Iphone lowers resolution of saved photos?

Whenever I try to save an HD photo to my iPhone (especially when I'm looking for wallpapers) the quality of the photo is visibly in a lot lower resolution in the camera roll than it is from the source? I could save a photo that is visibly smooth and HD when I look at the source, but as soon as I look at it in the camera roll it is all pixelated. Does anyone know what causes this or how to fix it? (I save most of my pictures from tumblr, in case that is important)

Oh well, if you screenshot it then it will capture the photo in the resolution that your phone is. If the photo is like 1920x1080 and your phone is say 480x372 then it will be saved as 480x372 because that's how big the screen is

That has never happened to me, try checking to see if that's the case from other sources.

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