File format is irrelevant as I changed its format to PNG ,JPEG ,WebP.
Jpeg format of the dotted image:
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https://en.m.wikipedia.org/wiki/Halftone – Máté Juhász Mar 17 '19 at 15:18
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Are you referring to the tiny pixel dots (halftone), or the large spots (moiré pattern)? – u1686_grawity Mar 17 '19 at 16:50
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This is a halftone image, commonly used in newsprint.
The dots are removed by the smoothing algorithm when pixels are merged as the resolution is reduced when zooming out.
AFH
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Where continuous tone imagery contains an infinite range of colors or greys, the halftone process reduces visual reproductions to an image that is printed with only one color of ink, in dots of differing size (pulse-width modulation) or spacing (frequency modulation). This reproduction relies on a basic optical illusion: the tiny halftone dots are blended into smooth tones by the human eye.
Máté Juhász
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