Every time you send a photo on WhatsApp, watch a video on YouTube, or scroll Instagram, you are using a technology created nearly 50 years ago by an Indian-origin scientist. His name is Nasir Ahmed and his simple idea quietly changed the digital world forever. From Bengaluru to the World Nasir Ahmed was born in 1940 in Bangalore (now Bengaluru). As a child, he was inspired by his grandfather, an electrical engineer who had worked in the United States. He completed his electrical engineering degree from the University of Visvesvaraya College of Engineering in 1961 and later moved to the US for higher studies. Over time, he became a professor at the University of New Mexico, where his most important work took shape. A big problem in the 1970s In the early days of computers, storing or sending digital images was extremely difficult. Even one high-quality photo created a very large file. With slow internet and limited storage, sharing images was expensive and time-consuming. Something had to change. In 1974, Ahmed and his colleagues T. Natarajan and K. R. Rao introduced a clever solution called the Discrete Cosine Transform (DCT). The simple idea that changed everything DCT is a mathematical method that breaks image data into wave-like patterns. This allows computers to remove details the human eye barely notices, making files much smaller without reducing visible quality. Surprisingly, many experts first thought the idea was “too simple.” But Ahmed and his team proved its strength using old punch-card computers. Their method dramatically reduced file sizes while keeping images clear. That “simple” idea became revolutionary. The hidden engine of the internet Today, DCT powers many technologies we use daily: Without this technology, sharing photos, streaming Netflix, or listening to Spotify would be much slower and consume far more data. In fact, sending even one image used to take minutes or longer before compression methods like DCT existed. Genius few people know about Despite shaping modern digital life, Nasir Ahmed remains largely unknown outside technical circles. Now a Professor Emeritus, he continues to be recognized for his lasting contribution from the United States. His story is a powerful reminder that one smart idea can change the world. So the next time you click a photo or stream a video instantly, remember the Bengaluru-born scientist whose mathematics made it possible.
