The Windows Picture and Fax Viewer has a little plus and minus at the bottom of the picture to zoom. With Irfanview the picture is larger and you use the plus and minus keys on the numerical keyboard to zoom.
If you are talking about the stuff they have on TV or in the movies where they have a small blurred face on a surveillance shot and the tech pushes a button and gets a studio portrait of Brad Pitt – it doesn’t exist even at the CIA.
If you take a small digital photo and blow it up you eventually see the pixels. No amount of sharpening or alteration can produce detail that isn’t there. You can smooth it out somewhat with an image editor, but that won’t bring more detail. If an image is blurred there is software that will take out some of the blur.
But a small photo with limited detail is just that. Blowing it up just makes it look worse. You can resample to a higher resolution and it won’t pixellate as soon, but the detail still isn’t there and it still looks fuzzy.
There are devonvolution programs. Focus Magic is probably the most popular. Newer versions of Photoshop have a sharpening algorithm that includes deconvolution. You have to choose whether the blur is caused by camera motion or out of focus. You usually do better messing with the blur radius rather than letting the program determine it automatically.
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