Definition: Stair-like lines that appear where there should be smooth straight lines or curves. Jaggies can occur for a variety of reasons, the most common being that the output device (display monitor or printer) does not have enough resolution to portray a smooth line. In addition, jaggies often occur when a bit-mapped image is converted to a different resolution. This is one of the advantages vector graphics has over bit-mapped graphics -- the output looks the same regardless of the resolution of the output device. The effect of jaggies can be reduced somewhat by a graphics technique known as antialiasing. Antialiasing smoothes out jagged lines by surrounding the jaggies with shaded pixels. In addition, some printers can reduce jaggies with a technique known as smoothing. The smaller the pixels and the greater their number, the less apparent the "jaggies". Also known as pixelization.
About Me
Showing posts with label J. Show all posts
Showing posts with label J. Show all posts
Thursday, March 20, 2008
JAVA
Definition: A programming language developed by SUN. Among other features, it allows the programming of interactive software for the Internet.
JAVASCRIPT
Definition: A scripting language, developed by Netscape® Communications. Javascript is the language that allows the images on the top of this page to hi-light as you roll your cursor over them. Javascript code can be placed directly onto web pages.
JCII
Definition: Japan Camera Inspection and Testing Institute. It is an organization in Japan to monitor export quality of Japanese made cameras.
JOULE
Definition: unit used to quantify the light output of electronic flash. A joule is equal to one watt second of 40 lumen-seconds. The measure is used to compare flash units in terms of power output.
JPEG
Definition: Joint Photographic Experts Group. This group established a standard method for compressing and decompressing digitized photos or images. The high-resolution images provided with PhotoDisc are compressed according to JPEG standards.
Definition: A standard for compressing image data developed by the Joint Photographic Experts Group, hence the name JPEG. Strictly speaking, JPEG is not a file format, it's a compression method that is used within a file format, such as the EXIF-JPEG format common to digital cameras. It is referred to as a lossy format, which means some quality is lost in achieving JPEG's high compression rates. Usually, if a high-quality, low-compression JPEG setting is chosen on a digital camera, the loss of quality is not detectable to the eye.
Definition: JointPhotographicExperts Group (the committee that established the baseline algorithms), . jpg. . A JPEG is a graphic image file created by choosing from a range of compression qualities (actually, from one of a suite of compression algorithms). When you create a JPEG or convert an image from another format to a JPEG, you are asked to specify the quality of image you want. Since the highest quality results in the largest file, you can make a trade-off between image quality and file size. There are several versions of JPEG, some proprietary. JPEG analyses images in blocks of 8 X 8 pixels in size, and selectively reduces detail within each block. At higher compression ratios, the block pattern becomes more visible and there may be noticeable loss of detail. The actual effect depends on the size of the image when output on a monitor or printer and on the type of subject. This is why you can get as many images into the digital cameras. The results in decompression of the files can cause "blockiness," the “jaggies," or " pixelization " in some digital images. The higher the compression ratio the more the pixelization or "blockiness" occurs. The greater the pixel count, the less pixelization may occur.
Definition: format for compressed graphics files. JPEG graphics are commonly used as part of World Wide Web.
Definition: A standard for compressing image data developed by the Joint Photographic Experts Group, hence the name JPEG. Strictly speaking, JPEG is not a file format, it's a compression method that is used within a file format, such as the EXIF-JPEG format common to digital cameras. It is referred to as a lossy format, which means some quality is lost in achieving JPEG's high compression rates. Usually, if a high-quality, low-compression JPEG setting is chosen on a digital camera, the loss of quality is not detectable to the eye.
Definition: JointPhotographicExperts Group (the committee that established the baseline algorithms), . jpg. . A JPEG is a graphic image file created by choosing from a range of compression qualities (actually, from one of a suite of compression algorithms). When you create a JPEG or convert an image from another format to a JPEG, you are asked to specify the quality of image you want. Since the highest quality results in the largest file, you can make a trade-off between image quality and file size. There are several versions of JPEG, some proprietary. JPEG analyses images in blocks of 8 X 8 pixels in size, and selectively reduces detail within each block. At higher compression ratios, the block pattern becomes more visible and there may be noticeable loss of detail. The actual effect depends on the size of the image when output on a monitor or printer and on the type of subject. This is why you can get as many images into the digital cameras. The results in decompression of the files can cause "blockiness," the “jaggies," or " pixelization " in some digital images. The higher the compression ratio the more the pixelization or "blockiness" occurs. The greater the pixel count, the less pixelization may occur.
Definition: format for compressed graphics files. JPEG graphics are commonly used as part of World Wide Web.
JPEG (JOINT PHOTOGRAPHIC EXPERTS GROUP)
Definition: A graphics file format designed for use with photographs and other color bitmaps. The JPEG format uses compression algorithms and an "averaging" technique to create files that are smaller than would be the case with other graphics file formats. Saving an image as a JPEG files does cause a very minor loss of image data and in some cases, quality.
JPEG COMPRESSION
Definition: A standard developed by JPEG for reduction in the amount of data required to represent an image and therefore the hard disk space needed to store it. The techniques involved in compression may result in loss of actual data, which may result in irregular rasterization of an image or granularity. JPEG compression is defined only for still-image compression, although a number of variants referred to as "motion JPEG" are used in digital videography.
JPEG2000
Definition: The new JPEG compression standard that will be used in digital cameras and software starting in 2001. It will feature higher compression but will less image quality loss.
JUKEBOX
Definition: A storage device for multiple optical disc, and one or more discs drives. It will automatically select or changeover as needed. Also Kodak's term for Photo CD's automated disc library.
JUXTAPOSE
Definition: In composition, to place two objects close together or side by side for comparison or contrast. Often helpful in showing scale in an image.
Subscribe to:
Posts (Atom)