JPEG (Joint Photographic Experts Group)


JPEG is a very popular image file format; its full form is “Joint Photographic Experts Group.” At the same time, it is commonly used to store photos by digital cameras because it supports 224 or 16,777,216 colors.

This format supports compression of many levels, making it ideal for web graphics. These 16 million possible colors are produced in a JPEG image, using 8 bits of each color (red, green, and blue) in the RGB color space.

It provides 28 or 256 values ​​for each of these three colors, which together allow 256 x 256 x 256 or 16,777,216 colors.

Three values ​​of 0 produce pure black, while three values ​​of 255 produce pure white.

These JPEG compression algorithms can easily reduce the file size by ten times that of a bitmap (BMP) image, almost without any degradation in quality.

The compression algorithm is lossy, which means some image quality is lost during the compression process.

This is why professional digital photographers often choose the raw format for capturing images to edit their photos in the highest quality possible. They typically export pictures to JPEG (.JPG) images when they share or publish them on the web.

In addition to image data, JPEG files include metadata that describes the contents of that file. This includes image dimensions, color space, and color profile information, along with EXIF ​​data.

These EXIF ​​data are often “stamped” into the image by a digital camera and include aperture setting, shutter speed, focal length, flash on / off, ISO number, and many other values.

Disadvantages of JPEG Format

JPEG format is very good for storing digital photos; it also has drawbacks.

For example, some issues arise from this lossy compression, such as “artifacts,” in which parts of the image appear to be noticeably blocky. This often happens when a high compression setting saves the image.

While the small image and such images have a lot of text, then GIF format is used in such a way as a better option. JPEG images also do not support transparency.

Thus JPEG format is a bad choice to save non-rectangular images, especially if they are published on web pages with different background colors.

In these cases, the PNG format, which supports transparent pixels, is ideal for this type of image.

NOTE: This Joint Photographic Experts Group, which is the JPEG image format, published their first JPEG specification in 1992.

Since then, this organization has developed various variations, including JPEG 2000 and JPEG XR. But standard JPEG format has been very popular to date.

File extensions: .JPG, .JPEG, .JFIF, .JPX, .JP2


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