this post was submitted on 17 Jun 2023
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You Should Know
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So say you have a picture, and it’s made up of pixels, and you want to send that picture to someone but in order to do so, you have to make it smaller. You could send the most important bits and allow reconstruction on the receiver’s end, or you could some how make it smaller without changing the information. So if your picture is four blue pixels, followed by 3 red, and 2 yellow you could send the entire string like that, versus blue, blue, blue, blue, red, red, red, yellow, yellow. This would be lossless and are generally GIF, PNG, etc. JPEG is lossy compression, and it would be like telling your friend receiving the picture “I have a picture of a bird, here’s part of a beak, one wing, a tail, and one foot.” Your friend, being smart, can reconstruct the data that wasn’t sent (other wing and foot, body) because they have a good idea how the rest of the bird should look based on the parts they see. Lossy is better for smaller compression, but lossless is important if all the information needs to reach the receiver. Hope that helps.