The compression method is usually lossy compression, meaning that some visual quality is lost in the process and cannot be restored. There are variations on the standard baseline JPEG (insert word) image that are lossless, however these are not yet widely supported. There is also an interlaced "Progressive JPEG" format, in which data is compressed in multiple passes of progressively higher detail. This is ideal for large images that will be displayed while downloading over a slow connection, allowing a reasonable preview after receiving only a portion of the data. However, progressive JPEG (insert word) image are not as widely supported.
By using ZoomInto.com’s browser based software you can upload your image to be able to zoom into and pan around the image. Free demo version is available at www.ZoomInto.com. For individuals and businesses that use web based digital photos, images and pictures for informational, entertainment and commercial purposes.
There are also many medical imaging systems that create and process 12-bit JPEG images. The 12-bit JPEG format has been part of the JPEG specification for some time, but again, this format is not as widely supported.
People that use the Internet may be familiar with the irregularities known as compression artifacts that appear in JPEG images. These are due to the quantization step of the JPEG algorithm. They are especially noticeable around eyes in pictures of faces. They can be reduced by choosing a lower level of compression; they may be eliminated by saving an image using a lossless file format, though for photographic images this will usually result in a larger file size. Compression artifacts make low-quality JPEGs unacceptable for storing heightmaps. The images created with ray-tracing programs have noticeable blocky shapes on the terrain. |
