How to Recolor Black Using CSS Filters to Match Any RGB Color?

How to transform black into any given color using only CSS filters

Problem: Given a target RGB color, how do you recolor black (#000) into that color using only CSS filters?

Solution: Use the following function to convert a target RGB color into a CSS filter string:

<code class="python">def css_filter(target_color):
  """Converts a target RGB color into a CSS filter string.

  Args:
    target_color: A tuple of three integers representing the target RGB color.

  Returns:
    A CSS filter string that transforms black into the target color.
  """

  # Convert the target RGB color to HSL.
  h, s, l = colorsys.rgb_to_hls(*target_color)

  # Calculate the CSS filter values.
  invert = 1 - (l / 100)
  sepia = 1 - s
  saturate = s / 100
  hue_rotate = h * 360
  brightness = l
  contrast = 1

  # Return the CSS filter string.
  return "filter: invert({0}%) sepia({1}%) saturate({2}%) hue-rotate({3}deg) brightness({4}%) contrast({5});".format(
      invert, sepia, saturate, hue_rotate, brightness, contrast)</code>

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