what does "RGB" have to do with image files?
RBG or red blue green is the model in which these 3 colours are combined to reproduce other colours.
these 3 colours combined correctly along with brightness can reproduce any colour.
2) What is the difference between VECTOR and BITMAP graphics? Explain both terms
VECTOR: Vector graphics is the use of points, lines, curves and polygons. These are all based on mathmatical equations to represent images in computer graphics.
BITMAP: Bitmap is a type of memory organisation used to store image files. Now, along with Pixmap it commonly refers to the similar concept of a spatially mapped array of pixels.
the difference between the two is that one creates images based on a mathmatical equation using lines, curves etc, and Bitmap uses an array of pixels saved in a certain way to generate its image.
SOURCE: www.wikipedia.com
What is a pixel?
Pixel is short for picture element. it is essentially a dot which contains aa certain amount of red blue and green along with the amount of brightness that makes up an image.
source :
http://www.google.co.uk/search?hl=en&q=define%3A+pixel&btnG=Search&meta=
