You can select : download file instead of send to my email account before you click get file for offline use button , to solve this problem.
You can edit the content after you click the button, click submit button again , and file can be downloaded to your computer (just select file folder and save it directly.).
It is the same for all the simulations at this web site.
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For a small pin hole, the sharp image is formed(pinhole1.png).
For a larger hole, it is a combination of several small pin holde.Each pin hole will form a sharp image, but those images will overlap each other. The result is not as sharp as a small pin hole(pinhole2.png).
For a verr large hole, the image become similar to the shape of the hole ((pinhole3.png)).
