I code stuff. I raise bees. I game.

## Scale a hex color in Python

Since scaling a hex value RGB color is such a straightforward problem, I was surprised there were not any examples on the Internet.

1. Convert hex values to integers
2. Multiply by the scale factor
• float > 1 for lighter
• float < 1 for darker
```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)
#6F1E1E
>>> 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(r * scalefactor)
g = clamp(g * scalefactor)
b = clamp(b * scalefactor)

return "#%02x%02x%02x" % (r, g, b)
```