[Image-SIG] Example Code for Displaying Pictures--I'm Stumped

[Wayne Watson]

Thanks. Unfortunately, the fellow that can answer my question left early
yesterday, so I won't know exactly the file's structure until Monday.

Christopher Barker wrote:
> Wayne Watson wrote:
>> I didn't know I could post, attach I guess, here. I'll do that later.
>
>  as long as it's a small file -- it can be much easier to help
>
>> There is one puzzling format difficulty I have with the file that 
>> requires some attention. I hope to have that cleared up in the next 
>> hour or two. Actually, there's a twist in the format that should be 
>> mentioned. The first image (frame) is 640x480, and I'm pretty sure 
>> one byte per pixel. However, every other image (frame) after that is 
>> 128 pixels square. An auxiliary text file provides where, x and y 
>> pixel position, the small image should be pasted to form a complete 
>> image with the 640x480 frame.
>
> Maybe it's because I"m more familiar with numpy than PIL, but this is 
> how I'd do that (untested, of course...):
>
> import numpy as np
>
> infile = file('filename')
>
> img = np.fromfile(infile, count=640*480, dtype=np.uint8)
>
>
> for i in range(num_images):
>     do_something
>     small_image = np.fromfile(infile, count=128*128, dtype=np.uint8)
>     img[x:x+128, y:y+128] = small_image
>     ....
>
> NOTE: np.histogram2d might do what you want for the histogram
>
>
> I'm sure you can do somethign similar directly with PIL.
>
> -Chris
>
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           Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

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