@Ashjuk,
Unless it is a state secret ... how on earth do you get your image file sizes so small?
I used Gimp and rescaled my original macOS screen capture pageedit.png file to 800 by 850 and downsampled it from 144 ppi to 72 ppi and saved it. It was 397kb (from the starting 1.3mb). I then compared it to your pageedit.png that you produced (literally the same width and height and ppi) and it was only 35kb - less than 1/10th my file size!.
How is that possible? Your file sizes are truly amazing and they still look great on the screen.
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