The students and their parents launched the lawsuit against St Francis High School in Mountain View, California, after the image sparked outrage last year

They say the school offered them an ultimatum to leave or be expelled

The school says the teens left voluntarily in June after the 2014 image resurfaced

The selfie shows the three boys with a dark green mask on their face

In the suit, launched in Santa Clara County Superior Court in August, it is claimed that one boy suffered with acne and the mask was to help with that 

He had taken a pic with a white facemask a day prior to the green one, it adds 

The boys say: 'A photograph of this innocent event was plucked from obscurity and grossly mischaracterized during the height of nationwide social unrest' 

The school's president said: 'St. Francis High School is committed to creating an educational environment where all students feel safe, welcome, and included'