A Queensland police officer allowed a topless woman to wear his hat then pretended to handcuff her.

Four Australian police officers had their pay cut over a photo scandal involving a topless woman outside a Brisbane bar.

According to a Queensland Civil and Administrative Tribunal decision last month, police were at the Fringe Bar on Ann Street in Fortitude Valley when the bizarre incident occurred on September 12, 2010.

Three uniformed male police entered the bar about 1am (local time) when a woman offered to show them her newly-acquired breast implants.

Constable Travis Garth agreed and went outside with the two officers, the woman and her friend.

"She twice pulled down her dress to her waist. She and her friend were laughing. Constable Garth allowed her to wear another officer's cap. He held out his handcuffs, pretending to handcuff her," the QCAT decision said.

"The other constable used his phone to take a photo. The girlfriend took a photo."

Constable Garth was described as "the most culpable offender", with a previous QCAT ruling imposing a financial penalty of about $6000.

Three other officers who were fined launched appeals to have their penalties decreased.

Constable Liam Braunberger was the photographer. Sergeant Matthew Byles and Senior Constable Alec Swenson were not directly involved, but were reprimanded for not reporting the misconduct.

Sergeant Byles was the officer in charge of the team at the Fringe Bar, but was not present when the photo incident occurred.

While he told Constable Garth to delete the pictures, he was present when the officer started showing them to others in a police vehicle.

"At no time did you comply with your obligation...to report the misconduct of your fellow police officers," the allegations against Sergeant Byles stated.

Senior Constable Swenson was reprimanded for not reporting an officer who was showing the pictures to others at the Indooroopilly Police Station.

QCAT Member Bridget Cullen reduced the penalties against Senior Constable Swenson and Constable Braunberger, docking them one pay point over nine months.

Sergeant Byles' penalty was also less severe, but he had his pay cut by two pay points for six months.