Sure, I’m reusing the ones from PV forums. Not real world samples, but charts, also consider that they’ve all been stripped from any metadata (18 images).
https://drive.google.com/file/d/0Bxtrjp4jb-YsZzF2bUxYeVhfSUE/view?usp=sharing
Methodology, set enviroment covering lamps with red flammable cheap synthetic cloth, loud music, have at hand enough whiskey, ice-cream and belly dancers, if that’s not possible (living on an igloo) beer and old cat with strange disease will do. WHITE ROBE and thick glasses, live stream to YT 
From photoshop I exported the base png, not included (very big). Also within photoshop I dowscaled with c3c (micro-contrast + 1 sharpness) and exported with tinyJPG; c3c/c3c_plusSH and c3c_tiny samples. On the other hand I downscaled the pngs with Imagemagick convert “f" -resize 1400 "{f%.*}_magic.jpg” (magic samples) and compressed them with mozjpeg, settings above (moz samples), jpegoptim quality 84 (optim samples) and one of them - sorry but takes too long with guetzli guetzli --quality 84 input output Also tried github suggested parallel processing with multiple inputs, still too slow.
Put down the cat, END