Why whenever you take a picture of a computer screen, you can see all the pixels?
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If you mean take a picture with a digital camera, then what you will see is the pixels that the camera sensor captured. How good those represent the pixels on the screen depends.
Think of it this way, your monitor displays a certain number of small squares. Based on the monitor’s resolution and how big the display is, each square is a certain size.
Now, it’s the same for the camera sensor, based on the sensor resolution and physical size of the camera’s field of view, the pixels will have a size different from those on the computer screen.
When you take a photo, what you’re doing is overlaying a grid of squares (the camera pixels) over another grid of squares (the screen’s pixels).
If the grid of squares from the camera is smaller than that of the screen, you won’t be able to capture every pixel from the display. That doesn’t mean the photo won’t look alright.
If the grid of squares from the camera is exactly the same as that of the screen and perfectly aligned, then you’d have a photo of the pixels that is 1 to 1. You’re still seeing the pixels captured by the camera sensor, but they are a faithful reproduction of the ones on the screen.
If the grid of squares of the camera is the same or larger, but not perfectly aligned, you won’t capture exactly the pixels of the display. In practice, it means you won’t perfectly capture each pixel (good luck overlapping the sensor and screen pixels perfectly), but since camera sensors have pretty good resolutions, it won’t matter and the photo will capture a good enough image of what is on the screen.
You could draw a grid of squares on a sheet of paper representing the pixel of the computer monitor and another on something transparent representing the pixels of the camera sensor. Overlay them and move the one representing the camera around, you’ll see first hand what the camera sensor would capture. You can draw more or less squares to see what happens with different resolutions for the camera or screen. Doing this with grids of 2 x 2, 3 x 3, and 4 x 4 is nought to visualize the concept.
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