Resolution testonline

NOTE: If you got a PenTile display, usually the green will do fine! Have a look at this on different subpixel arrangements. Several pixel arrangement exists out there, that could have similar issues…

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What is my screenresolutionAndroid

So due to bleeding on many displays, you can expect to find a slightly finer resolution looking at the vertical ‘line-pair’ compared to the horizontal one.

So a display is really not perfect for this test, as the bleeding is smoothing slightly. A phenomena, that is usually a good thing when watching the display, as it helps making combinations of R+G+B to appear as one colour. So actually your eyes might be slightly better than what the test above shows.

What is ‘needed’ is a very subjective thing balancing such thing as price and (for battery-powered devices) stamina. But of course this can not be finer than the physical limit. Our eyes/brains are really great at smoothing out things, especially with moving pictures. That is why we were quite happy with pre-HD televisions…

1920x1080resolution test

The bleeding is most apparent looking at the edge of the white area to the right where the red pixels are more pink inside the white area (green and blue neighbours), and more orange where they only got a green neighbour. The difference must be the bleeding of the blue and green into the red. Here is a blow up:

Be SURE that your browser or your windows settings doesn’t do any scaling/zooming/smoothing, i.e. one pixel in the image is one pixel on the display. (If in doubt take a magnifying glass -or macro camera- and look closely on the screen, it should be like the mock-up later in this post)

Screenresolution test

Here are charts for a few other screen resolutions, that might make it easier to match your screen (sorry WordPress warps the table oddly on smaller displays)

Resolution TestChrome extension

The coarsest 1/7000 matches 0.5 arc minute, slightly finer than the 0.6′ claimed here:  http://www.wired.com…one-4-retina-2/

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4Kresolution test

Please note, this is NOT a limit for what is ‘needed’ on any types of device, but a limit for what it would be pointless to go beyond.

To my surprise I found that my eyes could see substantially finer details than simpler tests done previously. EDIT 20190824: Just got new glasses, and redid the test, and found around 1/11400 (my original 1/7000 was due to wrong glasses, as I no longer can focus at ‘any’ distance with the same correction).

What is my screenresolution

Though not as fine as down to the  0,35′ mentioned here:  http://www.cultofmac…enough-feature/ The 0.35′ is about 1/10000 of the viewing distance.

Note that bleeding is almost non existent on this monitor, with clear black areas between the subpixels, and it can also easily be seen how red is the deepest, followed by green and blue on top (the further from perpendicular we are observing the more the deeper pixels seems like creeping under the neighbouring higher up pixel).

Also note, that you MUST be able to focus at the relevant distances to use this test. If you got focus issues, you might need to swap glasses, or find a monitor with a DPI displaying the limit at a distance you actually can focus. E.g a modern smartphone that typically got a high DPI (if amoled, check if it is regular matrix or PENTILE..).

It is the point where the single line pair is indistinguishable from the double line we are looking for (that is: where it looks like one continuous thick line)

Next a cut from the test image on a white background, and a macro shot of this on a Samsung 275T+ (Unfortunately F900exr only, hadn’t got the CX3 at hand that day) That looks like this    (click to enlarge)

Resolution testfree

Just the original and some extra red guide-lines, to match the resolutions corners, to assure 100% zoom. (on larger resolutions just replicated to fill the screen with something)

Be SURE it is shown in the screens native resolution. e.g. 960 pixels should fill half a FullHD display. (or use one of the added ones with your screens resolution)

The feedback I have had so far range from around 1/7000 over the most common around 1/12000 of the viewing distance to two eagle eyed guys around 1/26000(!)