File Extension JPG

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JPG File Extension Description

The file extension .jpg is named after and developed by the Joint Photographic Experts Group.

JPG Compatible Programs

Image editing programs like Adobe Photoshop are used to create and view files with the .jpg file extension. Pre-existing files with the JPG file extension can be edited or further compressed with the program. Elements can be added to an existing file and it can be further compressed into a JPG file with a smaller size.

If .JPG files wont open on your computer then follow these steps:

1. Make sure you have one of the programs above installed. If you do and .JPG files still wont open then proceed to step two below.
2. Ensure Windows is set to open .JPG files with the appropriate program. The easiest way to do this is to download Filecure and then select the manage tab on the left. This feature is available free in the Filecure application.
3. If the problem persists then download Filecure if you haven't already, and Click the big green "Start Scan" Button. It takes about 30 seconds to scan your computer for all file extension associations. Once the scan is finished you will see if any problems are detected. If so then Click the Green "Fix Now" Button.
4. Try to open your .JPG File again, The problem should be fixed.

(If you still have issues with this file, please click the Ask a Question button at the top right corner of this page)

Brief Introduction to JPG File Type Creation

Files with the .jpg file extension use groups of small rectangles or pixels to create a bigger picture. JPG files can contain several colors and are often low in resolution and file size. Because of its file size, digital cameras to store photos often use this image file format. This is also one of the more common image file type for web publishing.

Files with the JPG file extension are created by digital image programs or via direct compression after a picture is taken. The reason for the low resolution in files with the .jpg file extension is the lossy compression and decompression process, which can cause a high loss in picture quality to lessen file size.

There are many steps in creating a file with a .jpg file extension. The colors in the image are first converted from RGB to YCbCr. Once converted, the colors of the image are transformed into 3 parts: luma which represents brightness, chroma color blue and chroma color red. The resolution of the chroma colors is reduced since bright colors like red and blue are seen easily.

The resulting image is then separated into 8x8 pixel blocks. Each unique data undergoes a discrete cosine transform, which is like a spatial frequency spectrum. Then the image is quantized, which means that the most frequent elements or colors receive a lower brightness than those, which are least frequent.

The result is compressed again using a type of Huffman encoding. The data is again decoded to create an actual image file.

• Properties:

• Common Path:
  N/A
• Associated Applications:
  Apple Preview, Windows Picture and Fax Viewer, Safari, Mozilla Firefox, Internet Explorer, The GNU Image Manipulation Program, Scribus, Skencil, Inkscape, Ipe, Karbon14, NodeBox, OpenOffice.org Draw, Sodipodi, Synfig, Tgif, Xara Xtreme for Linux, Xfig, Z

Additional JPG File Info:

Joint Photographic Experts Group , JPG File Created by: www.jpeg.org

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