Explain how lossless compression relates to image file formats.
What will be an ideal response?
ANSWER: Lossless compression techniques reduce file size without removing data. When you uncompress a file that uses lossless compression, you restore all its information. GIF and Portable Network Graphics (PNG) file formats reduce file size with lossless compression, which saves file space by using mathematical formulas to represent data in a file. These formulas generally use one of two algorithms: Huffman or Lempel-Ziv-Welch (LZW) coding. Each algorithm uses a code to represent redundant bits of data. For example, if a graphics file contains a large red area, the algorithm can set 1 byte to red and set another byte to specify 200 red bytes instead of having to store 200 red bytes. Therefore, only 2 bytes are used.
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