este codigo no da un resultado de imagen con el canal alpha, está malo 
def resize(path, new_width_height = 1280, save_image = False, convert_RGB = True, clip_full_hd = False, quality = 100):
  '''
  Resize and return Given Image
  args:
    path: Image Path
    new_width_height = Reshaped image's width and height. # If integer is given, it'll keep the aspect ratio as it is by shrinking the Bigger dimension (width or height) to the max of new_width_height  and then shring the smaller dimension accordingly 
    save_image = Whether to save the image or not
    convert_RGB: Whether to Convert the RGBA image to RGB (by default backgroud is white)
  '''
  image = Image.open(path)
  w, h = image.size

  fixed_size = new_width_height if isinstance(new_width_height, int) else False

  if fixed_size:
    if h > w:
      fixed_height = fixed_size
      height_percent = (fixed_height / float(h))
      width_size = int((float(w) * float(height_percent)))
      image = image.resize((width_size, fixed_height), Image.NEAREST)

    else:
      fixed_width = fixed_size
      width_percent = (fixed_width / float(w))
      height_size = int((float(h) * float(width_percent)))
      image = image.resize((fixed_width, height_size), Image.NEAREST) # Try Image.ANTIALIAS inplace of Image.NEAREST

  else:
    image = image.resize(new_width_height)

  if image.mode == "RGBA" and convert_RGB:
     image.load() # required for png.split()
     new = Image.new("RGB", image.size, (255, 255, 255)) # White Background
     image = new.paste(image, mask=image.split()[3]) # 3 is the alpha channel
     #new.paste(image, (0, 0), image)
     new.paste(image, mask=alpha_channel) # Paste the image along with its alpha channel

      # new = Image.new("RGBA", image.size, "WHITE") # Create a white rgba background
      #new.paste(image, (0, 0), image) # Paste the image on the background.
  mage = new.convert('RGBA')

  if save_image:
    image.save(path, quality = quality)

  return image


class DummyFlags():
  def __init__(self, ckpt_path:str, task:str, input_dir: str = "./maxim/images/Enhancement", output_dir:str = "./maxim/images/Results", has_target:bool = False, save_images:bool = True, geometric_ensemble:bool = False):
    '''
    Builds the dummy flags which replicates the behaviour of Terminal CLI execution (same as ArgParse)
    args:
      ckpt_path: Saved Model CheckPoint: Find all the checkpoints for pre trained models at https://console.cloud.google.com/storage/browser/gresearch/maxim/ckpt/
      task: Task for which the model waas trained. Each task uses different Data and Checkpoints. Find the details of tasks and respective checkpoints details at: https://github.com/google-research/maxim#results-and-pre-trained-models
      input_dir: Input Directory. We do not need it here as we are directly passing one image at a time
      output_dir: Also not needed in out code
      has_target: Used to calculate PSNR and SSIM calculation. Not needed in our case
      save_images: Used in CLI command where images were saved in loop. Not needed in our case
      geometric_ensemble: Was used in training part and as it is just an Inference part, it is not needed

    '''
    self.ckpt_path = ckpt_path
    self.task = task
    self.input_dir = input_dir
    self.output_dir = output_dir
    self.has_target = has_target
    self.save_images = save_images
    self.geometric_ensemble = geometric_ensemble