Graphic Control Extension block, used for setting up disposal method, transparency, delay and user input.

userInput:Bool

Is image must wait for user input, before dispose? This flag may be used by user-defined program but absolutely ignored by any Gif players.

transparentIndex:Int

Index in color table that used as transparent.

hasTransparentColor:Bool

Is image have transparency?

disposalMethod:DisposalMethod

Disposal method of frame.

delay:Int

Delay, before next image appears. Delay is in centiseconds (1 centisecond = 1/100 seconds). Note: Some players (like FastStone) cut fraction of elapsed time when progressing to next frame which results in small timing error. Recommended to use time -= delay instead of time = 0.