Film grain effect

[apostel338 (HP)]

Concerning the optical illusion. From a thread about the same topic a while ago.

Film grain suggestion

Strange. Tested a handfull of photos, couldn’t reproduce it. Is it inconsistend from photo to photo, or does it sometimes happen and sometimes not on one single photo? If there are photos where it always happens, can you share the raw + arp file like Alberto requested? What I recognized is, on photos with a certain amount of ISO noise it can look like if the grain got blurred when the grain overlays the ISO noise that of course gets blurred by the effect.

Film grain suggestion

This is indeed a possible explanation. The best way to test this is to use a synthetic, noise-free image, to make sure you are not falling into some “perceptual trap”, so to say…