from PIL import Image

im = Image.open('bulk.png', 'r')
pix_val = list(im.getdata())  #read pixel values

pix_val_flat = [x for sets in pix_val for x in sets]  #flatten the list
pix_val_flat = list(filter((0).__ne__, pix_val_flat)) #filter 0
text = ''.join(chr(i) for i in pix_val_flat)   #covert to ASCII
print(text)