code: def __init__(self, alpha=1.0, **kwargs):
      super(Alpha, self).__init__(fcode=self.FRAG_SHADER, **kwargs)
  
      self.alpha = alpha
  
imports: from .base_filter import Filter
  from ..shaders import Function, Varying
  from ...color import colormap, Color
label_desc: Use image node_id 1 to create a new Alpha object from inherited base classes: Filter with example: obj = Alpha(alpha)