Edited by dankay, 13 September 2017 - 01:26 AM.
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If by "digital footprint" you mean "metadata", most image files contain information (metadata) about the picture. Metadata provides information about a picture's pedigree, such as the type of camera used, color space information, location, timestamp, application notes, etc.
Different picture formats include different types of metadata. Some formats, like BMP, PPM, and PBM contain very little information beyond the image dimensions and color space. In contrast, a JPEG from a camera usually contains a wide variety of information, including the camera's make and model, focal and aperture information, and timestamps.
PNG files typically contain very little information, unless the image was converted from a JPEG or edited with Photoshop. Converted PNG files may include metadata from the source file format. Many image converters remove metadata.
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