A greyscale (grayscale) image is an image in which each pixel carries intensity information (brightness) only, with no color (chrominance) information. Essentially, it’s composed of shades of gray, ranging from black (0 intensity) to white (maximum intensity). In an 8-bit grayscale image, each pixel is represented by a value from 0 to 255 indicating its lightness. Many computer vision algorithms, especially older ones, often start by converting images to grayscale to simplify processing since it reduces data from three channels (RGB) to one while preserving essential structural information. Humans perceive color, but for tasks like edge detection or object recognition, color may be secondary to intensity patterns. Greyscale images are also common in certain sensors (like depth cameras or certain medical imaging modalities). Converting to grayscale typically uses a weighted sum of the R, G, B values (like 0.299R + 0.587G + 0.114B, which reflects human brightness perception).
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