QUICKTIME
QuickTime (.mov) is a media container format. It functions as a multimedia container file that contains one or more tracks, each of which store a particular type of data, such as audio, video, effects, or text.
Each track contains track media, either the digitally-encoded media stream (using a specific codec such as Cinepak, Sorenson codec, MP3, JPEG, DivX, or PNG) or a data reference to the media stored in another file or elsewhere on a network. Quicktime is a closed source, propriety format that cannot be manipulated. It is considered suitable for editing
QUICK MASK MODE
A screen display mode in Photoshop in which a translucent coloured mask covers selected or unselected areas of an image.
RGB
The RGB color model is an additive colour model in which red, green and blue light are added together in various ways to reproduce a broad array of colours. The name of the model comes from the initials of the three additive primary colours, red, green, and blue.
The main purpose of the RGB colour model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. Before the electronic age, the RGB colour model already had a solid theory behind it, based in human perception of colours.
RGB is a device-dependent colour space: different devices detect or reproduce a given RGB value differently, since the colour elements (such as phosphors or dyes) and their response to the individual R, G, and B levels vary from manufacturer to manufacturer, or even in the same device over time. Thus an RGB value does not define the same colour across devices without some kind of colour management.
Typical RGB input devices are colour TV and video cameras, image scanners and digital cameras. Typical RGB output devices are TV sets of various technologies (CRT, LCD, plasma), computer and mbile phone displays, vide projectors, multicolour LED displays, and large screens.
RESOLUTION
Resolution is the number of pixels (individual points of colour) contained on a display monitor, expressed in terms of the number of pixels on the horizontal axis and the number on the vertical axis. The sharpness of the image on a display depends on the resolution and the size of the monitor. The same pixel resolution will be sharper on a smaller monitor and gradually lose sharpness on larger monitors because the same number of pixels are being spread out over a larger number of inches.
A given computer display system will have a maximum resolution that depends on its physical ability to focus light (in which case the physical dot size - the dot pitch - matches the pixel size) and usually several lesser resolutions. For example, a display system that supports a maximum resolution of 1280 by 1023 pixels may also support 1024 by 768, 800 by 600, and 640 by 480 resolutions. Note that on a given size monitor, the maximum resolution may offer a sharper image but be spread across a space too small to read well.
Display resolution is not measured in dots per inch as it usually is with printers. However, the resolution and the physical monitor size together do let you determine the pixels per inch. Typically, PC monitors have somewhere between 50 and 100 pixels per inch. For example, a 15-inch VGA monitor has a resolution of 640 pixels along a 12-inch horizontal line or about 53 pixels per inch. A smaller VGA display would have more pixels per inch.
RELATIVE AND ABSOLUTE URLS
A relative URL points to a file/directory in relation to the present file/directory. In most cases a relative link will only give the name of a file that’s in the same location as the file currently being edited.
An Absolute URL is independent or free from any relationship. When you use an absolute URL, you point directly to a file. Hence, an absolute URL specifies the exact location of a file/directory on the internet. It also follows that each absolute URL is unique, which means that if two URLs are identical, they point to the same file.
RASTOR GRAPHICS
There are two kinds of computer graphics - raster (composed of pixels) and vector (composed of paths). Raster images are more commonly called bitmap images.A bitmap image uses a grid of individual pixels where each pixel can be a different color or shade. Bitmaps are composed of pixels.Vector graphics use mathematical relationships between points and the paths connecting them to describe an image. Vector graphics are composed of paths.The image to the left below is representative of a bitmap and the image to the right is representative of a vector graphic. They are shown at four times actual size to exaggerate the fact that the edges of a bitmap become jagged as it is scaled up:
Bitmap Image: |
Vector Graphic: |
With Adobe® Systems’ introduction of the PostScript® page-description language computers could display fonts and images using point-to-point math rather than by pixels alone. The advantage to using a page-description language such as PostScript becomes clear when you scale an image up. The larger you display a bitmap, the more jagged it appears, while a vector image remains smooth at any size. That is why PostScript and TrueType® fonts always appear smooth - they are vector-based.The jagged appearance of bitmap images can be partially overcome with the use of “anti-aliasing”. Anti-aliasing is the application of subtle transitions in the pixels along the edges of images to minimize the jagged effect (below left). A scalable vector image will always appear smooth (below right):
Anti-Aliased Bitmap Image: |
Smooth Vector Image: |
Bitmap images require higher resolutions and anti-aliasing for a smooth appearance. Vector-based graphics on the other hand are mathematically described and appear smooth at any size or resolution.
Bitmaps are best used for photographs and images with subtle shading. Graphics best suited for the vector format are page layout, type, line art or illustrations.Wherever possible use the vector format for all your type, line art and illustrations and only use bitmaps for photos or images with complex or non-uniform shading. If the graphics application recognizes native vector files such as those created by Deneba Canvas™ (a filename with an extension of .CNV- for versions 6 and 7), Adobe Illustrator® (a filename with an extension of .AI), CorelDRAW® (a filename with an extension of .CDR), or Macromedia® FreeHand® (a filename with an extension of .FH8 - for version 8), then use them first.ROLLOVER BUTTON
In Rollovers, a button or image or image swaps itself for another image when the mouse rollsover it and reverts back to the original image on rolling out of the web object . The on-rollover images are preloaded into the page when it is loading, this ensures that the rollovers are displayed quickly.
RAM
Random Access Memory - computer memory that dynamically stores program and data values during operation and in which each byte of memory may be directly accessed.
ROOT FOLDER
The root folder of any partition is the “highest” folder in the hierarchy. The root folder contains all other folders and can also contain files. For example, the root folder of the main partition on your computer is probably C:\. The root folder of your DVD or CD drive might be D:\.
ROYALTY FREE WEBSITE
Websites where clip art, images, graphics, photographs, art, music and other created content is available to the public or individuals (normally for a specified amount of money) to be used in specified ways (terms of usage). The creator retains all copyrights and publishing rights. You may use and publish the clip art, images, music per the specified terms of usage but may not sell or distributed to a 3rd party. Royalty free packages, collections, images or photos are not public domain. The creator retains copyright and all terms of usage must be followed when using these royalty free packages, collections, images, photos, music, etc. e.g. A one-time fee or subscription give the right to use an image in a publication accroding to the terms agreed apon, with no license fees being paid for further use.