[Image-SIG] Can't seem to assign values to I;16 image

[Jason Rodriguez]

Hi,

I'm trying to perform pixel-assignment operations using the load() 
method in order to create 16-bit TIFF files.  From the documentation, it 
seems quite straight-forward using the internal I;16 image format, but 
for some reason, it seems that even a simple pixel assignment with this 
format fails.

For instance, I cannot get this to work:

 >>> import Image
 >>> test_image = Image.new('I;16', [300,300])
 >>> test_image_pix = test_image.load()
 >>> test_image_pix[3,3] = 5000
 >>> test_image_pix[3,3]
0
 >>>

As you can see, rather than pixel [3,3] being assigned a value of 5000, 
it still gets assigned a value of 0.  And this seems to happen with the 
putdata() method as well.  It also doesn't seem to matter what integer 
value I input, they all return 0 when I call them back.

For RGB, Float, 32-bit Integer, etc. formats, this method seems to work 
fine though.  For instance:

 >>> test_image2 = Image.new('RGB', [300,300])
 >>> test_image2_pix = test_image2.load()
 >>> test_image2_pix[3,3] = 40,40,40
 >>> test_image2_pix[3,3]
(40, 40, 40)
 >>>

Is there a bug I'm un-aware of for assigning pixel values to I;16 
formatted images?  Or is there a specific function I should apply to the 
integers being input into the I;16 format for them to be assigned properly?

If there is a bug, what is the work-around for creating a 16-bit TIFF?

Thanks,

Jason Rodriguez
Virginia Beach, VA