These are all blending modes which seem to make the image go negative.
Subtracts the square root of the lower layer from the upper layer.
Divides the lower layer by the top. Then divides this by Pi. Then uses that in an Arc tangent function, and multiplies it by two.
Checks per pixel of which layer the pixel-value is highest/lowest, and then subtracts the lower value from the higher-value.
Subtracts the underlying layer from the upper-layer. Then inverts that. Seems to produce the same result as Difference.
This multiplies the two layers, adds the source, and then subtracts the multiple of two layers twice.
The absolute of the 1.0f value subtracted by the base subtracted by the blend layer. abs(1.0f - Base - Blend)