 1. | |
To brighten the color, use a float value greater than 1. | |
>>> colorscale("#DF3C3C", .5) | |
#701E1E | |
>>> colorscale("#52D24F", 1.6) | |
#83FF7E | |
>>> colorscale("#4F75D2", 1) | |
#4F75D2 | |
""" | |
hexstr = hexstr.strip('#') | |
if scalefactor < 0 or len(hexstr) != 6: | |
return hexstr | |
r, g, b = int(hexstr[:2], 16), int(hexstr[2:4], 16), int(hexstr[4:], 16) | |
r = clamp(int(round(r * scalefactor))) | |
g = clamp(int(round(g * scalefactor))) | |
b = clamp(int(round(b * scalefactor))) | |
return '#{}{}{}'.format(hex(r)[2:], hex(g)[2:], hex(b)[2:]).upper() |
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