JPEG (Joint Photographic Experts Group)

JPEG - Joint Photographic Experts Group. Invented in 90s of the XX century, today it is the most widely spread format for image storage and web publishing. It became so popular due to its balance between image quality and size compression. Typically, size of a photo may be reduced by 10-20 times without any visible image distortion. Thus, JPEG is a standard format for storing images today.

Online Image Converter supports all features designed by JPEG format developers. Online Image Converter can read and save the following modifications of JPEG format:

  • Baseline (grayscale, YCbCr, RGB, YCbCrK, CMYK) - it is the most widely spread modification of JPEG. Most images in the world are now stored as Baseline YCbCr JPEG.
  • Extended sequential (8, 12 bit) - this is a rare modification of JPEG. Usually 12 bit grayscale JPEG is used to store medical images produced by X-ray or microscope devices.
  • Progressive - used mostly in Internet to quickly display images "on the fly". Usually, a small part of transferred data is enough to display a rough version of the image.
  • Lossless - this JPEG modification is often used in medical images. 12 and 16 bit grayscale JPEG is one of standard output formats for various types of medical equipment.

We recommend that you should save your images into JPEG format. Photo collections, scanned color images or postcards can be well saved in Baseline JPEG format. If you plan to transfer your images over Internet, save them in Progressive JPEG format.

Use Quality parameter to choose optimal balance between visual quality of the image and resulting image size. The larger is the value of this parameter, the higher is the quality of the resulting image and its size.

You can generate thumbnails for JPEG files by changing the value of the corresponding flag. Thumbnails will be used for fast image preview in browsers and graphics viewers.

We do not recommend using JPEG for saving monochromatic images or images which consist of several colors, for example drafts or drawings. With such images, JPEG can produce undesirable distortions (so-called Gibbs effect). We recommend that you should save such images into GIF or PNG formats.

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