What's the point of upscaling?

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SpeedyNeo Contributing Member • Posts: 548
What's the point of upscaling?

In Fuji's X100 series, digital zoom causes the image to be cropped to a FOV similar to 50mm or 75mm equivalent.

Until here, there's no problem with me.

But when the image is taken, my understanding is the camera would 'upscale' the cropped image to the sensor's native resolution (24 or 26MP) before saving it.

Upon pixel peeping, one certainly would not expect the cropped image to be of similar quality to images taken through a 50mm or 75mm-equivalent lens, as there's no magic here. It's basically a slightly 'zoomed in' photo, i.e. of lower resolution.

So here I am just wondering:

1. What's the point of upscaling? (In other words: what would happen if Fuji just leaves the image at say 12 or 6 MP resolution?)

2. How's the upscaling done? (Does the camera make up new pixels around tbe current ones? Does it make the current pixels look bigger? Or what?)

Sorry for not being able to get my head around these 2 issues!

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