LetzAI brings together 200 years of visual techniques in a 504-effect atlas

LetzAI brings together 504 visual effects, from 19th-century photography to generative AI, in a historical and educational atlas available online.

From cyanotype to artificial intelligence-generated imagery, by way of Georges Méliès’ trick photography, Technicolor, cinema optical effects, or the earliest digital experiments, contemporary imagery inherits two centuries of visual inventions. The Luxembourg platform LetzAI has set out to bring them together in The History of Visual Effects, an interactive atlas that catalogs 504 effects, processes, and aesthetics from photography, cinema, graphic design, and digital culture. Each technique is placed in its historical context, explained through its operation, and accompanied by visual references, with the option to reuse certain descriptions as generation prompts. Two Centuries of Imagery, from Early Photographic Processes to AI

The atlas goes back to the 1820s, notably featuring Nicéphore Niépce’s heliography, the kaleidoscope, and the earliest optical illusion devices. Its journey then spans the emergence of the daguerreotype, the calotype, and the cyanotype, before addressing photographic superimposition processes, cinematic trick photography, printing techniques, analog video, and digital processing.

The catalog includes 321 historical entries spread across 21 decades, from the 1820s to the 2020s. It associates processes as diverse as Eadweard Muybridge’s chronophotography, solarization, rear projection, the dolly zoom, slit-scan, or bullet time. More recent techniques, such as datamoshing, neural style transfer, generative inpainting, and image-to-video conversion, extend this timeline to contemporary practices.

The classification does not claim to fix a definitive invention date for each effect. LetzAI notes that a decade can correspond to the emergence of a process, a decisive breakthrough, or its dissemination to a broader public. This distinction notably allows popular aesthetics to be placed within a technical history that sometimes far predates their commercial or artistic exploitation. Understanding How an Image Is Made

The atlas is not limited to showing visual results. It seeks to explain why an image takes on a particular appearance. A glowing border, a distortion, an impression of depth, or a motion blur can stem from optical phenomena, chemical reactions, photographic processes, mechanical devices, or vastly different computer computations.

The entries establish these distinctions by associating the name of the process with its visible characteristics and its production mechanism. Cyanotype, for example, relies on a photosensitive printing process based on iron compounds, whereas a digital cyanotype simulation reproduces certain chromatic characteristics without using this chemical process. Similarly, datamoshing exploits motion and compression information from a video sequence, whereas a simple glitch filter merely imitates some of its visual cues.

This approach is of particular interest in the era of generative imagery. Terms like cinematic, vintage, or analog film look have become common in prompts, without always referring to a specific technique. By providing access to historical names, mechanisms, and corresponding references, the atlas allows for a more precise description of the desired visual qualities.

The entries also draw on works and resources from institutions such as the Metropolitan Museum of Art, the Museum of Modern Art, the British Film Institute, the Cinémathèque française, or the American Society of Cinematographers. The sources section brings together 77 institutions and documentary fields, while the effect pages detail the attributions and rights associated with the images used. A Second Catalog Dedicated to Machine-Produced Images

In addition to the 321 historical processes, there are 183 computer- and artificial intelligence-related effects, organized in a separate atlas dedicated to the digital image. This second part departs from chronological classification in favor of eight technical families, covering edge detection, masks, color, print textures, video artifacts, and generative operations.

It features methods such as Canny and Sobel edge detectors, image segmentation, depth maps, colorimetric transformations, or dithering algorithms. The atlas also incorporates tools that have become familiar in generative workflows, including ControlNet, LoRA adapters, latent space interpolation, image outpainting, and super-resolution.

This organization makes it possible to distinguish several categories often grouped together under the general term "visual effect." Some techniques serve to analyze an image or extract information, like depth maps and segmentation masks. Others directly modify its appearance, while generative methods produce new content from existing information or text instructions.

For creatives using image or video models, these differences can guide the choice of a working method. Achieving a specific composition, modifying a texture, reproducing a film look, or controlling the structure of a scene does not necessarily involve the same tools. From Historical References to Creative Exercises

LetzAI accompanies its catalog with 18 educational lessons devoted to light, perspective, movement, color, cinematic tricks, and computer-generated imagery. The exercises invite users to compare several processes, identify their technical principles, and apply them in creative situations.

One lesson, for instance, compares long exposure, chronophotography, and bullet time to demonstrate three different ways of representing time. Another brings together solarization, RGB channel splitting, and datamoshing—three effects that can produce visually altered images, but whose technical origins have almost nothing in common.

The learning journey also leads to art direction exercises. To conceptualize a twenty-second music teaser, the reader is invited to choose three effects from different decades, understand their historical context, and define their role in the visual narrative. It is therefore not merely a matter of accumulating spectacular treatments, but of