Noise is aberrant pixels that appear in your image files, not correctly representing the color or exposure of the scene. It consists of speckles of different colors, often visible in certain portions of an image.
Almost every image file contains some level of noise, even if not visible to the naked eye. Significant noise is visible or becomes noticeable with post-processing adjustments like zooming in to 400%.
Noise is typically introduced in long-exposure images or high ISO settings. Understanding these factors can help photographers prevent and address noise issues for better image quality.
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