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Coming from the other side of the SVG -VS Pixel question:
Most photographs have a discrete number of pixels. However, many modern cameras have a ridiculous number of pixels available. two things can trip you up, though:
Cheap programs, like Paint and such will automatically reduce the resolution of your image to reduce memory needs.
Or the photo may have been saved in a lower resolution.
Either way, you cannot get extra pixels back.
Scalable Vector Graphics, OTOH, are computer-drawn images which are saved as a set of lines, boxes, circles etc, . . . that have a mathematical relationship within the image rather than a fixed number of pixels. So, no matter how large you scale the circle, it will still be smooth. Lines will be the same since the slope is calculated for the scale.
This is why when looking to scale drawings, it's much better to look for proper SVG files since many people who are not aware will often save in a pixel format that looked fine on their monitor, but doesn't scale well.
If you are dealing with photos, the best you can do is just look for the largest resolution you can find and hope it has enough detail to scale as much as you want it to.
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