class_docstr: Generic wrapper for any photometric transforms.
  These transformations should only affect the color space and
      not the coordinate space of the image (e.g. annotation
      coordinates such as bounding boxes should not be changed)
code: def apply_image(self, img):
      return self.op(img)
  
imports: import numpy
  import torch
  import torch.nn.functional
  from fvcore.transforms.transform import CropTransform, HFlipTransform, NoOpTransform, Transform, TransformList
  from PIL import Image
label_desc: Use image node_id 2 for calling the ColorTransform obj's underlying member method code with example usage: obj.apply_image(img) and returns: self