Photosounder Archive v1.1

// Hard limit the top layer to 1.0
New layer "Hard limit"
Operation invert
Blending minimum
Merge down layer

// Multiply the two layers, merge down
Blending multiplication
Selected layer -1
Duplicate layer
Selected layer +1
Merge down layer

// Duplicate above result, subtract from original and merge down
Duplicate layer
Selected layer -1
Blending subtraction
Merge down layer