Does the retina somehow affect the size of elements?

Question

Monitors

If we upload an image with a resolution of 100*200 to a regular desktop, then for the retina the same image must be in a resolution of 200*400 (or even more). It turns out that if we load an image of 200 * 400 for the retina, it will be displayed as 100 * 200 (I mean the dimensions)?

Does the retina somehow affect the size? Or will a photo with a low resolution on the retina be of poor quality, and with a high one - good, and at the same time, no dimensions change?

Answer 1

If we upload an image with a resolution of 100*200 to a regular desktop, then for the retina the same image must be in a resolution of 200*400 (or even more). It turns out that if we load an image of 200 * 400 for the retina, it will be displayed as 100 * 200 (I mean the dimensions)?

Depends on operating system and viewer software. Usually the image is stretched and looks plus or minus the same everywhere. But, for example, on older Windows without scaling on a 4K display, everything will really look very small.

Or will a photo with a low resolution on the retina be of poor quality, and with a high one - good, and at the same time, no dimensions change?

Something like that. On high-resolution ("Retina") displays, you can see more details in high-quality photos. Low resolution photos will look equally bad on both types of displays.

Answer 2

It is necessary to distinguish between physical pixels and logical ones. Pixels output by a program and displayed by the OS, video card, or monitor. Well, scaling.
That is, if you display that picture 1: 1, then on the "retina" it will simply be smaller, like the rest. After all, the density of pixels is higher, and their size is smaller. Accordingly, the details can be smaller.