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Digital photos are computer files. Are stored either on the camera memory or on a computer hard drive. Like any other computer file digital photos are saved in well known formats. One of these standard formats is known as JPEG. Here are some useful information on JPEG files. Digital photo files are at their core a set of bits and bytes. A file format is a description of how these bits and bytes are ordered. Using standard file formats allows a device like a digital camera to save a file that can be further processed by another device, such as a personal computer running a software digital photo viewer.

The JPEG is a format that allows the storage of digital photos in a compressed format. This format saves storage space, allows for faster transmission of files over the Internet and also to improve performance when viewing photos.JPEG stands for Joint Photographic Experts Group. The original goal JPEG file format is to allow the compression and storage of digital photos of high quality. The JPEG file format has been successful and has been widely used. Later became an official ISO standard. JPEG files are also known as JPG file named after the common extension of the three letter file.

JPEG files are the de-facto standard for storing digital photos and are used by nearly all digital cameras and computer files software.JPEG store digital pictures in a compressed format. There are two types of compression algorithms: lossy and lossless data. Lossless compression means that when you open a compressed file data drawn exactly the same as the original. Lossless compression is used for example to compress large files.

Lossy compression on the other hand it means that the extracted data is a bit 'different from the original. At first glance it seems that the loss of data typical of compression algorithms with data loss is a problem. But for some data such as digital photos that loss can be considered negligible. The advantage of compression is lossy compression ratios much higher. Using lossless, Pentax Digital Camera, algorithms with digital photos is limited and provides very poor compression ratios.

Algorithms with loss on the other hand provide a compression ratio much higher, while the quality degradation due to data loss is minimal and in many cases it is not clear. JPEG files support both lossless and lossy compression algorithms but since lossless compression is inefficient for digital photos is sparsely used. In most cases JPEG files use lossy compression to efficiently compress digital photos.An example may help to explain why the high compression ratios are so important, even on the expense of a slight degradation of quality.

Photo of digital files are arrays of pixels. Each pixel has a value that represents its color and intensity and usually is 3 bytes long. A digital photo taken with an 8 mega pixel digital camera has 8,000,000 pixels and the size of the corresponding image file would be 8,000,000 * 3 = 24,000,000 or 24Mbytes. 24Mbytes is a very large file. Large files are difficult to manipulate take long to send via e-mail, which occupy the storage of large size and load time. If JPEG is used to compress and store digital photos the same result would be a typical file size of around 3Mbytes.

The quality of JPEG photos will be lower than the original, but the difference would not be visible to the viewer.