AHI-TECH photo re-touching counter caught the attention of all visitors at the open day of the Lung Cheung Government Secondary Technical School. The stall, set up by the school's computer and photography clubs, drew laughter with its clever visual gimmicks, such as a picture of a classroom presided over by a teacher wearing the face of pop singer Vivian Chow. The special feature about the stall was that the photography club pictures had been processed by the computer club. Sixth-former Fu Ki-lok, who happens to be chairman of both clubs, was responsible for the joint effort. ''With double chairman duties, I realised it would be tricky to take care of two counters at the same time. So I thought of something that could be done both clubs together.'' The mathematics student is a computer buff, and spends most of his free time studying and toying with computers. Ki-lok said computers can be useful to almost all subjects and interest clubs. He explained how computers had helped the photography display. ''We could add or cut something, change colours, or print a 'new picture' that looked like the real one,'' he said. As with the photo technology stall, all the other displays had something to catch the eye. There were 30 counters, impressively mounted with over 50 display boards, covering the activities of groups like the art, bridge, chess and drama clubs, the English society and the design and technology class. Current affairs, including a presentation on the Sino-British joint declaration, were covered by the civic education team, and the social studies society explained the hazards of smoking. The science society had information on subjects ranging from AIDS to energy conversion. Outstanding student projects were also on display. These included technical drawings, delicate wood work and electronic inventions. Sixth-former Lee Chi-kuen, head of the student union, said the open day took the students two weeks to prepare. ''We hope our open day has shown the public that our school is just as good as any other, and that our students are talented and innovative,'' Chi-kuen said.