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You're wrong. the image is 755x425 for everyone regardless of device since it's a forum post, and if the user manually opens the image, it will depend how their browser handles it, if it displays the image at it's full resolution and the end users display is sub-4k, then it will only display a portion of the image, if the browser resizes to fit then the image will be whatever resolution it was resized to, using the scaling method relative to the browser.

And the image itself is compressed, so even if it's 4k in resolution, the content contained in the image file isn't true 4k because the compression used is lossy to reduce filesize.

If the photo was uncompressed raw at 4k displayed on a 4k display then you've got a 4K presentation, and that would look a damn sight better than the effects of eveything mentioned above.

Also the clarity of an image is dependant upon the viewers vision, bad eyesight and requirement for glasses play a role and.. well basically the threads just not right.

PPI is less of an issue for larger displays because theyre designed to be viewed from a distance, high density displays such as phone and tablets, are as such because theyre designed to be used at much closer proximity.

Average distance from a TV varies from country to country, but is generally between 1.6 meters and 2.4 meters in use, where as the average view distance for handheld high PPI devices is 30cm, that's a huge difference.

Also the 720ppi at 4 inch thing isn't accurate because the human eye does not see in grids, additionally the format of the display effect the perceived complexity of the final image, standard grid layout versus hex layout, dot array and so on, the receptors in the eye are densly packed but randomly packed, thus 720ppi seen by the eye isnt the same as 720ppi on a display, the clarity of angles and resolve of edge details is much greater in reality than what a grid display can emulate, so even if the 720ppi matches the average maximum of a human eye, it's still much lower perceived resolution than the real world.

Last but not least theres the issue of focus, the human eye can focus on things at different depths to resolve further information, for example if you take a picture of a room then try to read the title of a book from that image, you'll likely struggle, but being sat in the same room and looking at the book it would be a hell of a lot clearer, even though the human eye can only perceive at a fixed ppi, it can resolve greater detail from the area around it because of that ability to change focal depth, in effect, adjusting the PPI of a specific focal point at the cost of PPI of the now unfocused area.

A display, even at the same "maximum" of the human eye cannot adjust to resolve detail in particular areas of an image, it can only display a fixed image with a fixed PPI.

Last edited by NATO - on 19 January 2018