import sys
import numpy as np
from PIL import Image
from tifffile import imread

image = imread("/dev/stdin")
ma = np.max(image)
mi = np.min(image)
print(image.dtype, image.shape, mi, ma, np.median(image), file=sys.stderr)

im = None

if sys.argv[1] == 'scaled':
  im = np.clip(image // (image.shape[0] * image.shape[1]), 0, 255)
elif sys.argv[1] == 'normal':
  im = (image-mi) * 255 // (ma-mi)
elif sys.argv[1] == 'center':
  im = image * 127 // (ma-mi) + 127
elif sys.argv[1] == 'log2abs':
  im = np.log2(np.abs(image)+1) * 256 / np.log2(max(ma,-mi)+1)
elif sys.argv[1] == 'log2bi':
  im  = (np.log2(np.clip(image+1,1,np.inf)) * 127 / (max(np.log2(ma),1)+1))
  im -= (np.log2(np.clip(-image+1,1,np.inf)) * 127 / (max(np.log2(-mi),1)+1))
  im += 127
else:
  raise Exception("Usage: showtiff.py scaled/normal/center/log2abs/log2bi")

if len(sys.argv) == 3 and sys.argv[2] == 'save':
  Image.fromarray(np.asarray(im, dtype='uint8')).save("/dev/stdout", format="png")
else:
  Image.fromarray(np.asarray(im, dtype='uint8')).show()