// color.Palette is a concrete (slice) type.
	globalColorModel, backgroundIndex := color.Model(color.Palette(nil)), uint8(0)
	if useGlobalColorModel {
		globalColorModel, backgroundIndex = color.Palette(palette.WebSafe), uint8(1)
	}
	if go1Dot5Fields {
		g0.Disposal = make([]byte, len(g0.Image))
		for i := range g0.Disposal {
			g0.Disposal[i] = DisposalNone
		}
		g0.Config = image.Config{