Compress Jpeg is an image file compression tool that uses lossy compression to shrink the MB size of your images. The resulting files have reduced quality but are still more manageable for e-mails, websites and other online applications. It is not recommended to use this tool for drawings or other types of graphics as it can cause visible artifacts.
The process is simple, a digital image is first transformed into a color space called YCbCr, then it is coded by a lossy compression system. The result is a smaller sized file that can be easily opened by most applications. The quality of the resulting image is slightly reduced from the original due to this compression, but most users would not be able to tell the difference between a compressed and uncompressed image.
The Art of Compression: Unlocking the Power of Compress JPEG for Efficient Image Handling
A compression ratio of 10:1 or more is possible. In the coding process, there is also the option to discard some of the Cb and Cr channel information to save even more space. This is done by using a lossy algorithm and can be adjusted according to user preferences.
Generally, most applications keep about half of the color information (in the case of photographs) or a quarter of the color information for video clips, but the exact percentage is up to each individual application. The other color information is then encoded using a run-length encoding.
This method is known as “lossy” because some information in the original image is lost in the encoding process. There is a “lossless” mode defined by the standard, but it is not widely used in products.