Image formats: GIF vs. JPG and when to use which

Common extensions for graphics are .gif and .jpg (sometimes .jpeg).
These file extensions represent the format of the graphic and are not interchangeable.
When saving a graphic it is important to save the graphic format best suited for your type of graphic.
 

	GIF		JPG
Good aspects	Use this format for cartoon style images and animations Works well with images using very few colors Can be made transparent, this will show the background of whatever window the image is in		Use JPG for photos and other images with similar need for detail Good for images which use many different colors Can be saved to a small file with loosing much qualitya
Drawbacks	fewer colors available Not good with photos or other detail intensive images Often has a larger file size		Does not work well with images containing large fields of color Cannot save animations Cannot be transparent (not good for buttons, bullets, etc. on websites)

OR

GIF

Use this format for cartoon style images and animations
Works well with images using very few colors

JPG

Use JPG for photos and other images with similar need for detail
Good for images which use many different colors
 

Display resolution for the web

72 dpi (dots per inch) is the maximum a screen can view

anything more than this is adding unnecessary size to your image,
increases the amount of time it takes to load the website it is on, and
does look any different to the person viewing the website.