Compress Jpeg is a program that reduces the file size of an image without compromising the picture’s quality. It works by converting the image into a lossy format and discarding some of the original data. This technique is usually used to compress images that are displayed online, since larger files take longer to upload and may slow down a website. It is also helpful for those who have limited storage space on their computers.

In order to compress a picture, the Discrete Cosine Transform (DCT) algorithm is used to map pixel values into a sequence of numbers. This number sequence is then quantized, which means the occurrences of each coefficient are shortened to smaller numbers and replaced with zeroes. The resulting sequence is then encoded into a bit stream, which is then padded with empty bits to get to the desired file size.

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Once the bit stream is completed, the DCT matrix is inversed to reconstruct the image. The final step is to check the pixel values to ensure that they match the original. Some programs will perform stronger compression in areas of the picture that are not as noticeable, so the quality is not compromised too much.

There are several ways to compress a photo, but most of them require downloading and installing additional software on your computer. Some will work offline, but others will only work when you are online. If you are using the Internet to compress your images, the best option is to use a website that allows you to choose from multiple options that optimize the process for different types of files.