code: def to_linear(c):
      a = 0.055
  
      if c > 0.04045:
          return math.pow((c + a) / (1.0 + a), 2.4)
      else:
          return c / 12.92
  
imports: import operator
  import math
label_desc: Use image node_id 18 for calling a global function with example usage: to_linear(c) and returns: math, unknown