>>2449711 cont'd.>This should be closest to the artist's originally intended contrast.This is because the artwork uses digital half-tone patterns (think of
>>2449471 but at much higher resolution) so that your eyes - or browser image scaling algorithms - can perceive them as different tones of gray.
PNG works wonders here because geometric shapes and repeating patterns can be easily compressed.
JPG on the other hand ruins such patterns with its lossy compression - they lose their originally intended contrast to jpg noise.
Resizing down is even worse because it completely breaks the delicate pixel-scale patterns. That's why the contrast changed so much in
>>2444073I hope this little off-topic dip was educational for digital art aficionados and not too boring!