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enter image description here

What app or photo effect is it to get the sparkling or twinkle effect that's circled?

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It's generally called a starburst. There are filters that attach to your lens that create this effect, software "filters" that add the effect automatically to highlights, and software image effects that let you place a starburst wherever you want. These were pretty clearly applied by hand -- there's no optical reason that the "1" would have a starburst around it.

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  • \$\begingroup\$ It's worth noting that when it's not applied in software, it can be achieved by a diffraction grating. \$\endgroup\$ Jan 30, 2017 at 6:05

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