Why in many galleries present the grid on the background?

it has long been noticed that many galleries, especially full screen in the background of the picture there is some sort of a grid of round dots with different radius top and bottom less, to the center of the screen bigger (like the emulation of the gradient). when scrolling pictures of the mesh remains stationary, its more noticeable on light areas.
what is it?
artistic idea? problem with graphics card/directX/even what some software components?
maybe the browser protection from the full sized images below for example it was impossible Desk "draw"?
in all browsers that I tried (IE9, Opera, chrome, FF) effect is present.
on other computers like the same picture.
for example, here here is possible to look
tried to Google, but such issues are not found, and terribly interesting, why so
October 8th 19 at 00:53
4 answers
October 8th 19 at 00:55
Resolution varies greatly, and if the server gives only 1 picture of a certain size is a simple way to hide the flaws of a small picture at high resolution to read the screen. For example at home I have a monitor with a resolution of 1024x768 and 1920x1080, take something let it be 1440h900 stacked over a layer with points, but if now I will watch this picture with the work it will increase by 60% and to hide the artifacts of such increase, make a layer with points.
Yes, it's most probable goal. perhaps it is. - Izabell commented on October 8th 19 at 00:58
October 8th 19 at 00:57
In the gallery shown in the example grid is superimposed over the picture browser ( div[class=fp_overlay] ).
While the picture itself is clean.
Copy protection nesharim? Rather, the authors believe that gallery so beautiful.
hmm, well the layers I didn't think to look, thanks for the valuable remark. but why? except without all the picture looks worse? I do not understand ) - Izabell commented on October 8th 19 at 01:00
October 8th 19 at 00:59
It seems banal protection of pantyavina copy pictures.
October 8th 19 at 01:01
Most likely the author's idea. Presumably mow a bitmap printing a La Roy Lichtenstein.

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