[Image-SIG] Reading a 8bit Tif image from ArcMAP doesnt read well

[German Ocampo]

Good morning

Im reading an 8bit image generated by ArcMap using PIL in windows, the
image load well without error messages but, when I try to extract the
values to a numpy array I got some lines of the image with value of
pixel 127 (greyscale) or rgb(0,0,0). When I open the image using GIMP
or arcmap  I could see that the image is complete.

Any idea of what is happening??

the code that I'm using for read the image is:

     from PIL import Image
     from PIL import TiffImagePlugin
    import numpy as np
    import sys
    im = Image.open(file_tif)
    values=np.zeros((size_y,size_x))
    mode=im.mode
    temp=list(im.getdata())
    cont=-1
    list_colors=[]
    for i in range(0,size_y):
        for j in range(0,size_x):
            cont+=1
            if mode=="RGB":
                color=temp[cont]
                print cont,temp[cont]
                if color in list_colors:
                    index=list_colors.index(color)
                    values[i][j]=index+1
                else:
                    list_colors.append(color)
                    values[i][j]=len(list_colors)
            else:
                values[i][j]=temp[cont]

Best regards

German