. >> reporter: it's a huge exhibition, and it features 398 pieces of art by the british artist david hockney-- the largest show in the history of san francisco's deyoung museum. hockney has painted or produced most of this art in the last decade using 14 different media including charcoal, oil, watercolor, cameras and ipads-- digital art that is a major feature of this show. among the most dramatic work here is the massacre and the problems of depiction-- a grizzly and intriguing watercolor that harks back to goya and picasso with the added twist of a hooded photographer apparently figuring out how to depict what he's seeing. that's been one of hockney's major preoccupations throughout his long career. in this show some work repeats techniques and themes he has used before. he has continued painting portraits, often of his friends and family-- long a favorite subject for him. he even did a series of uniformed museum security guards, which he whipped out a decade ago. but he has always been innovative in subject matter and technique. in the '60s he moved from england to los angeles, and began

of david's that started in the 70s and really has a real breaking point in the early torres pr david hockney toward the mid 70s was doing one painting after another this painting looking at masterpieces looking at the reconstructionist of masterpieces. positive she an important operate of 3 people one of them has gotten up to the painting actually. this sort of thing, you know, famously cecelia and perrycy the cat those paintings one after another there's two or three portraits and he could have gotten into the sort of thing for the rest of his life and his dealers would have been popular but he's got a problem with the voice of one point prospective. he's using photographs a good deal he'll take photographs but photographs enforce a vice like one point prospective and, in fact, he suddenly begins to find there's a distortion he makes a join eras and calls them the photograph is wrong you can take three or four photographs to get it right as he says photograph i didn't say okay. if you look at a si closed-caption's for a second. he continues to do this but he hits a wall with the picture san

. >> ifill: and spencer michels profiles david hockney, the prolific artist who continues to innovate using technology to advance his work. >> hockney, at 76, shows no signs of slowing down, and in

david created 150 new images on his ipad. the 76 year old hockneyedge and revolutionizing the art world. >> this is where hand art and digital technology come together. i have not seen othersoused. >> he would make sketches on his iphone and send them to an art director. so far value is unknown. and now on the larger and portable iowa pad, he issousing bright color asks bold strokes to create intricate poses and challenge the printing process. this drawing is 12 feet tall on six large panels. >> working on his ipad, he uses brushes, a fro down load and simple to use. put your paint brush and color and draw. it is quick and easy to erase. >> the virtual landscapes are delighting the art lovers. >> i think it is fantastic. >> thanks to the esteemed artist and exhibits like this, it is inspiring artist to forego the traditional canvass. >> it is a new medium and we'll so more artist using the ipad with a whole variety of apps and not just the brush to make their works of art and i think it is here to stay. >> this exhibit closes in late january, in san

hockney park. this is the signpost where the 3 roads subtract. people come up to see the famous tomato dumb he's done over and over again. earlier this year david had a series of mini strokes and indeed went to the hospital and he had indeed - by the way, he's 76 years old and the first time he went into a hospital in his life. while i was in the hospital first one that happened the first trip is that somebody started putting graffiti all over the tomato thank you. and the second trip somebody chopped it down. and david went into a two day dark dark depression. when i again suggested it has to his own identification but his close mortality with the stroke. when he did get out of bed he didn't 3 incredible drawings of the to the duengland. the guardian put above the fold on the front package front page news. david's drawings of the field trade. he was also by the way, doing other charge cool drawings and when somethings bad happens wherever there's an individual friend who dies he gets all friends together and does portraits it has to do with somebody who has died too important tray the life that remains. for example, he did this wonderful portr