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arrow_back Does the retina have any effect on the size of the elements?

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If we upload a 100*200 resolution image to a regular desktop, then the same image must be 200*400 (or even larger) for the retina. So if we upload a 200*400 image for retina, it will be displayed as 100*200 (I mean dimensions)?

Does a retina have any effect on the size? Or will a low-resolution photo on a retina be of poor quality, and a high-resolution one of good quality, with no change in size?

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retina is marketing.
Operate on concepts such as dpi, resolution

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If we upload a 100*200 resolution image to a regular desktop, then the same image must be 200*400 (or even larger) for the retina. So if we upload a 200*400 image for retina, it will be displayed as 100*200 (I mean dimensions)?
Depends on your operating system and viewing 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 look very small indeed.

Or will a low resolution photo on a retina be of poor quality and a high resolution photo of good quality, with no change in any dimensions?

Something like that. On high resolution ("Retina") displays, you can see more detail in quality photos. Low resolution photos will look equally bad on both types of displays.
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You should distinguish between physical pixels and logical pixels. Pixels output by the program and displayed by the OS, video card or monitor. And scaling.
That is, if you output that 1:1 picture, it will simply be smaller on the retina, just like the rest. After all, the pixel density is higher, and their size is smaller. Accordingly, the details may be smaller.