Front-to-back $${C}_{out}=\left(1-{\alpha}_{dest}\right)\bullet {C}_{source}+{C}_{dest}$$ Blends semitransparent layers from front to back. Also used for ray casting Direct volume rendering (DVR) for one channel
Back-to-front $${C}_{out}={\alpha}_{source}\bullet {C}_{source}+\left(1-{\alpha}_{source}\right)\bullet {C}_{dest}$$ Blends semitransparent layers from back to front Layered channel- intermixing mode
Addition $${C}_{out}={C}_{source}+{C}_{dest}$$ Sums input and existing intensity values Composite channel- intermixing mode;
Maximum intensity $${C}_{out}= MAX\left({C}_{source},{C}_{dest}\right)$$ Finds the maximum intensity value from the input and existing values MIP rendering for one channel
Multiplication $${C}_{out}={C}_{source}\bullet {C}_{dest}$$ Multiplies the intensity value of the input by the existing value. Also called modulation Shading and shadow effects
1. aIn the equations, $${C}_{out}$$, $${C}_{source}$$, and $${C}_{dest}$$ denote the output, input, and existing color values, respectively; $$\alpha$$ is the opacity value