Formats
Although they come in many forms, the most common type of image macro is a photograph with large text superimposed in Impact font, using all upper case letters and coloured white with a thin black outline. Exaggerated, intentional spelling errors are also used frequently for humorous effect.
One of the more famous image macros is "O RLY?" O RLY is often used on the internet as an abbreviation for the phrase "Oh, really?" Originally started with a snowy owl photograph (which is the classic O RLY image macro), it spread out over the Web quickly and was followed by other macros that convey a wide range of emotions. Another style of image macro that has amassed its own separate subculture is the "lolcat", an image combining a photograph of a cat with text intended to contribute humour. The text is often idiosyncratic and grammatically incorrect, and its use in this way is known as "lolspeak" or "kitty pidgin".
Read more about this topic: Image Macro