colors in a scene were significantly elevated in the presence of spatial variations along the same chromatic axis as the simulated chromaticity shift. In a variegated scene, correlations between spatially local chromatic signals across illuminants, and the desensitization caused by eye movements across spatial variations, help the visual system to attenuate the perceptual effects that are due to changes in illumination.Image copyright Reuters Image caption Brock Turner left the Santa Clara County jail early on Friday morning

A student at a top US university whose six-month jail sentence for sexually assaulting an unconscious woman in 2015 was widely criticised for being too lenient has been released from prison.

Brock Turner, 21, who was a swimming champion, assaulted the woman outside a Stanford University fraternity house.

He was freed from the Santa Clara County Main Jail in San Jose, California, after serving three months.

Inmates in California typically serve 50% of their sentences before release.

Turner, who left the jail without commenting to journalists, apparently intends to return to Ohio to live with his parents.

Under the terms of his release, he faces three years of supervised probation and will be registered as a sex