HA2 Task 1 Glossary Of Terms

Heading 1 - Pixel and Resolution

Resolution is the detail in which a image has; either good or bad quality. in addition, higher resolution means a more detailed image. With resolution you can try and improve a images quality and with Resolution comes different types. Examples of this are
Pixel Resolution - this shows an image in different pixel resolutions e.g. 20 x 20, 5 x 5, 2 x 2.









Spatial Resolution - Refers to the umber of independent Pixel values per unit length. Basically, the measure of how closely lines can be resolved in an image is Spatial Resolution. Sometimes the more Pixels in an image can make a image look of more poorer quality.


Spectral Resolution - Images with color that distinguish light of different spectra. In contrast, multi-spectral images resolve even finer differences of spectrum or wavelength. Multis-pectral images have higher spectral resolution than just our ordinary color images.


Temporal Resolution - Filming cameras and even high speed cameras can view events at different times. Usually, the time resolution for movies for example is 24 to 48 frames per sec. However the high speed camera usually resolves at 50 to 300 frames per sec


Radiometric Resolution - This controls how finely a system can represent differences in intensity and this is usually expressed as a number of bits or levels. For example, 8 bits or 256 levels for computer image files.


http://en.wikipedia.org/wiki/Image_resolution


Pixels are a physical point in a raster image - in digital imaging. In comparison, a pixel targets a very small area in a image meaning that very careful adjustments can be made when doing really small and delicate improvements to an image. Here are 2 examples.



LCD pixels are usually in a 2D grid meaning that they are often represented using dots or squares. However, CRT pixels work from their timing mechanisms and sweep rates.


http://en.wikipedia.org/wiki/Pixel



Heading 2 - Vector and Raster Images


Raster images usually represent rectangular grids of pixels or points of color. Raster images are. Basically Raster allows you to look closely at a image to analyse it. Raster image is also known a Bitmap and is technically characterized by the width and height of the image in pixels and by the number of bits per pixel. Here is a example of a Raster Image.

Vector's - are based on paths or strokes which lead through locations e.g. locations of an image. These are known as control points. Each of the points also have a confirmed position on the X AND Y axis of the work plan. Each point will tell the user which way the Vector is pointing and the location of a point in the work space. All this defines the direction of the track. Lastly, each track can be assigned to a color a fill or even a shape or thickness. Here is a example of what it does.









File Formats And Uses.

A file format is a standard way that information is encoded for storage in a computer file. File formats can be used in many different ways when it comes to encoding for storage.  Examples of this are, 

Ogg -  is used as a container for different types of multimedia (video or audio)
Tiff -  is used for storing images (tagging image file format)
Psd - used for storing Photoshop file format work, images text.
Bmp - known as Bitmap file format is a raster image file format used to store Bitmap digital images. This is capable of storing 2d digital images even when resolution in a image has been hanged. Even when color is modified it still has the capability of storing a image.
Png - known as portable network graphics, is a raster graphic file format that supports lossless data compression.  This is most common compression file format  used to store lossless images from the internet.