width (0 is source width)

height (0 is source height)

play count (0 is forever)

captures per second. higher value is more accurate but takes longer, lower value is less accurate but is faster

fastest
0.25
0.5
1 (normal)
2
4
8
16
slowest
gif speed. lower numbers make gif faster, higher numbers make gif slower.

image quality

pixel sample interval (lower = more accurate)

none FloydSteinberg FalseFloydSteinberg Stucki Atkinson dithering method serpentine