Level 3 games designUnit 78 what is a pixel? Dean smith

What is a pixel 

A pixel is like a spot the start of a creation when you have more of them then you start to notice a shape of a characters or an object but there are times when you require a certain amount of them to make things stand out, the more pixels that are in the object the more the object will stand out
Here is an example

 Pixels: the picture to the left is 1080 pixel in height and 1920 in width when close up you can see the pixels is is blurry up close and on the right the image 2160 pixels in height and 3840 pixels in width double the pixels in the image to the left when up close you can see the pixels but it is much more cleaner and clearer 

Picture resolution: The number of pixels in an image is sometimes called the resolution, even though this is a bit of a misuse of the term. If we are using the term to describe pixel count, one convention is to express resolution as the width by the height, for example a monitor resolution of 1280×1024. This means there are 1280 pixels from one side to the other, and 1024 from top to bottom.

you can find the rest of this information Here> http://www.ultimate-photo-tips.com/what-is-a-pixel.html

the following website shows pixels in a camera it even explains Megapixels and colour information that can be seen in digital photography it even gives tips for photographers  

Types of Digital graphics
Raster Images (bmp, gif, tiff, jpg): what is a raster image
a raster image is where you COMPRESS an image into a file format where it would lose some of its quality if zoomed in you can see the pixels it is made from which make it blurred. the image on the left REPRESENT Raster as when up close its blurred.

bmp
The BMP file format or bitmap image file is a raster graphics image file format used to store bitmap digital images, independently of the display device (such as a graphics adapter)

GIF
A GIF is a lossless format for image files that supports both animated and static images

TIFF
TIFF or Tagged Image Format File is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and photographers

JPG
JPG is where an image in a computer is compressed into bytes and then reformed into a image

  
vector images (psd, wmf, fla, ai):what is a vector image

 a vector image is a digital graphic image that when zoomed in it will still be clear but this type of file format will take for room to process. the image on the right represent vector when UP CLOSE it still is quite clear 

PSD
PSD (photshop document) is the default format that Photoshop uses for saving data. then you can place layer over the image even if it has been saved. 

WMF 
WMF (windows meta file) is a 16-bit format that was originally designed for Microsoft windows.  WMF are intended to be portable between applications

FLA
FLA stand for Macromedia flash FLA files typically include vector image data for use i animations and have times lines to control the animation playback , audio and they may also include bit mapped video content

AI
adobe illustrator is a common uses for  file extension but is also quite popular for Graphic based drawing program but can be strictly limited.

"All information for raster and vector images came from google"

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