One key element of a good website is having a good and appropriate layout including the correct usage of  images.  Whether images will be used for printing or for web design, the basic knowledge about images is very important.

What are the common image  file formats? 

JPEG (Joint Photographic Experts Group)  -  commonly used format for ordinary use

PNG    (Portable Network Graphics) – it supports true colors with (16million colors) which is  best for photographic images.  Some web browsers   do not support this format before, but the latest versions of Mozilla and Internet Explorers already supports PNG.

GIF    (Graphic Interchange Format)

TIFF   (Tagged Image file Format) - usually used in printing with better resolution, rarely used on web  since not all  web browsers supports this file format.

Definition of common graphic terms :

Pixel    A pixel is a tiny block of color and is a digital image's most basic building block.

Ppi       Pixel Per Inch   

Resolution  It can either refer to a screen resolution or image resolution. It is the over all size and quality of the image.

What is the importance of  image compression ?

Image file size is defined as the number of bytes of a file, the more pixels and pixel color depth consisting the file, the more larger file size is created.

 Image file size is a very important factor for storage purposes and for the web. Larger file size  images makes the website page loading slower  The goal of image compression   is  to reduce the file size correctly  without sacrificing the resolution of the image.

Short List of  Computer Graphic Softwares

Adobe Photoshop

Adobe InDesign

Adobe Illustrator

CorelDraw