In Japan, the concept of indexicality in photojournalism has a rich history. It emerged during an era when photographs were often subject to technical adjustments and corrections for various reasons. Even then, readers had already begun viewing these images as the result of light interacting with the subject despite the initial photographic process and subsequent modifications.
During wartime propaganda, photographs were frequently altered for different purposes, yet readers’ attitudes remained consistent, allowing the indexical function to persist. After World War II, photojournalism using film cameras demonstrated remarkable indexical stability for about half a century. However, as we entered the 1990s, advancements in digital technologies-such as image manipulation techniques and the digitization of data for capture, transmission, and storage-gradually transformed the definition of a photograph. No longer could we strictly define a photograph as an image created solely by light from the subject.
Amidst this increased plasticity (the potential for modification), news organizations have strived to maintain the perception of photojournalistic images as indices by adhering to ethical guidelines that discourage digital manipulation of digital photographs. However, the landscape has evolved further. Smartphones equipped with computational photography capabilities generate images that resemble past high-quality photographs, even though they are distinct from photorealistic images produced by AI. Additionally, recent high-end digital cameras now incorporate features to prove the authenticity of captured images, recording metadata to ensure transparency regarding any image alterations.
Based on the authority of existing media and the trust bestowed by readers, the method of maintaining the "indexicality" of journalistic photographs through self-restraint in image manipulation is no longer the sole approach in this complex media environment.
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