The image is divided into small blocks (usually 8x8 pixels), and the mathematical DCT is applied to represent these blocks as a sum of different frequencies.
, which can pinpoint the precise location of the image. The Universal Standard
A unique aspect of files like is the EXIF metadata they contain. This data acts as a digital birth certificate, often recording: The exact date and time the photo was taken.
, including the make, model, aperture, and ISO speed.
This is the primary "lossy" step where high-frequency information (fine detail) is reduced, significantly shrinking the file size. Metadata and Digital Footprints
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