Why does the old pictures we took using our old mobile phones looked kinda blurred when we view them now but looked pretty clear at the time we took it?
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When you take a picture using a phone camera or normal digital camera, the image snapped is made up of millions of little squares called pixels.
As technology advances on mobile cameras, it can fit more pixels in the image (i.e, the MP of the camera). Pixels make the ‘shapes’ in the image, so with horizonal and vertical lines, pixel density isn’t too important. It is important on diagonal lines though as it creates smoothness of the image to our eye.
If you had 10 squares diagonally into a set space, it would be apparent and jagged, whereas if you make those squares smaller, say to fit 100 squares rather than 10, the diagonal will appear smoother.
Then there is the viewing device. A better resolution (i.e., how many squares on the screen) can display an image with better clarification.
If you view an image of a lesser resolution on a higher resolution screen, in order to fit it on there, it attempts to ‘fill the gaps’.
For example, if it were a 1:1 ratio, it would be 1 pixel to 1 pixel. If that ratio is changed, say 2:1, then the screen needs to use 2 pixels for 1 pixel in the image, undoing some of that smoothness on the diagonal lines.
Try zooming into one of those grainy images next time and you can likely see the diagonal squares.
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