In digital imaging, a pixel, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen. The address of a pixel corresponds to its physical coordinates.
http://img2.wikia.nocookie.net/__cb20120828222220/fantendo/images/0/08/Pixel-mario.gif
Color Models
A color model is an orderly system for creating a whole range of colors from a small set of primary colors. There are two types of color models, those that are subtractive and those that are additive. Additive color models use light to display color while subtractive models use printing inks. Colors perceived in additive models are the result of transmitted light. Colors perceived in subtractive models are the result of reflected light.
The Two Most Common Color Models
There are several established color models used in computer graphics, but the two most common are the RGB model (Red-Green-Blue) for computer display and the CMYK model (Cyan-Magenta-Yellow-Black) for printing.
| RGB Color Model Additive color model For computer displays Uses light to display color Colors result from transmitted light Red+Green+Blue=White  | CMYK Color Model Subtractive color model For printed material Uses ink to display color Colors result from reflected light Cyan+Magenta+Yellow=Black  |
Notice the centers of the two color charts. In the RGB model, the convergence of the three primary additive colors produces white. In the CMYK model, the convergence of the three primary subtractive colors produces black.
In the RGB model notice that the overlapping of additive colors (red, green and blue) results in subtractive colors (cyan, magenta and yellow). In the CMYK model notice that the overlapping of subtractive colors (cyan, magenta and yellow) results in additive colors (red, green and blue).
The display resolution of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube (CRT), flat-panel display which includes liquid-crystal displays, or projection displays using fixed picture-element (pixel) arrays.
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It is usually quoted as width × height, with the units in pixels: for example, "1024 × 768" means the width is 1024 pixels and the height is 768 pixels. This example would normally be spoken as "ten twenty-four by seven sixty-eight" or "ten twenty-four by seven six eight".
http://www.techterms.com/definition/rastergraphic
Vector Images - File formats and uses
Unlike JPEGs, GIFs, and BMP images, vector graphics are not made up of a grid of pixels. Instead, vector graphics are comprised of paths, which are defined by a start and end point, along with other points, curves, and angles along the way. A path can be a line, a square, a triangle, or a curvy shape. These paths can be used to create simple drawings or complex diagrams. Paths are even used to define the characters of specific typefaces.
http://www.techterms.com/definition/vectorgraphic
Cross Platform Images - formats and uses
In computing, cross-platform, or multi-platform, is an attribute conferred to computer software or computing methods and concepts that are implemented and inter-operate on multiple computer platforms. The software and methods are also said to be platform independent. Cross-platform software may be divided into two types; one requires individual building or compilation for each platform that it supports, and the other one can be directly run on any platform without special preparation.
Compression
All lossless compression is based on the idea of breaking a file into a "smaller" form for transmission or storage and then putting it back together on the other end so it can be used again.
http://cf.ydcdn.net/1.0.1.23/images/computer/LOSSY.GIF
Lossy compression works very differently. These programs simply eliminate "unnecessary" bits of information, tailoring the file so that it is smaller. This type of compression is used a lot for reducing the file size of bitmap pictures, which tend to be fairly bulky.
http://computer.howstuffworks.com/file-compression3.htm
Example of Lossy Compression:
http://computer.howstuffworks.com/file-compression3.htm
Example of Lossy Compression:
Image Capture Devices - scanner, digital camera, tablet/smartphone
All image capture devices require a lens in order to work and capture images.
Digital Camera
Smartphone
Optimizing
For imagery, optimization involves choosing a suitable graphic compression format. Compression reduces the image filesize and consequently the time it takes to download and display in a browser. Common compression types include GIF, JPEG and PNG. Many compression formats reduce filesize by removing information from the image. For example, the JPEG format reduces overall tonal range to reduce filesize—reducing the tonal range means that highlights and shadows become less pronounced.
Storage and Asset Management
Digital asset management (DAM) consists of management tasks and decisions surrounding the ingestion, annotation, cataloging, storage, retrieval and distribution of digital assets.
Examples of Storage and Asset Management:
Flash Drive
http://s0.static.mymemory.co.uk/images/product_shots/large_42503_1365426250.jpg
CD's
http://www.rakyattimes.com/images/Personality/A/CDs.jpg
Cloud Save
http://www.tutorialspoint.com/shorttutorials/wp-content/uploads/2012/12/storage_img01.jpg
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