DiffImageOptions

Option	Type	Default	What it decides
tolerance	number	0.05	How different two pixels have to be, from 0 to 1, before it counts.
ignoreAntialiasing	boolean	true	Whether a pixel that only differs because an edge was drawn smooth is left out.
align	'none' | 'shift'	'none'	Whether an offset between the two is looked for first.
alignRadius	number	16	How far that search goes, in pixels.
blockSize	number	16	How coarse the grid is that changed pixels are grouped on.
maxRegions	number	200	The most regions to return. Past this the largest are kept.

DIFFINE_IMAGE_DEFAULTS is that table as an object.

Option	Type	Default	What it decides
tolerance	double	0.05	How different two pixels have to be, from 0 to 1, before it counts.
ignoreAntialiasing	bool	true	Whether a pixel that only differs because an edge was drawn smooth is left out.
align	DiffImageAlign	DiffImageAlign.none	Whether an offset between the two is looked for first.
alignRadius	int	16	How far that search goes, in pixels.
blockSize	int	16	How coarse the grid is that changed pixels are grouped on.
maxRegions	int	200	The most regions to return. Past this the largest are kept.

kDiffineImageDefaults is that table as a value.