The head of a Northern California high school was photographed naked in a locker room, before the surreptitiously snapped image was shared all over campus.

Parents and students alike at Clayton Valley Charter HS in Concord were outraged by the stunning invasion of privacy.

But some teens are also unhappy with heavy-handed efforts by school officials to punish kids who even saw the picture.

Clayton Valley’s Executive Director David Linze was at a local gym when a student photographed him in the locker room and shared images with schoolmates via social media, the blog Claycord.com first reported on Monday.

“CVCHS takes disciplinary issues seriously and we never comment publicly on any specific matter related to our students,” according to a school statement.

“We would encourage the media to respect the privacy of our students and to recognize that discipline is always confidential.”

Clayton Valley Charter HS is about 30 miles northeast of San Francisco, in the sprawling suburbs of Contra Costa County.

“Everybody understands that what happened was not OK, and we don’t condone that at all,” school senior Alissa Guevara told KNTV.

The student who took the picture was expelled – but students who were merely sent the photo or viewed it are also being grilled and punished, according to Guevara.

“They take people out of class and threaten them with suspension if they don’t relinquish their phones for complete searches, which is against the law,” Guevara said.

Another student told KPIX: “We’re just worried about our rights as students.

Student Jacob Aviola said nearly everyone on campus has seen the picture of Linze.

“Right around fourth period, everyone had it on their phone,” said Aviola, whose sister was suspended for five days for having the picture on her phone.

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