What is Jpeg?

What Does Jpeg Mean

JPEG is the acronym for Joint Photographic Experts Group , a committee of specialists who devised a standard for encoding and compressing digital images . JPEG is also the name of the format that identifies this type of document and the extension of the files in question.

It can be said, therefore, that JPEG is a method of compressing images and also a file format. Most of today's cameras, for example, work with JPEG files .
The compression algorithm used by JPEG makes it possible to reduce the weight (size) of image files, while also reducing their quality. The compressed image is thus not identical to the original image.

The JPEG format allows you to define the degree of compression. The higher the compression, the higher the quality loss and the smaller the file size. Therefore, if the image is little compressed, the loss of quality will be limited, although the file size will continue to be large.
Many times there are confusion between JPEG and JPG . In this sense, we must say JPG is the format used in the Windows operating system and in PCs , which usually work with three-character extensions. But both notions allude to the same thing: to this method of compression of digital images.
Many images that we find on web pages are JPEGs . However, there are other formats that are also popular, such as PNG and GIF , each with its own characteristics. The choice of one or the other format will depend on the needs of the content.
In this sense, a tip that image and design experts extend is to try several formats before deciding on one, at least in a project very different from the ones we have done so far. Once we know the pros and cons of each one, we can develop a certain degree of intuition that allows us to know in advance which one is best for each type of job.
With respect to PNG, we can say that it is a graphic format that allows images to be compressed with an algorithm that does not generate any loss . Since the mid-90s, we have been able to save our graphic documents with this extension to ensure that the result is satisfactory. In addition to image quality and color depth, PNG gives us the ability to store transparent pixels, unlike JPEG.

The temptation to use PNG is very great once we find out about all this: what is the benefit of wasting time adjusting the size of the file when saving it if PNG offers us the best quality, in addition to the possibility of including transparencies? Well the answer is that both formats have been created with different goals in mind.
Although it is true that the compression chosen for a JPEG file considerably affects its quality, it is ideal to use it for very large images and photographs, while PNG was designed for documents that contain considerable spaces of a single color or with little chromatic variations and for its storage on the Internet. When preparing a file for printing on paper, PNG is not so useful, but JPEG is preferred, among others.
The algorithm used by JPEG to compress images is supported by two phenomena inherent to our vision : on the one hand, our eyes are considerably more sensitive to changes in luminance than to chrominance, that is, they perceive alterations in brightness more easily than those of color; on the other, changes in brightness are best noticed in parts of the image where there are few variations.

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