COMPUTER NETWORKING

Detailed explanation-1: -Quantization Phase The second phase of JPEG is where the compression becomes lossy. DCT does not itself lose information; it just transforms the image into a form that makes it easier to know what information to remove.

Detailed explanation-2: -In the third stage, each block of DCT coefficients is subjected to a process of quantization, wherein grayscale and color information are discarded. Each cosine transform coefficient is divided by its corresponding element in a scaled quantization matrix, and the resulting numerical value is rounded.

Detailed explanation-3: -JPEG compression attempts to create patterns in the color values in order to reduce the amount of data that needs to be recorded, thereby reducing the file size. In order to create these patterns, some color values are approximated to match those of nearby pixels.