Negative

These are all blending modes which seem to make the image go negative.

Additive Subtractive

Subtract the square root of the lower layer from the upper layer.

../../_images/Blending_modes_Additive_Subtractive_Sample_image_with_dots.png

Left: Normal. Right: Additive Subtractive.

Arcus Tangent

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.

../../_images/Blending_modes_Arcus_Tangent_Sample_image_with_dots.png

Left: Normal. Right: Arcus Tangent.

Difference

Checks per pixel of which layer the pixel-value is highest/lowest, and then subtracts the lower value from the higher-value.

../../_images/Blending_modes_Difference_Sample_image_with_dots.png

Left: Normal. Right: Difference.

Equivalence

Subtracts the underlying layer from the upper-layer. Then inverts that. Seems to produce the same result as Difference.

../../_images/Blending_modes_Equivalence_Sample_image_with_dots.png

Left: Normal. Right: Equivalence.

Exclusion

This multiplies the two layers, adds the source, and then subtracts the multiple of two layers twice.

../../_images/Blending_modes_Exclusion_Sample_image_with_dots.png

Left: Normal. Right: Exclusion.

Negation

The absolute of the 1.0f value subtracted by base subtracted by the blend layer. abs(1.0f - Base - Blend)

../../_images/Blending_modes_Negation_Sample_image_with_dots.png

Left: Normal. Right: Negation.