def decode_jpeg(encoded,
tables=b'',
photometric=None,
ycbcr_subsampling=None,
ycbcr_positioning=None):
''' ycbcr resampling is missing in both tifffile and PIL '''
from StringIO import StringIO
from PIL import JpegImagePlugin
return JpegImagePlugin.JpegImageFile(StringIO(tables +
encoded)).tobytes()
def read_q_table(file_name):
jpg = JpegImagePlugin.JpegImageFile(file_name)
qtable = JpegImagePlugin.convert_dict_qtables(jpg.quantization)
Y_qtable = qtable[0]
Y_qtable_2d = np.zeros((8, 8))
qtable_idx = 0
for i in range(0, 8):
for j in range(0, 8):
Y_qtable_2d[i, j] = Y_qtable[qtable_idx]
qtable_idx = qtable_idx + 1
return Y_qtable_2d
def jpeg_image():
return JpegImagePlugin.JpegImageFile(create_test_image('jpeg'))
