Storm Thorgerson, whose album cover artwork includes Pink Floyd's The Dark Side of the Moon, has died aged 69, the band's management has confirmed.
A childhood friend of the founding members of the band, he became their designer-in-chief, fashioning a string of eye-catching creations.
He designed the cover showing a prism spreading a spectrum of colour for The Dark Side Of The Moon.
His credits also include albums by Led Zeppelin, Peter Gabriel and Muse.
His family released a statement saying he died peacefully on Thursday surrounded by family and friends.
"He had been ill for some time with cancer though he had made a remarkable recovery from his stroke in 2003," it said.
"He is survived by his mother Vanji, his son Bill, his wife Barbie Antonis and her two children Adam and Georgia."
Pink Floyd guitarist and vocalist Dave Gilmour released a statement in which he said the artworks Thorgerson created for the band had been "an inseparable part of our work".
He said: "We first met in our early teens. We would gather at Sheep's Green, a spot by the river in Cambridge and Storm would always be there holding forth, making the most noise, bursting with ideas and enthusiasm. Nothing has ever really changed.
"He has been a constant force in my life, both at work and in private, a shoulder to cry on and a great friend. I will miss him."
A statement on the Pink Floyd.com official site said: "We are saddened by the news that long-time Pink Floyd graphic genius, friend and collaborator, Storm Thorgerson, has died.
"Our thoughts are with his family and many friends."
Thorgerson began his career with UK design group Hipgnosis, founded in the late 1960s and his distinctive style made him one of the industry's most recognisable artists.
There was the mournful-looking cow on the front of Atom Heart Mother, the burning businessman on the sleeve of Wish You Were Here, the giant pig flying over Battersea Power Station and the prism spreading a spectrum of colour across The Dark Side Of The Moon.
He told the BBC in 2009: "It's a nice but simple idea. Refracting light through a prism is a common feature in nature, as in a rainbow. I would like to claim it, but unfortunately it's not mine!"
The idea was sparked by Pink Floyd's keyboard player, the late Richard Wright, he explained.
"He said, somewhat provocatively, 'Let's not have one of your photos, we've had your photos before. Can't we have a change? A cool graphic - something smart, tidy, elegant.'"
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