Pixel and Resolution
Pixel is short for picture element, a pixel is a single point in a graphc image. Graphics monitors display pictures by dividing the display screen into thousands (or millions) of pixels, aranged in rows and columns. the pixels are so close to gether that they appear connected. In digital imaging, a pixel, is a physical point in a raster image, or the smallest addressable element in a 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.
Example of pixels. Shows a zoomed section of an image to demonstrate how it is made up of pixels.
Resoluion is oftern used for a pixel count in digital imaing, hight resolution mens more image detail.
Below is an illustration of how the same image might appear at different pixel resolutions, if the pixels were poorly rendered as sharp squares (normally, a smooth image reconstruction from pixels would be preferred, but for illustration of pixels, the sharp squares make the point better).
Vector and Raters Images
Raster images are based on pixels and this scale with loss of clarity, while vector-based images can be scaled without degrading quality because, vector graphics is based on images made up of paths, or strokes through control points, its these points that define the parameters such as, colour, shape, thickness and a fill.
File Formats and Uses
Bmp - Bitmap image file, used to store bitmap digital images.
Png - Portable network garphics, used as a bitmapped image format that uses lossless data compression, supports transparency.
Gif - Graphics interchange forma, bitmap image format, supports animations.
Tiff - Tagged image file format, file format for storing images.
Jpg/JPEG - Image file format, used for uts compression of images, also supports layered images.
Psd - Photoshop document, stores an image with support for most editing options in Photoshop.
Pdf - Portable document format, file format used to show document in software, hardware, and operating systems.
Eps - Encapsulated postcript, standard format for importing and exporting postscript language files.
Ai - Adobe illustrator artwork, proprietary file format, representing sing-pase vector based drawing.
Compression
Compression is where a file is reduced in bit size to help reduce resources usage, such as hard drive space. There is lossless compression (eliminates no needed data) and lossy compression (identifies marginally important information and removes it).
Image Capture Devices
Devices that capture images, such as, Ccamera's software that takes screenshorts of your computer screen, or simply a computer automatic print screen command on the keyboards.
Opimising
the process of modifying a software system to make some aspect of it work more efficiently or use fewer resources. In general, a computer program may be optimised so that it executes more rapidly, or is capable of operating with less memory storage or other resources.
Storage and Asset Management
Asset management refers to being in control of your digital files - renaming, backing up, grouping, archiving, maintaining, and exporting them to other formats.
